GOLD STAR POWDERS - Siam · PDF fileGold Star Powders recommends two investments for the...

GOLD STAR POWDERS

Contents

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INVESTMENTPOWDERSContents

2 BRASS CASTING4 STAINLESS STEEL CASTING6 SILVER & GOLD CASTING8 HIGH-CARAT GOLD & MASTER MODEL CASTING10 BURNING OUT MASTER MODELS12 STONE IN PLACE CASTING14 PLATINUM CASTING16 ATOMIC 78 - Platinum, Palladium and Stainless Steel18 AEROSPACE INDUSTRIAL INVESTMENT POWDER20 BLOCK MOULDING POWDER - Turbo Wheels22 GLASS CASTING24 SHOE MOULDING26 SHELL MOULDING MATERIALS28 GOLD STAR WAXES30 FREEMAN WAX32 NATURAL & SILICONE RUBBERS34 DE-WAX & BURNOUT FURNACES36 VACUUM MIXING MACHINES38 VACUUM CASTING MACHINES40 CONSUMABLES42 IN-HOUSE CALCINING AND MILLING FACILITY44 GOLD STAR POWDERS UK46 SCP THAILAND48 GOLD STAR POWDERS CHINA50 GOLD STAR POWDERS INDIA52 GOLD STAR BRASIL 54 TROUBLESHOOTING56 PRODUCT SELECTION AND CARE57 BEST PRACTICE58 WORLDWIDE DISTRIBUTOR LIST

Goodwin PLC was established in 1883.The Goodwin Coat of Arms was awarded in 1983by The Chester Herald of Arms for Moulding andCasting of Metal for 100 years. In 1965, GoodwinPLC purchased 100% of the equity in a localrefractories manufacturing firm, now merged withGoodwin Refractory Services Ltd. Gold Star Powdersis a division of Goodwin Refractory Services Ltd.

The Birmingham Jewellery Quarterhas been described by English Heritageas a ‘National Treasure’... ‘A place ofunique character’... ‘A particularcombination of structures associated withjewellery and metal working that does notseem to exist anywhere else in the world’.For over 200 years, the BirminghamJewellery Quarter has been home tosome of the most highly skilledgoldsmiths and jewellery makers.

The Chamberlain Clock Tower (Joey),The Birmingham Jewellery Quarter.Erected in 1903.

Introduction and History

1

INVESTMENTPOWDERS

Gold Star Powders UK

Gold Star Powders India

Siam Casting Powders Thailand

Gold Star Powders China

Gold Star BrasilFor your local distributor details, see pages 58-60or visit www.goldstarpowders.com

Gold Star Powders (GSP), a division of Goodwin RefractoryServices Ltd, is part of the Goodwin PLC Group, who have over125 years of history in moulding and casting metal dating backto 1883.

Whilst the Gold Star Brand of investment powders and allproduct development originates from our ISO 9001 accreditedUK facility, it was considered that we could offer our customersa more competitive and dynamic service by setting up theoverseas manufacturing facilities.

GSP, with its sister companies, is now the largest manufacturerof Investment Casting Powder in the world, producing over30,000 tonnes worldwide per year; this equates to 1.5 millionsacks (22.7 kg) of Gold Star Powder. Our ability to compete isaided by our economies of scale and the fact that, within ourgroup of companies, we have our own silica deposits, andstate-of-the-art calcining facility, to manufacture our ownCristobalite. This vertical integration ensures a secure andcompetitive supply of the most important and expensivecomponent of investment powder.

GSP laboratories are continually investing the latest technologyavailable. GSP utilise particle size, thermal & setting expansion,X-Ray Fluorescence, X-Ray Diffraction, Permeability and SurfaceFinish Analysis to optimise products available to the industry.

GSP supplies consumable products to the jewellery andindustrial casting industry. Additionally, we now offer a fullrange of machinery used in the casting process, which ismanufactured competitively in India, to state-of-the-artEuropean designs, and performance to ISO 9001 Standards.

Brass Casting

Gold Star LC BrassGold Star LC Brass (LC stands for ‘low cost’) is an exceptionally competitive, plaster-bondedinvestment powder, specifically formulated by optimising the particle-size distribution andthermal expansion to help casters compete in the most demanding of casting environments.

The casting of Brass for the costume jewellery market accounts for a large percentage ofworldwide jewellery production, and is an area where costs must be minimised. Gold StarLC Brass helps achieve this but at the same time produces castings with excellent surfaces,therefore reducing metal loss and keeping finishing work, prior to plating, to an absoluteminimum.

Gold Star Low Cost Brass can also, under strictly adhered to conditions, successfully castsilver, producing good quality castings with smooth surface finish.

The cost of Low Cost Brass is at least 25% lower than a competitive, conventionalinvestment powder, although it is less abuse-resistant than other Gold Star products.

INVESTMENTPOWDERS

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• Do not cast with a flask temperaturelower than 650°C

• Slurry Temperature 21°C

• Leave for 90 min to stand before burnout

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MACHINE VACUUM MIXING Min.

Weigh out water & powder0

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Mix under vacuum

Stop mixer and scrape blades

Mix under vacuum

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HAND MIX THEN VACUUM 34:100

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WATER TO POWDER RATIO

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Vacuum flasks

Do not remove flasks from furnace to cast until they have been held at castingtemperature for a minimum of 1 hour. If held for less than 1 hour, the core of the flaskswill be at a much higher temperature than the digital temperature display states, andmay result in metal mould reaction.

Stainless Steel Casting

4

Stainless Steel has become an increasingly popular alloy withinthe jewellery industry. It allows for large, intricately designedjewellery to be cast at a reasonable price.

Phosphate-bonded investment powders set in an exothermicreaction. This means that heat is generated during the chemicalreaction taking place when the material sets. Heat acts as acatalyst to the reaction, therefore speeding up the setting timeand thus making the investment thicker. In order to achieveoptimum results it is very important that slurry temperature is

kept as low as possible and must be below 21°C / 70°F; thismay be done by using refrigerated water. In-line waterrefrigeration systems are readily available and relativelyinexpensive. Water temperatures as low as 3°C / 37°F can beused; at this temperature extended work times and a thinnerslurry will be experienced.

Phosphate bonded investment powders are less permeablethan gypsum bonded investment powders, therefore in orderto achieve a clean and complete burnout it is necessary that thetop burnout temperature of 900°C / 1650°F is reached toremove the entire carbon residue from the mould.

Recommended Grade of Stainless Steel

GSP has developed and produced at the Goodwin SteelCastings foundry, a specially formulated 316 stainless steel alloyespecially for the jewellery casting market. The alloy JC-316 S/Shas excellent flow properties providing complete fill of finedetail and oxide-free castings.

INVESTMENTPOWDERS

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Vacuum flasks

WATER : POWDER 32:100


Add powder to water

Mix under vacuum

Pour flasks

Vacuum flasks

Right: Award rings courtesy of Commentative Brands Inc.

Gold Star Powders JC-316 S/S Alloy

• DO NOT STEAM DE-WAX

MACHINE VACUUM MIXING Min. HAND MIX THEN VACUUM Min.


HT

HT has been specifically formulated with a fine particle size

investment powder that is used with the conventional rubberbase and flask system. The flask base can be stripped 90 minutes

distribution and a high fired strength. HT is a phosphate-bonded

after investing when the mould has set and achieved full green strength.

where the vast majority of the investment will be removed bythe thermal shock, minimising the remainder of the cleaning.

After casting, the flask can be quenched in a water bath whereHT must not be steam de-waxed as it will break down the mould.

Silver and Gold Casting

6

Gold Star XL Gold Star XL has been our greatest volume investment powder overthe last decade, with a proven track record of success. XL will meet thedemands of casting Silver and Yellow Gold up to 18ct.

Gold Star XXX We are always seeking to improve upon our products; we werecontinually being asked for a cost effective quality investmentpowder which will cast both Yellow and White Gold alloys up to18ct. Our Research and Development Team, supported by our ownCalcining and Milling Facility, introduced Gold Star XXX which filledthe prescription perfectly.

INVESTMENTPOWDERS

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500/HR

Time in Hours

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y

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250/

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500/HR

250/

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Rapid

500/HR

Lower to Casting Temp.Extra Fast

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• Use de-ionised water

• Weigh water and powder

• Slurry temperature 21°C


Above: Maria de Toni ’Gold Expressions 2008’courtesy of the World Gold Council.

www.gold.org

Opposite: A Solid Silver crocodile made in Zimbabwe by Patrick Mavros. It has beenhand carved, vulcanised in natural rubber, wax injected and cast in solid silver.


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38:100

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Remove tape from flasks after


HAND MIX THEN VACUUM



Gold Star Powders has travelled the world to source the highestquality, pure raw materials and additions, to ensure premierperforming consistent products are produced. Both Gold Star XLand XXX benefit from the high quality cristobalite that is tailoredto our exact specification and manufactured at our sistercompany’s calcining and grading division in Derbyshire, England.Gold Star Powders recommends two investments for the castingof all Silver and Gold alloys both yellow and white up to 18ct,with the exception of Palladium White Gold (see Omega+ forPalladium White Gold Casting - page 8).

Each of these competitively priced products produces excellentsurface finish, a strong mould, and “cleans off” the casting easily.They are both suited to centrifugal and vacuum assisted castingmethods, and, where vacuum flasks are used, a fast burnout cyclecan be used.


High-Carat Gold & Master Models

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+

+

demanding situations, producing excellent results even at themost extreme temperatures. Omega+ has optimised thermalexpansions, permeability and particle size distribution to enableit to produce the highest quality castings and reproduction ofMaster Models. Omega+ has the highest content of un-mineralised Cristobalite in the GSP range. A grade ofCristobalite is specifically manufactured for Omega+ at oursister company’s calcining and grinding facility, which ensuresthat the exact particle size grading required is achieved.

Omega+ is suitable for all Yellow and White Golds includingHigh Percentage Palladium White Gold.

Omega+ has been designed for the application of MasterModel casting and has been tested with a cross-section of SLAResins, Carving Waxes and Machined Waxes. Omega+

produces excellent results with smooth surfaces when used tocast with models from companies such as Envisiontec, 3DSystems, Invision and Solid Scape.

The application of Omega+ determines which burnout cycleshould be used. If standard Jewellery injection wax is beingcast then the burnout cycle below for Injection Wax is to beutilised. If SLA Resins, Machined Waxes or Carving waxes arebeing cast the burnout cycle for Master Models on page 10 isto be utilised in order to achieve optimum results.

INVESTMENTPOWDERS

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500/HR

250/

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Rapid

500/HR

Lower to Casting Temp.Extra Fast

0

210

390

570

750

930

1110

1290

1470

• Use de-ionised water

• Weigh water and powder

• Slurry temperature 21°C



1

0.5

3.5

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1

8Total time taken

Add powder to water

Mix under vacuum


Mix under vacuum

Pour flasks

Vacuum flasks


38:100

0

1

3

1

1

28

90

Total time taken


Add powder to water

Mix by hand

Mix with machine

Vacuum mixer bowl

Pour flasks

Vacuum flasks


Top Right: 18ct White Gold Ring with Tanzanite, cast by Hean Studio Ltd. Designed by and courtesy of Shaun Leane.

Opposite: ‘Only Gold is Radiant’, courtesy of the World Gold Council. – www.gold.org





See page 10 for burnout cycle for SLA Resins, Machined Waxes or Carving waxes

Do not remove flasks from furnace to cast until they have been held at casting temperature for aminimum of 1 hour. If held for less than 1 hour, the core of the flasks will be at a much highertemperature than the digital temperature display states, and may result in metal mould reaction.

OmegaOmega has been formulated to deal with the most

38:100

Master Model ManufactureOmega+ for Resin Wax Casting

10

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F

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Do not remove flasks from furnace to cast until they have beenheld at the correct casting temperature for a minimum of 1 hour.If held for less than 1 hour, the core of the flasks will be at a muchhigher temperature than the digital temperature display states.

Master ModelsThe number of S.L.A. (Stereolithography), Machined andCarved Master Models being produced continues to increase.Gold Star Omega+ is a new investment powder able towithstand the challenges of pattern expansion, and higher thanusual burnout temperatures, to remove all of the carbonresidues.

Tests using patterns produced by a number of differentcompanies including Evisiontec, 3D Systems, Solid Scape andInvision, cast using Omega+ have seen exceptional qualitycastings in terms of surface finish and faithful reproduction ofthe finest detail.

The Burnout Process

To achieve the optimum casting results, having taken care ofyour Master Models, it is also important to follow thesuggested burnout cycle detailed below. This cycle has beentested in the Gold Star laboratories and will help produceoptimum results. It is suggested that furnaces are calibrated fortemperature control regularly.

Taking Care of Master Models

There are some important rules to follow when producingMaster Models for casting and these should be followed so thatthe best quality casting is achieved.

• Waxes and Resins should be stored at the correcttemperature as suggested by the supplier.

• After production, resin patterns should be cleaned andallowed to dry before being stored in an airtight containerwith a silicon absorbtion pad.

• The patterns should then be placed into a sealed containerwith a silicon gel bag.

• Patterns must not be taken out of the sealed container orexcessively handled until ready for spruing.

Stone in Place Casting

Gem Set holds the stones in place during the de-wax period, and protects them from the heatduring the remainder of the burnout process, andthe molten metal when cast. Gem Set will producehigh definition, clean surface castings, with stonesthat remain as clear as they were before burnout.

Extensive permeability testing and developmenthas taken place to ensure maximum carbon isreleased from the mould during burnout. It isformulated with the special additives to enhancestone-in-place casting results and improve clean-off. Gem Set will cast all alloys melting below1250°C.

INVESTMENTPOWDERS

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• Do not burnout above 630°C

• Do not quench, only knock out when cold

12 Opposite: Photograph supplied courtesy of Indutherm;casting by Pusch Co., Pforzheim.

Items supplied courtesy of L. Wooley, Hockley, Birmingham.


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38:100

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Mix by hand

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Vacuum mixer bowl

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Vacuum flasks






Do not remove flasks from furnace to cast until they have been held at casting temperature for aminimum of 1 hour. If held for less than 1 hour, the core of the flasks will be at a much highertemperature than the digital temperature display states, and may result in metal mould reaction.

Maximum burnout temp.

Gem SetGem Set has been specially formulated to protectprecious stones such as diamonds, when they are setinto the wax patterns, burned out and cast , to ensureno damage to the stones during the burn out cycle.

burnout cycle MUST not exceed 630°C.The maximum temperature achieved during the

38:100

Platinum CastingPhosphate-Bonded Investment Powder

14

Platin CastThe extreme melting point of Platinum of up to 2000°C requires a speciallyformulated Investment Powder to cope with the intense casting conditions.Platin Cast is a water-based Phosphate-bonded Investment Powder, whichhas been successfully used for the casting of Platinum alloy for many years.

Traditional Platinum casting investments use a 2-part acid-bonded chemicalreaction to attain mould strength at an elevated temperature, whereas PlatinCast utilises a water-based, phosphate-bonded chemical system and sets inan exothermic reaction at room temperature.

The mixing process is similar to a plaster-bonded investment such as Omega,where the powder is added to the water in a mixing bowl, mixed for thecorrect length of time, vacuumed in the bowl and then poured into the flask,vacuuming once again.

After investing, the mould is allowed to bench-set for two hours, by whichtime it has set and the rubber base can be removed and the mould placedinto the furnace.

INVESTMENTPOWDERS

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Platinum tree supplied courtesy of Hean Studio Ltd, England.Platinum pendant and chain inset with diamonds.

Opposite: White Gold wedding bands inset with diamonds.

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Pour flasks

Vacuum flasks

WATER : POWDER 32:100


Add powder to water

Mix under vacuum

Pour flasks

Vacuum flasks


MACHINE VACUUM MIXING Min. HAND MIX THEN VACUUM Min.

Do not remove flasks from furnace to cast until they have been held at casting temperature fora minimum of 1 hour. If held for less than 1 hour, the core of the flasks will be at a much highertemperature than the digital temperature display states, and may result in metal mould reaction.

Atomic 78 - PlatinumAcid Bonded Investment Powder

16

Atomic 78 uses advanced Acid Bonded chemistry to producerevolutionary results for the Platinum and Palladium castingindustry. This powder is not mixed with diluted acid, becausethe acid binder has been included into the powder formulation,therefore making it an ‘Add water only’ investment. Thisensures that the acid concentration in the investment isconsistently at the correct level, and removes the necessity ofhaving liquid acids in the workplace.

GSP have developed a mould drying system as illustrated(patent pending), whereby a rubber base with a disposabledrying cartridge is used to extract the water from the flask, andno longer requires a bed of drying media. Therefore there is noneed for the wax tree to be fixed to a card base, or for a paperliner inside the flask. However, if the caster prefers to use thetraditional method of waxing, Atomic 78 is very versatile andcan be used for this method too.

After investing, the flask should be bench set for three hours.In that time the mould will set hard and will be ready to beplaced into the furnace; this is not the case with mostconventional 2-part investments.

Atomic 78’s clean-off after casting is equally ground-breaking, and can be seen by visiting the web sitewww.atomicpowder.com. The mould can be quenched in abath of water, 10 minutes after casting; the quench is quiteviolent and noisy. The casting is ejected from the mould,leaving very little additional cleaning necessary: another time-saving advantage to using this product when compared totraditional 2-part investments.

Atomic 78 can also be used to cast other high melting-temperature alloys such as Chrome Cobalt and Stainless Steel.Note: The maximum flask size that can be used is 4” x 4”.

INVESTMENTPOWDERS

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www.atomicpowder.comFor mixing instructions, video user guide and more information see website.

1 - Disposable Drying Carton

2 - Atomic Rubber Base

3 - Atomic Flask

1 12

3

Atomic 78 blowing off investment from casting.

The maximum flask size that can be used is 4” x 4”.

Aerospace Industrial Investment Powder

18

Goodwin Refractory Services is one of the world’s largestmanufacturers of Industrial Investment Powder for theAerospace, Automotive, Rapid Prototyping and other Industrialapplications.

In conjunction with our customers, over many years, we havedeveloped a versatile range of investments to suit allapplications. These can be tailored to an individual foundry’sspecification, producing an investment powder which will copewith the most demanding of tolerances.

GRS has the ability to carry out manufacturing trials at our UKfacility, to offer our technical consultancy service and helpimprove the quality of the castings and manufacturingefficiency.

GRS Industrial Investment Powders are used to manufactureparts for use by such world-renowned names as Boeing andAirbus from the Aerospace Industry; and Ferrari Formula 1,B.M.W. Mercedes and Volkswagen Audi from the AutomotiveIndustry.

M028This is our most popular Industrial Investment and wasformulated in our laboratory for the production of highaccuracy, thin-walled Aluminium castings and other lowtemperature, non-ferrous alloys for the aerospace industry.

M356This has been developed for thin-walled castings, in particularthose containing vented channels where the inner wall integrityis vital, and the ease of removal of the investment after castingis essential; this may often be required when casting militaryparts, for example in the new Eurofighter aircraft.

INVESTMENTPOWDERS

Opposite: Eurofighter Typhoon – The Eurofighter is a twin-engine, multi-role strike fighter aircraft that is unique in modern combat aircrafts in that there are four separate assembly lines. BAE Systems are oneof the four partners that design and manufacture the Eurofighter Typhoon and, as such, British Aereospace Systems stand out as one of the largest and most highly innovative UK industrial manufacturers.

Block Moulding Investment PowderTurbo Wheels

20

Goodwin Refractory Services is one of the world’s largestmanufacturers of Block Moulding Industrial Investment Powderdesigned specifically for vacuum casting aluminium and otherlow temperature, non-ferrous metals.

In recent years, the automotive industry sector has grownsignificantly and the manufacture of turbo charger wheels hasbecome an industry in its own right as all engine manufacturerslook for increases in power and efficiency of their latest designs.Modern turbo chargers help improve fuel efficiency, economyand power, and reduce emissions throughout the operatingrange.

As this exciting technology has spread to more and moreapplications, the technology for manufacture has become moresophisticated.

Goodwin Refractory Services is a leading supplier of BlockMoulding Investment Powders, and we have worked toprovide the industry with the highest level of dimensionalaccuracy and to produce faultless castings that requireminimum finishing.

M391 is specifically designed for use with silicone rubbermoulds, and contains special additives which facilitate theremoval of the master without detrimental effect on the surfaceof the plaster mould. These systems are typically used withoutflasks and it is not advisable to use them with metals whichmelt above 1100°C.

The product can be tailor-made to suit your own processingsystem and manufacturing requirements.

Goodwin Refractory Services offers a worldwide TechnicalConsultancy service to help you maximise throughput andefficiency in investing and casting. Please contact Gold StarPowders UK.

INVESTMENTPOWDERS

BBuuggaattttii VVeeyyrroonn 1166..44

The Bugatti Veyron 16.4 is a mid-enginesports car produced by Volkswagen AG. It isthe quickest accelerating and deceleratingstreet-legal production car in the world.Powered by a 1,001PS (987hp/736kW)W16 engine, it is able to achieve an averagetop speed of 253.81mph and0-60mph in 2.9 seconds. It is named afterFrench racing driver Pierre Veyron, who wonthe 24 hours of Le Mans in 1939 while racingfor the original Bugatti team.

Turbo Charger Wheels.

Bugatti Veyron W16 engine.

Glass Casting

22

INVESTMENTPOWDERS

Glass “Free Set” on Mould. Glass in ceramic feeder on Mould.

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S S

Gold Star CrystalcastGold Star Crystalcast is a plaster-bonded investment powder specificallydesigned for casting glass. The refractory content and permeability ofCrystalcast enables firing cycles to temperatures as high as 900°C for as longas 10 days depending on the mould size.

To enable the removal of filigree work from the mould without breakage andfor ease of use, Crystalcast has been designed to have high strength duringfiring, yet removal from the cast item when cool is very easily achieved,limiting any chance of damage.

Crystalcast has been formulated with a high-technology particle sizedistribution ensuring that every detail of the mould is reproduced with anexceptional surface finish. Gold Star has optimised the strength of thisinvestment powder so that it permits the casting of small or large sculptures.

Crystalcast is mixed using the same method as a standard plaster-bondedinvestment, with a water to powder ratio of 32:100. After the mould has curedfor a minimum of three hours, the pattern is then removed by the steamde-wax process. This process can take up to 4 hours but is dependent onmould size. Care must be taken not to steam de-wax the mould for too longas it can cause damage to the mould surface.

The de-waxed mould filled with glass crystals is placed in a cold oven and firedas per graph. The furnace should be ramped up at no greater than 50°C perhour until a temperature of 850°C is achieved, this temperature is to be heldfor around 30 hours; the length of time is dependant on its size. When theglass becomes molten it flows under gravity into the voids of the mouldcompleting the casting process.

The mould must be cooled in the furnace at a rate of no greater than 10°C perhour to ambient temperature. At this point the casting can be gently removed;never quench glass or crystal castings.

Opposite: Après l' Amouramber and sea green crystal,oeuvre d'Art signed by Daum and Sylvie Mangaud Lasseigne,limited edition to 375 pieces.

Shoe Moulding

24

Gold Star Shoe CastGold Star Shoe Cast is specifically designed for the manufactureof aluminium shoe mould plates for the production of shoesoles. This method of manufacture is used to produce soles formany of the leading names in the training shoe industry.

A typical master shoe model is constructed from wood, metal,or plastic. Silicone is then poured over the master model andleft to cure. Once set, the Silicone mould is stripped from themaster, Gold Star Shoe Cast slurry is poured into it and allowedto set.

The Gold Star Shoe Cast plaster model is removed from thesilicone mould and dried out in the furnace. The plaster modelis then set into a frame and molten aluminium is poured overit, the metal is left to cool and the plaster is removed from thealuminium casting.

Mixing Instructions

Shoe cast is to be mixed at a recommended slurry temperatureof 21°C, adjust the water temperature to achieve this.

Add the powder to the water at a ratio of 40:100 and mix for4 minutes, vacuum the mixing bowl for 1 minute and pouraround the pattern. Vacuum for a further 1 minute and thentop off the pattern frame. To aid the removal of airbubbles gently vibrate during vacuuming. Total work time is10 minutes.

The mould must be allowed to set for a minimum of 2 hoursbefore being loaded into a drying oven at ambienttemperature. The drying oven is to be ramped up to atemperature of 280°C at a rate of no greater than 100°C perhour. The mould must be held at 280°C for between 5 and12 hours depending upon its size.

Once the cycle is complete, the drying oven may be switchedoff and allowed to cool to ambient temperature. The moultenmetal may then be cast into the mould and allowed to cool, atwhich point the plaster is removed.

INVESTMENTPOWDERS

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Refractory Products Mullite 55 is a high Alumina content refractory material for theback-up Slurry and Stucco.

Zirconium Silicate High purity sands are used for the specialistmanufacture of Precision Casting grade materials for primarySlurries and Stuccos.

Fused Silica High purity Amorphous Silica is used tomanufacture all grades suitable for both Slurry and Stuccoapplications.

Repair Products Rhoseal is designed for shell repair in Aerospace applicationswhere high purity is a prerequisite.

Silroc is for all commercial shell repair applications.

REFRACTORY PRODUCTSPrimary Slurry Typical Grades Mean Size Uses

Primary Slurry additionZirconium

200’s90% < 50 for Aerospace

Silicate Flours Microns and commercialapplications

Primary Stucco forZirconium

M17090% <180 Aerospace

Silicate Sand Microns and commercialapplications

Back-up SlurryMullite 55

200’s80% < 45 addition for

Flour Micron Aerospace andcommercial applications

Mullite 5516-30’s 1.0 to 0.5mm Back-up Stucco addition

Stuccos30-80’s 0.5 to 0.18mm for Aerospace and 50-80’s 0.3 to 0.18mm commercial applications

Fused Silica 90% < 75Primary Slurry addition

Flour200’S

Micronsfor Aerospace and

commercial applications

Fused Silica 50/100 0.3 to 0.15mmBack up Stucco addition

Stuccos 10/20 1.7 to 0.85mmfor Aerospace and

commercial applications

SHELL REPAIR PRODUCTS Repair Iron Lead BismuthProduct Content Content Content

Uses

RHOSEAL < 1500ppm < 50ppm < 1ppmHigh purity Aerospace

All forms ofSILROC 0 – 1.5% 0.009% N.A. commercial

casting

Goodwin Refractory Services aims to establish and maintain long-term relationships with our Precision Casting customers, helping themmeet the demands and challenges in a growing industry.

We process and quality check, at our fully automated facilities in the United Kingdom, the highest quality materials in order to meetthe most exacting and demanding challenges of the industry.

Key products of the GRS include refractories for addition to the binder, refractory stuccos for the building process of the shell, and high-technology shell repair materials.

Slurry coating shell mould. Stucco coating shell mould in rain chamber.

Opposite: Molten metal being poured in to shellmoulds for the aerospace industry.

Draining of primary slurry prior to stucco coating.

(Photos supplied courtesy of MK Technology).

Gold Star Waxes

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Gold Star’s development programme is specifically targeted atproducing the best and most economic range of injection waxes.

Formulated by its own research and development team, these highquality waxes offer world-beating value for performance. Thewaxes have been developed primarily for jewellery applications,providing excellent reproduction of detail.

These waxes are manufactured under strict quality controlconditions, and are marketed exclusively through Gold Star’snetwork of distributors.

GS Wax 110A quality wax, particularly suitable for injection forming of detailedand filigree wax patterns. Produced in conventional bead form.

GS Wax 120A premium grade injection wax, which is designed to be used at atemperature of 70°C with excellent flow characteristics – allowinga wide range of components to be made, including stone in placeand the finest filigree patterns.

GS Wax 125Developed primarily for filigree type application, but is equallysuitable for other demanding work. It has excellent flowcharacteristics and is designed to be used at temperatures of67º-70ºC.

GS Wax 130Designed for all jewellery applications, and is particularly suitablewhere thick and thin sections can occur, such as signet rings andcoin mounts. It gives an opaque, chalky appearance when set, toenable the inspection of fine detail prior to investment. This wax isquick setting and will give to minimal pattern shrinkage; anexcellent, all-purpose choice.

GS Wax 140Particularly suitable for patterns with larger flat surfaces. Its quicksetting properties and hardness reduce shrinkage to a minimum.An injection temperature of at least 70ºC is suggested.

GS Wax 210Specifically developed for both injection and also the pouringtechnique; used for small and large statues. Available inconventional bead form.

GS Wax 310Is very suitable for the production of large patterns including beltbuckles. It has excellent flow properties, extremely low shrinkage.

GS Wax 320This product is supplied in Aqua colour to allow for better detailrecognition on the patterns. The wax is designed to produce awide range of components including fine filigree, and has speedysolidification characteristics, giving minimum shrinkage.

Congealing Injection Penetration Flexibility TypicalSpecifications Point °C Temp °C IP49 1-10 Viscosity Colour

dmm@25 cPs@70°C

GS Wax 110 62 70 7 4 265 AquaGS Wax 120 65 70 8 5 275 BlueGS Wax 125 60 67-70 8 5 263 PinkGS Wax 130 64 68-70 6-7 3 220 GreenGS Wax 140 64 70 6 3 430 AquaGS Wax 210 65 70 7 4 345 BlueGS Wax 310 65 71 6 4 345 RedGS Wax 320 65 71 6 5 263 Aqua

Opposite: African Silver bangles courtesy of Patrick Mavros.

Freeman Wax

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Gold Star can offer a comprehensive range of Freeman products including Flakes PremiumInjection Waxes, Ring Tubes and Carving Blocks.

For over 30 years, Freeman Injection Wax has been the industry standard for quality andconsistency. Its formulations are renowned for their high pattern detail, rapid waxsolidification, minimal shrinkage, excellent flow and low ash content (.003%), enabling thecleanest burnouts and most accurate reproductions possible. All are designed for Platinum,Gold, and Silver, as well as industrial and dental alloys.

Flow Flexibility Carvability Shrinkage Memory Pattern Shelf Life Readability Solidification

Aqua High Medium Low Low Medium High High Medium

Turquoise High Medium Low Low Medium High High Medium

Ruby Red High Medium Low Low Medium High High Medium

Tuf Guy Green Medium High Medium Low Medium High High Medium

Filigree Pink Medium Medium Low Low Medium High Medium Medium

Super Pink High Low Medium Low Low Medium High Fast

Flexible Blue Medium Highest Medium Medium High Highest Medium Medium

Carvable Purple High High High Low Medium High High Fast

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Freeman Flakes Comparision ChartFreeman Ring Tubes

Available in Green & Blue.Freeman Blocks & Slices

Available in Green, Blue and Dark Green.

Freeman Wax

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Aqua Flakes Injection Temp: 65ºC / 150ºF

This all-purpose injection wax is Freeman’s most popular formulation,as it provides the ideal balance of characteristics demanded by mostdesigners and casters. Also recommended for stone in place casting.

Turquoise Flakes Injection Temp: 65ºC / 150ºF

Similar to Freeman’s Aqua Flakes, except for the turquoise colour.Many designers and casters prefer the darker colour for easier visualverification of fine detail.

Ruby Red Flakes Injection Temp: 65ºC / 150ºF

Similar to Freeman’s Aqua Flakes, except for the deep-red colour.Many designers and casters prefer the darker colour for easier visualverification of fine detail.

Tuf Guy Green Flakes Injection Temp: 73ºC / 165ºF

This is the toughest wax of the Freeman Flakes line. Its accuracy anddurable, yet flexible, characteristics make it ideal for large pieces.

Filigree Pink Flakes Injection Temp: 68ºC / 155ºF

This wax combines the flexibility of Tuf Guy Green with the excellentflow characteristics of Aqua flakes, producing very high detail whileenabling easy pattern removal without breakage. Recommended forstone in place casting.

Super Pink Flakes Injection Temp: 65ºC / 150ºF

Featuring the quickest solidification, this wax will not give, making itideal for clasps, claws, and bezel settings. Also, the opacity makes thiswax superior in readability.

Flexible Blue Flakes Injection Temp: 68ºC / 155ºF

Featuring the longest shelf-life and highest flexibility of the FreemanFlakes line, this unique mixture of wax and plastic is especially well-suited for metal moulds and stone in place casting.

Carvable Purple Injection Temp: 77ºC / 170ºF

Developed for designers and casters who often rework wax patterns,this wax offers superior carvability with minimal filling or clogging oftools. Also, with the highest injection temperatures of the FreemanFlakes line, it will not break under stress and enables easier handling.

Gold StarNatural & Silicone Rubbers

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As part of the range of accessories required by the jewellerycasting industry, Gold Star offers a range of high-quality mouldrubbers. Due to precise requirements, continuous productresearch is being carried out to ensure Gold Star offer the verybest mould rubbers to its customers.

A key component in the manufacture of cast jewellery isinjection mould rubber; typically, the rubber will either be aNatural Gum or Silicone.

Gold Star offers an excellent Natural mould rubber calledFormula 8. This product is formulated in the United States ofAmerica and has all of the attributes required in today’s waxroom, including excellent memory, super high-tensile strength,and the ability to produce exact fineness of detail. Formula 8 isproduced in both 22.7 kilo rolls and 10 kilo boxes of strips.

We also have Silicone rubber in both a liquid two-part andputty form, these are both easy to work and cut, require norelease spray and provide high shine finish to the patterns.

Silicone Moulding rubbers are synthetic rubber compoundsespecially designed for use in the lost wax casting method ofmaking precious metal jewellery. Gold Star produces 3 types ofsilicone putty for wax injection of jewellery.

PUTTY HARDNESS

ADVANCE 35+ -5 Shore A hardness, Yellow

AQUA 40+ -5 Shore A hardness,Light Green

MASTER 45+ -5 Shore A hardness, Blue

Opposite: Natural rubber mould with wax models.

De-wax and Burnout Furnaces

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Today’s casting industry, whether it be jewellery or industrial, is constantly developing anddemanding more from its equipment suppliers. GSP has, for many years, recognised this fact andhas developed not only a range of modern, electric, energy-efficient furnaces for the jewelleryindustry, but has also worked with customers in both sectors to create bespoke furnaces for theirspecific applications. We are proud to advise that whether you require a static, rotary or bespokesized furnace, we at GSP provide the expertise and after-sales service you require in this field.

The burnout process is one of the key elements in achieving good-quality castings. GSP hasmanufactured in the UK our own high quality multi-step Digital Temperature Controller (GSP-DTC6) to ISO9001 standards. All Gold Star furnaces are supplied fitted with a GSP-DTC6controller as standard; the GSP-DTC6 can be also purchased separately. For GSP-DTC6 user guidesee page 57.

Gold Star furnaces ensure complete burnout occurs, preventing cool areas which will giveincomplete burnout with carbon residues, and will adversely affect the quality of the final casting.

Gold Star furnaces are all delivered complete with a digital controller that has 9 individualprograms. These digital controllers are available to purchase as a stand-alone unit, to retrofit toyour existing furnace – see page 57.

Our most recent addition is a rotary burnout furnace which has an odour diffuser attached, whichneutralises the gases emitted during the process. All Gold Star furnaces are manufactured fromstainless steel, and are specifically designed to perform excellently for the jewellery casting process.

SPECIFICATIONS GS12 GS40T ROTARY 35J SPECIALS

Flask Capacity 8 27 20(6” x 4” Flange Type)

Width: Internal: 340mm 410mm 490mmExternal: 550mm 730mm 868mm

Depth: Internal: 340mm 640mm 520mmExternal: 700mm 1030mm 720mm

Height: Internal: 340mm 440mm 860mmExternal: 700mm 1620mm 2010mm

Weight: 98kg 276kg 295kgGS40T

Opposite: Special commission photo taken with kind permission of Sellex S&AS.

Specificallydesignedto customers’requirements.

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GS40T ROTARY 35J SPECIAL COMMISSIONSELEX S&AS(Formerly British Aerospace Systems)

Vacuum Mixing Machines

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The mixing of the Investment Powder is vitally important toproducing a quality casting, free of bubbles and blemishes,both of which are difficult to remove.

Gold Star Maxivac Vacuum Mixing Machines provideconsistent mixing, leading to a superior surface finish, totalelimination of air bubbles and highly accurate pouring,ensuring no wax breakage.

Gold Star’s Maxivac 17 and 35 vacuum mixing machines arespecified to the exacting conditions required for optimumresults of the Investment Powder. The vacuum mixers do thisby improving the consistency and quality of the mixed slurrythrough the reduction of air entrapment, and wetting of thepowder during the mixing and pouring process.

Gold Star is a fundamental supplier/partner within manyindustries, from jewellery and aerospace, through toautomotive prototype production (for Ford, Mercedes, Ferrari).It plays a vital role in the production of quality industrialcastings. Production of these intrinsically complex pieces ofmachinery means that having superlative industrial castings isessential, and Gold Star provides this.

Illustrated in the far-right picture is the large mixing machineused by Selex S&AS (formerly BAE Systems Portsmouth).The large vacuum mixer was designed by GSP specifically forSelex S&AS.

Selex S&AS is a global company engaged in the development,delivery and support of advanced defence and aerospacesystems in the air, on land and at sea.

SPECIFICATIONS MAXIVAC 17 MAXIVAC 35 Special Commissions

Width (*With control box at maximum outward reach) 620 (*900)mm 1100 (*1430)mm

Depth 680mm 730mm

Height 1410mm 1660mm

VACUUM FLASK CHAMBER

Diameter 355mm 550mm

Depth 240mm 530mm

Maximum height of flask which can be invested 9”/ 230mm 12”/ 305mm

CAPACITY

Maximum weight of powder 12kg 25kg

Number of 6” x 4” flasks (Flange type) 6 12

Specificallydesigned tocustomers’requirements.Max. weight:500kgs of Powder.

Top Right: Mixing action of Maxivac 17 mixer.

Opposite: Special commission photo taken with kind permission of Selex S&AS.

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MAXIVAC 17 MAXIVAC 35 SPECIAL COMMISSIONSELEX S&AS(Formerly British Aerospace Systems)

Vacuum Casting Machines

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Gold Star Powders has a range of casting and melting systems for both the industrial and jewellerysectors. This technology makes the production processes faster, easier and more efficient in themanufacture of cast jewellery.

Currently, there are two induction melting Vacuum Casting Machines available. The smaller model,the GS380, has been designed with the small and medium sized caster in mind, with a cruciblevolume of 2.25 kilos of 18-carat gold and a flask size up to 250mm tall.

The larger model, the GS595, is a fully automated casting machine, and is ideal for the high-volume casting facility. It has the ability to cast from as little as 3.4 kilos of 18-carat gold using thesmallest crucible, increasing to as much as 7.5 kilos of 18-carat gold using the largest crucible.The GS595 has the following benefits:

• 60 Casting Programs, resulting in ease of operation.• Automatic locking system, making safety a priority when using this machine.• Faster metal flow into the mould for the highest quality castings.• Overpressure for optimum filigree work.

Gold Star is a brand name synonymous with quality products at competitive prices. This range ofcasting machines further underlines our commitment to providing the discerning caster with thebest consumables and machinery to optimise efficiency and quality.

Specifications GS380 GS595

Crucible Volume 170ccm = 2,5kg Au18ct* 245ccm = 3,6kg Au18ct*

Up to 130mm x 260mm/ 130mm x 260mm/5“ x 10“5“ x 10“ (perforated with (perforated with or

Vacuum chamber for flasks or without flange). without flange).Smaller flasks are used Smaller flasks are used withwith an adapter an adapter.

Automatic protective gas insert Yes No

Automated casting cycles No Over 70

Automatic flask and chamber lift No Yes

Data printer with diagnosticsystem No Yes

Turbo pressure function Yes Yes

Dimensions in cm H x W x D 80 x 50 x 67 145 x 50 x 82

Weight 85kg 140kg

GS380.

Induction Melting.Industrial and Jewellery Casting.

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GS380 GS595

Consumables

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Gold Star Powders stocks an extensive collection of consumables and spare parts, used on a daily basis, in anyjewellery or industrial manufacturing facility. Only a selection of consumables stocked is detailed below –please refer to the website for the full listings. Gold Star will aim to deliver items as fast as possible all over theworld, and has the ability to manufacture bespoke consumables to suit your needs.

In addition to the Investment Powders, Waxes and Rubber we are able to offer, Gold Star has the ability to setup a complete Turnkey Jewellery manufacturing set-up.

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Sizes are listed in the table. Flasks are available in both Non-Perforated, forcentrifugal casting, and Perforated & Flanged for vacuum casting. Customflasks can be manufactured to any size or shape.

Gold Star stocks a full range of Crucibles to fit all makes and types ofcasting machines. The crucibles are manufactured from a choice of materialsincluding: Carbon, Alumina, Alumina Prosolanie, Ceramic & Zircon andCeramic with a graphite liner. Please see website for more details.

Non-conducting Crucible Stirring Rods.Diameters Available: 4, 6, 8, 10mm. Lengths Available: 200, 300mm.

Stainless Steel (custom sizes available)Available for Flask Diameters: 2, 3, 4, 5, 6, 7, & 8 inches.

Lens: ClearImpact Resistance: CE-EN166, ANSI Z87.1UV Protection: 99.9% (between 180 and 380nm).

Approval for use for protection against impact, liquid splash and moltenmetal splash. Meets 120m/s impact strength and will resist radiant heat ofup to 1500°C.

Flexible Rubber Mixing Bowls designed for mixing investment powder.Sizes available: 0.5, 1 & 2 litre capacity.

Solid Nickel Handle Scalpels (BS 2982, BS EN 27740, ISO 7740)Carbon Steel Blades in packs of 10 (BS 2982, BS EN 27740, ISO 7740).

Spray Can, 340 grams, non-toxic, non-CFC gas.

Solid Aluminium Frames for vulcanising rubber moulds.Size Available (length x width x depth): 73x47x19 and 73x47x25 (mm).

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Stainless Steel FlasksFJCA

CruciblesFJCR

Quartz & Carbon RodsFJCMA-QR

Flask Handling TongsFJCA-SCI/IND

Safety GlassesFJCON-PPESG

Safety HelmetsFJCON-PPESH

Rubber Mixing BowlsFJCON-BOWL

Scalpels & BladesFJCON-SUB

Silicone Mould ReleaseFJCMA-SRS

Mould FramesFJCMA-MF

Flask SizesNon-perforated

Perforated & Flanged

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Custom sized flasks are available to order.

In-House Calcining and Milling FacilityCristobalite & Silica Manufacture

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Gold Star Powders is the only manufacturer of InvestmentPowder in the industry to have its own silica deposits, andcustom-built, $7.2 million rotary kiln and grinding facility, tomanufacture high-grade, unmineralised Cristobalite.

Set in the picturesque Derbyshire Peak District, you will findGold Star Powders Minerals Division. Here, raw materials usedin the manufacture of the finest-grade Investment Powder areproduced and milled to the most exacting standards. It is thisstrict attention to particle size analysis that enables Gold StarPowders to produce the variety of grades of raw materialnecessary for the manufacture of such a wide variety ofproducts. From this facility, we ship high-grade, non-mineralised Cristobalite to our plants, worldwide.

Opposite: Gold Star Powders Mineral Division, located in the Peak District, Derbyshire.

Right: $7.2 million Calcining and Milling Facility.

Inline Particle Size Analyser.

Gold Star Powders UKUK Production and Worldwide R&D Centre

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INVESTMENTPOWDERS

Thermal Expansion Measurement. XRD - Cristobalite & Silica Anaylsis. XRF - Material Composition Anaylsis.

Automated Plant Control System.


Gold Star TechnologyGold Star Powders UK is at the heart of technology in thedevelopment and testing of Investment Powders throughoutthe Gold Star Group of Companies (that manufacture thefamous Gold Star brand around the world).

The extensive laboratories, sited in Newcastle-under-Lyme, arestaffed with highly-trained technicians, and are equipped withstate-of-the-art testing machinery, such as the XRF, XRD &thermal expansion machines, which ensure that only rawmaterials of the highest grades and quality are used in any ofour mixing facilities throughout the world. All InvestmentPowder produced must pass stringent test-criteria specificationsbefore dispatch. Every batch of Investment Powder produced istested in a full casting trial in our in-house casting shop,

Only after passing these casting trials and showing no faults, isthe batch of powder released to the customer.

Our state-of-the-art, computer-controlled mixing plant andbagging facility, consisting of two five tonne mixers, is alsobased in Newcastle-under-Lyme. This is the most modernInvestment Powder manufacturing plant in the world and is thelargest of its kind, capable of producing upwards of 2,000tonnes per month of Investment Powder on a 24 hours a day,six days a week, shift pattern.

Opposite: UK facility bagging plant.

Siam Casting Powders Ltd.

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INVESTMENTPOWDERS

Siam Casting Powders Ltd.SCP is a joint venture between Gold Star Powders UK, and our Thai partners, tomanufacture Investment Powders in Thailand. All production development andformulation is controlled by Gold Star Powders UK. Siam Casting Powders suppliesthe finest-quality Investment Powders and materials for the local casting industries,utilising High Grade unmineralised Cristobalite, supplied by Gold Star’s in-houseCalcining and Milling Facility in Derbyshire, England.

SCP offers a technical consultancy service throughout Thailand to help improvecasting quality and factory efficiency. Please contact SCP for more details.

Siam Casting Powders Products UK EquivalentProduct

LC Brass GS LC Brass

Value (Red, Orange & Yellow) GS 21

Best Cast GS Delta

Professional GS XL

Supreme GS XXX

Supreme Plus GS XXX Plus

Omega GS Omega

Other ProductsSupplied in Thailand

Injection WaxesSilicone RubberNatural RubberVacuum Mixing MachinesDe-wax and Burnout FurnacesWax InjectorsCasting ConsumablesVacuum Casting Machines

www.siamcasting.com

For over 2500 years, Thailand has been a stronghold of Buddhism.The Buddha’s teachings (Dharma) colour almost every aspect of lifewithin the kingdom.

Siam Casting Powders Team.Factory opened 2002.

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INVESTMENTPOWDERS

Siam Casting Powders LtdGeneral Manager: Boonchana Anurak

Tel: +66 34 246 037-8

Fax: +66 34 246 039

Email: [email protected]

Address: 185 Moo 5 SalayaBhudhamontolNakorn Phatom 73170Thailand

Bangkok

Chiang Mai

Phuket

The Phi Phi Islands in Phuket are widely considered to be among the most beautiful places in the world, and hence are also the primeattraction of Krabi. The Phi Phi Islands is a chain of six islands; the second largest among them is the Phi Phi Le Island. Phi Phi Le is alsoknown as James Bond Island, Phuket, named after the 007 James Bond film - ‘The Man with the Golden Gun’ (1974).

For your localdistributor details, seewww.goldstarpowder.com

Gold Star Powders ChinaUltratec Ltd

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INVESTMENTPOWDERS

Ultratec UK EquivalentProducts Name Product

Gold Star 6 LC Brass

Gold Star 21 Gold Star XL

Gold Star 24 Gold Star XXX

Gold Star 28 Gold Star Gem Set

Gold Star 38 Gold Star Omega+

Gold Star HT Gold Star HT

Gem Set Gem Set

Atomic 78 Atomic 78

Other Products supplied in ChinaInjection Waxes, Silicone Rubber, Natural Rubber,Vacuum Mixing Machines, De-wax and Burnout Furnaces,Wax Injectors, Casting Consumables, Vacuum CastingMachines. The Great Wall of China.

Ultratec Investment PowderUltratec Jewelry Supplies Ltd is a sister company of Gold StarPowders UK. It is committed to providing high-qualityInvestment Powders, with consistent performance, that meetthe UK production and quality standards. Ultratec offers twoinvestment brands to the China market:

Gold Star range products have long been used by worldwidecustomers. They are formulated specifically for casters who arelooking for the very best surface finish, and trouble-freeInvestment Powder, every time.

Tecast Brand is also benefited from UK techniques, recipesand finest raw materials. It is specifically designed for theChina market, and consists of TT Brass, TT Silver, TT Gold,TT Gemcast, TT Resincast, TT330(Stainless Steel) andTT530(Platinum). They are extremely easy to use and giveexcellent results.

Factory opened 2006.

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INVESTMENTPOWDERS

Gold Star Powders ChinaUltratec Jewelry Supplies (Guangzhou) Ltd.

Name: Kevin Xie - General Manager

Tel: +86 20 3997 0330

Fax: +86 20 8492 1620


Address: Minli Industrial ZoneLan He Town, Pan Yu DistrictGuangzhou, China, 511480

LOCATION CONTACT ADDRESS TELEPHONE / FAX / MOBILE

Pan Yu Mr. Kevin Xie Ultratec Ltd Tel: +86 (0) 20 3997 0330Minli Industrial Zone, Fax: +86 (0) 20 8492 1620Lan He Town, Pan Yu District, Email: [email protected], China 511480

Pan Yu Mr. Howard Han Tecast Trading (Guangzhou) Co. Ltd Tel: +86 (0) 20 8480 0096No.567 Qiaoxing Road, Fax: +86 (0) 20 8480 0090Shiqiao Town, Pan Yu District, Mob: +86 (0) 13922303060Guangzhou, China, 511400 Email: [email protected]

Shenzhen Mr. Wilson Zheng No. 315 the 5th Building Nanshen Tel: +86 (0) 755 2231 6620Industrial Honggang Road Luoho, Fax: +86 (0) 755 2231 6621Shenzhen, China, 518024 Mob: +86 (0) 13828851122


Haifeng Mr. Lin Mei Long Town, Hai Feng Xian, Tel: +86 (0) 660 682 4422Shan Wei City, Guang Dong Fax: +86 (0) 660 682 4422Province, 516400 Mob: +86 (0) 13927931193

Fuzhou Mr. William Ma Shop 04, No.1 Building, No.33 Xian Tel: +591 8347 7677Feng Road, Cang Shang District, Fax: +591 8347 7677Fuzhou, China, 350007 Mob: +86 (0) 13805005871


Qingdao Mr. Zhao Xi Tian Cun, Chengyang Road, Tel: +86 (0) 532 8775 2210Chengyang District, Fax: +86 (0) 532 8775 2887Shi Shan Dong Province, Mob: +86 (0) 13964886317China, 266109 Email: [email protected]

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www.goldstarpowders.cnFor your local distributor details seewww.goldstarpowder.com

Gold Star Powders India

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INVESTMENTPOWDERS

Gold Star Powders IndiaGold Star Powders Private Ltd. India is a sister company ofGold Star Powders UK. It was incorporated in June 2001 withthe objective of serving the local industry more efficiently.

LOCATION Map Location CONTACT NAME ADDRESS TELEPHONE / MOBILE / EMAIL

CHENNAI MR. K. KALYANARAMAN GOLD STAR POWDERS PRIVATE LTD. T +91 044-24962939No 112 CHINNA AMMAN KOVIL STREET, E [email protected], THIRUPORUR PANCHYAT, KANCHIPURAM DISTRICT, PIN 603110

MUMBAI MR.G. GOLD STAR POWDERS PRIVATE LTD. T +91 022-29205019DHARMENDRA GALA NO. 58A, RAJ INDUSTRIAL COMPLEX, M +91 2228592188SOLANKI MILITARY ROAD, ANDHERI EAST, MUMBAI- 400059 E [email protected]

JAIPUR MR. DURAI GOLD STAR POWDERS PRIVATE LTD.MURUGAN S 31, SUBASH NAGAR SHOPPING CENTRE, SASTRI M +91 9829013070

NAGAR, JAIPUR- 302016 E [email protected]

MUMBAI MR. ANAND SETHIA SETHIA AND COMPANY T +91 022-2340233144, 11 AGIARY LANE, GROUND FLOOR, M +91 9833173218MUMBAI- 400003 E [email protected]

BANGALORE MR. ANIL BABU MODERN TOOLS T +91 080-4151655010 & 11, PRAKRUTHI BUILDING, SHOP NO.1 M +91 9886192750SIDDANA LANE, NAGARATHPET CROSS, E [email protected] 560002

COIMBATORE MR. ANIL BABU MODERN TOOLS T +91 0422-4355436SHOP NO. 14, R.R COMPLEX, 537 BIG BAZAAR M +91 9362951616STREET, COIMBATORE- 641001 E [email protected]

HYDERABAD MR. RAVINDHARNATH KOVIDH ENTERPRISESMULKA 40O B BABU KHAN ESTATE, BASHEERBAGH, M +91 4066732267

HYDERABAD 500001 E [email protected]

JAIPUR MR. SHANKARLAL GLOWEL CASTECH T +91 0141-5103840AGARI F-181 GAUTHAM MARG, BEHIND BAGADIA M +91 9928256698

BHAWAN, C SCHEME, JAIPUR

KOLKATA MR. SANJIB RAMA TOOLSKUMAR MULLICK VILL-KISMAT APURBAPUR, SINGUR-DISTRICT, M +91 9474124308

HOOGHLY, WEST BENGAL

MAURITIUS MR. CHOTA CPC JEWELLERY TOOLS CO. LTD T +91 00230-2124897PURMESSUR 64 MENAGERIE ROAD CASSIS M +91 00230-7736027CONHYDOSS PORT LOUIS E [email protected]

NEW DELHI MR. HIMESH GLOWEL METCHEM INDUSTRIES T +91 011-25752454NAGPAL 523 JOSHI ROAD, KAROL BAGH, M +91 9910921985

NEW DELHI- 110005 E [email protected]

RAJKOT MR. ANAND HITEN ENTERPRISE T +91 0281-6533085MACCHAR 1 GANDHI SMRUTI SOC, STREET NO.3, M +91 9374106944

PEDOK ROAD, RAJKOT- 360003

SRI LANKA MR. RIZKY DEEN COLOMBO MACHINERY & EQUIPMENTS LTD T +94 112449449No. 26B, ALWIS PLACE F +94 112449339COLOMBO 03 M +94 777343155

E [email protected]

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www.goldstarpowders.in

Investment PowdersMade in India

Gold Star Brass CastGold Star 21 (Delta)Gold Star XLGold Star XXXGold Star OmegaGold Star Gem SetGold Star HTAtomic 78

Other ProductsSupplied in IndiaInjection WaxesSilicone RubberNatural RubberVacuum Mixing MachinesDe-wax and Burnout FurnacesWax InjectorsCasting ConsumablesVacuum Casting Machines

Factory opened 2001.

51

INVESTMENTPOWDERS

1 Chennai5

Bangalore

7

Hyderabad

6

Coimbatore

2 4

Mumbai

3 8

Jaipur

9Kolkata

13Colombo10

Mauritius

SRI LANKA

11

New Delhi

12Rajkot

WAREHOUSE

DISTRIBUTOR

Gold Star Powders Private Ltd

112 Chinna Amman Kovil Street

Kalavakkam Village

Thiruporur Panchyat

Kanchipuram District

Pin 603110, India

Gold Star Powders Private LtdGeneral Manager: K. KALYANARAMAN

Tel: +91 044 2496 2939

Fax: +91 044 2496 1262


Taj Mahal is regarded as one of the seven wonders of the world. Some Western historianshave noted that its architectural beauty has never been surpassed.

For your local distributor details,see www.goldstarpowder.com

Gold Star Brasil

52

INVESTMENTPOWDERS

Gold Star BrasilGold Star Powders is always keen to be as close as possible toour customers and their individual needs, with manufacturingfacilities opened in India, Thailand and China in the past fiveyears. Our latest overseas joint venture project is in São Paulo,Brasil.

Gold Star Brasil was founded in 2008. It produces the worldfamous Gold Star jewellery Investment Powders in São Paulostate, and distributes the complete range of investmentpowders, waxes, machinery and consumables to the continentof South America.

All of the Investment Powders are manufactured to the samerecipes as those produced in the United Kingdom, and allpowders will be subject to the same stringent quality checks.These include laboratory testing for expansion, gloss-off andsetting times; each batch is also cast using both brass and silverbefore being allowed to be despatched to the customer.

Backed by the technical support and raw materials from theU.K., the entire continent of South America will benefit fromhaving the highest quality casting powders manufacturedlocally.

São Paulo

www.goldstarbr.com.br

Investment PowdersMade in BrasilGold Star LC BrassGold Star XLGold Star XXXGold Star OmegaGold Star Gem SetGold Star H.T.Platincast Atomic 78

Other ProductsSupplied in BrasilInjection WaxesSilicone RubberNatural RubberVacuum Mixing MachinesDe-wax and Burnout FurnacesWax InjectorsCasting ConsumablesVacuum Casting Machines

53

INVESTMENTPOWDERS

Brasil

Venezuela

Colombia

Peru

Chile

Argentina

São Paulo

Rio de Janeiro

Belo Horizonte

Caracas

Bogota

Lima

Santiago

BuenosAires

Gold Star BrasilGeneral Manager: Mr Paolo Malfatti

Tel: + 55 11 9159 8728


Gold Star BrasilRua das Margaridas s/nTerra Preta - Mairipora SPCEP 07600 - 000São Paulo, Brasil

Iguaçú Falls – Straddling the Brasil/Argentina border, at 11/2 miles across, this semi-circular waterfall is one of thewidest and most spectacular in the world.

FACTORY

DISTRIBUTOR

For your local distributor details,see www.goldstarpowder.com

Troubleshooting

54

INVESTMENTPOWDERS

Flashing Possible Fault Cause SolutionIncorrect Water or Powder Ratio Ensure Correct Ratio P:W

Conventional Mix 40:100Vacuum Mix 38:100

Incorrect Burnout Cycle Follow recommended burnout cycle.Ensure furnace ramp does NOT exceed 250ºC/Hr.Ensure 1st stage burnout does NOT exceed 240ºC and is held for 4.5 hours minimum. If problem still occurs increase hold time.

Excessive Casting Forces Centrifugal casting: Lower torque and RPM settings.Vacuum casting: Reduce over pressure.

Disturbed Flask during setting After investing bench set and do NOT move flask, strip base or remove tape for a minimum of 90 minutes.

Over working investment Ensure all flasks are poured and removed from vacuum tank and put on bench to set by max. 9 minutes from starting mixing.

Waxes too close Waxes too close together creating a very thin wall of investment. Waxes too close to side or top of flask; ensure min. 5mmgap to top and sides of flask.

Slurry too hot or cold Adjust slurry temperature to 21ºC +/- 1ºC by increasing or decreasing water temperature.

Moulds dried out before burnout If flasks are left on bench for more than 4 hours before burnout place a damp towel over the tops of the flasks to stop themdrying out. Do NOT leave flasks in furnace overnight before burnout.

Flask base leak during investing Ensure good seal between wax sprue and base. It is suggested that it be sealed with molten wax.

Rough Surfaces Possible Fault Cause SolutionOverheated flasks Follow recommended burnout cycle.during burnout Ensure furnace ramp does NOT exceed 250ºC/Hr.

Ensure 1st stage burnout does NOT exceed 240ºC and is held for 4.5 hours minimum. If problem still occurs, increase hold time.

Dust on waxes or trees Ensure once waxes or wax trees are made, they are stored in a dry, clean and dust-free atmosphere. Do NOT store waxes ortrees in a dusty environment or investing room.

Metal temperature incorrect Reduce or increase metal temperature (see burnout section).

Rough waxes Ensure excessive talc or release agent is not used, as this will produce rough waxes and therefore rough castings.

Flask burns out too quickly Do NOT burn out before minimum of 90 minutes after investment.

Under or over-worked Follow the recommended mixing instructions (see product pages).

Steam de-waxed for too long Steam de-wax for a maximum of 60 minutes at atmospheric pressure. If steam de-waxed for longer than 90 minutes,the steam will start to erode the surface of the mould. Do NOT steam de-wax in a sealed container.

55

INVESTMENTPOWDERS

Non or partial fill Possible Fault Cause SolutionMetal temperature incorrect Increase metal temperature first before increasing the flask temperature (see burnout section).

Flask temperature incorrect Increase flask temperature (see burnout section).

Incorrect feed / sprue system Feed or gate should be attached to the thickest part of the casting. It should be at least 25% of the thickness of thecasting.

Insufficient centrifugal force Increase torque first and then RPM of the centrifugal casting machine. Only increase by small amounts each time (5%).

Low vacuum when vacuum casting Change oil in pump on a regular basis. Check seals for blockages in the vacuum pipes.

Not enough over pressure Only increase over pressure by small amounts each time (5%).

Bubbles Possible Fault Cause SolutionBad vacuum Change oil in vacuum pump. Pump should be serviced on a regular basis.

Check for leaks in vacuum pipes and chambers.Check mixing and pouring chamber are pulling equal vacuum levels.

Dust on waxes or trees Ensure once waxes or wax trees are made, they are stored in a dry, clean and dust-free atmosphere. Do NOT storewaxes or trees in the same room that you weigh powder or invest in.

Rough waxes Ensure excessive talc or release agent is not used, as this will produce rough waxes and therefore rough castings.

Under or over worked Follow the recommended mixing instructions.

Not vacuuming flasks after pouring Ensure flasks are vacuumed for 1 minute after being poured.

Blisters Possible Fault Cause Solution1st stage burnout hold too short Ensure 1st stage burnout hold time at 220ºC is 4.5 hours. If problem still occurs, increase hold to 5.5 hours.

Flasks de-wax at too high a temperature Do NOT exceed 240ºC in the 1st-stage burnout (see burnout section).

Flasks placed in furnace too soonafter investing Do NOT burn out before min. 1 hour after investing.

Flask placed too close toor touching elements Leave a minimum of 50mm gap between flasks and elements.

Product Selection and Care

56

INVESTMENTPOWDERS

Product CareEnsuring the best results

Reseal bag after use, otherwise moisture inair will damage Investment Powder and leadto rough castings and cracking.

Store Investment Powder in an ambienttemperature of between 10°C & 35°C.Temperatures outside this range may causeproduct degradation and lead to casting faults.

Ensure minimum contact with moisture, andstore in a low-humidity environment withgood air circulation.

Store product off the ground, to avoid moisturepicked up through surface contact; preferablyon a pallet. Do not store on a damp pallet.

To avoid problems, aim to use InvestmentPowder within 6 months of production date(max 12 months); the production dates ofbatches are on the batch label (see example).

M028INDUSTRIAL

GOLD

M356INDUSTRIAL

ALU

MIN

IUM

BR

ASS

SILV

ER

9CT

YEL

LOW

12C

T Y

ELLO

W

14C

T Y

ELLO

W

LCBRASS

XXX

OMEGA+

ATOMIC78

PLATINUMCAST

HT

18C

T W

HIT

E (N

ICK

EL)

18C

T W

HIT

E (P

ALL

AD

IUM

)

14C

T W

HIT

E (P

ALL

AD

IUM

)

9CT

WH

ITE

(PA

LLA

DIU

M)

18C

T Y

ELLO

W

22C

T Y

ELLO

W

XL

STA

INLE

SS S

TEEL

PLA

TIN

UM

PALL

AD

IUM

Gold Star OmegaBatch: 78/01Prod. Date: 19/02/2008

Ref: 20922.5kgs

001

BATCHIDENTIFICATIONNUMBER

When quoting batch number to supplierplease provide both batch and referencenumber.

BAG WEIGHT

PRODUCT TYPE

BAG NUMBEROF BATCH

BATCHREFERENCENUMBER

PRODUCTIONDATE OFBATCH

57

INVESTMENTPOWDERSFurnace Controller Guide

DTC6The majority of casting faults are directly related to an incorrect burnout cycle or lack of control of the burnoutcycle. By using a high quality digital temperature controller such as the DTC6 many variables, that can lead toproblems associated with burnout, can be tightly controlled and thus dramatically reduce rework rates andscrap levels in any scale of manufacturing facility.

Gold Star Powders, in conjunction with a UK digital instrument manufacturer, has designed the DTC6 digitaltemperature controller specifically for the lost wax casting industry. The DTC6 works by controlling therelay/contactor in the furnace (the DTC6 does not include a contactor or relay). All GSP furnaces are suppliedas standard with the DTC6 fitted, the product may also be purchased from GSP as a stand-alone unit to retrofitto most makes of electric furnace.

One of the major problems experienced in countries that suffer from regular power cuts is that the furnaceshuts off and will not complete the burnout cycle. The DTC6 has Power Failure Recovery facility so that, in theevent of a power cut, the controller logs the stage in the cycle and when the furnace is powdered up againthe controller re-heats the furnace back to the temperature where it lost power and continues with theprogrammed burnout cycle (the controller will log cycle position for up to 2 hours).

Programming A firing step within the burnout cycle program consists of a temperature ramp (positive or negative) followedby a soak period. Between 1 and 9 steps may be used in a burnout cycle depending on the requirements ofthe user.

The controller ramps the burnout furnace at the specified rate until the required soak temperature is reached.The program then controls the furnace temperature at the specified soak temperature for the desired lengthof time. Once this step is complete the controller then runs through the subsequent steps until the program iscomplete. Once the program is complete the controller will display “END”.

It is very important to soak flasks at the desired casting temperature for a minimum of 1 hour in order for thecore of the flask to decrease in temperature.

NB: The DTC6 can only be used to control electrically powered furnaces.

MAIN DISPLAY

CONTROLKEYS(5)

DISPLAYINDICATORS

FIRING LAMP

SEGMENTMIMICDISPLAY

Key Features

Easy to usePower Failure RecoveryDelayed Start Facility 1 – 99 hours9 Programs (up to 9 steps each)Soak Time 1 – 99 hoursRamp Rate 1 – 99 ?C/hourProgram Pause FacilityEnergy Usage DisplayLockable Keyboard

SOAK TIME LAMP

SOAK TEMPERATURE LAMP

COOLINGRAMP LAMP

HEATINGRAMP LAMP

DELAYEDSTART LAMP

DelayHeating

CoolingSoaking

t

°C

Worldwide Distributor List

58

Algeriacontact GSP UK

ArgentinaBuenos Aires

contact GS Brasil

ArmeniaYerevan

OnyxGegham MadanyanTel: +374 1 541 102

Australia and New ZealandBrisbane

Australian Jewellers Supplies Pty LtdMark WaltonTel: +61 7 3229 4955Email: [email protected]

Austriacontact GSP UK

BahrainManama

Gemstones & Jewellers Pty LtdMr A SalehEmail: [email protected]

BelgiumKortrijk

L Buysschaert & Co B V B ALuk BuysschaertTel: +32 5622 0549Email: [email protected]

BrasilBelo Horizonte

BQZ Comercial LtdaMr Daniel Hadad GiffoniTel: +55 31 368 19400Email: [email protected]

São Paulo

Gold Star Brasil Mr Paolo MalfattiTel: +55 11 9159 8728Email: [email protected]

Bulgariacontact GSP UK

Canadacontact GSP UK

ChileSantiago

contact GS Brasil

ColombiaBogota

contact GS Brasil

Croatiacontact GSP UK

CyprusNicosia

Joannou & Joannou LtdMr Yiannos IoannouTel: +357 227 5251Email: [email protected]

Czech RepublicKraslice

Amati-Denak Spol SroMartin CibulkaTel: +420 168 686 531Email: [email protected]

Prague

Auren CZ s.r.o. Radim SidaTel: +421 3663 12294Email: [email protected]

Denmark and SwedenVallensbaek

Aktiv Guld A/SMr Carsten JensenTel: +45 43 66 2000Email: [email protected]

EgyptCairo

El Aroussi Trading & Chemical CoAlex El AroussiTel: +202 258 3491Email: [email protected]

FinlandSorkkinen

SAR-Machine OYMr Aimo RankiTel: +358 28 651 789Email: [email protected]

FranceParis

ABF DistributionMr CholletTel: +331 4797 0770Email: [email protected]

GermanyBottrop-Kirchhellen

KBO GmbHMr Franz HallTel: +49 2045 9619Email: [email protected]

Pforzheim

Linkenheil GmbH Mr Manfred LinkenheilTel: +49 72312 1734Email: [email protected]

GreeceAthens

St. Michailidis & SonsSpiros MichailidisTel: +30 210 324 2270Email: [email protected]

HungaryBudapest

AUREN Kft.Mr Peter TothTel: +36 1299 0938Fax: +36 1299 0939Email: [email protected]

J Schmalz Budapest KFTMr Frank OberfrankTel: +36 1203 4664Email: [email protected]

IndiaChennai

Gold Star Powders Private LtdMr K. KalyanaramanTel: +91 44 2496 2939Email: [email protected]

IndonesiaJakarta

P T Makmur Meta Graha DinamikaMr B SudinTel: +62 216 904432Email: [email protected]

IranTehran

contact GSP UK

IsraelTel Aviv

B & B Benbassat LtdMr Nissim BenbassatTel: +972 368 30216Email: [email protected]

INVESTMENTPOWDERS


ItalyArezzo

Self FIOA SRLMr Revilio CasiTel: +39 575 355 024Email: [email protected]

Gerenzano-Saronno

Mario Di Maio Spa Mr Eliseo Di MaioTel: +39 02968 2360Email: [email protected]

Vicenza

Tecnica Oro Srl.U. Mr P L VaccaTel: +39 0444 914 257Email: [email protected]

JapanTokyo

Cast 18Mr Kazuya FuruzonoTel: +81 354 29 8470Email:[email protected]

KoreaIncheon

Mirinae Co. LtdMr C S ParkTel: +82 325 810255Email: [email protected]

KuwaitMubarakiya

Arbash InternationalYounis BegTel: +965600 1445Email: [email protected]

LebanonBeirut

BimboMr Krikor TouhfonianTel: +9611 263 054Email: [email protected]

MalaysiaPenang

Arena Ceria TradingMr HamTel: +60 42 828629Email: [email protected]

MauritiusCassis

Allegra Creation LtdMr Christian PonciniTel: +230 212 0818Email: [email protected]

MexicoMerida-Yucatan

Stuller Service CentersMr M MoserTel: +999 942 7950Email: [email protected]

Morocco Casablanca

Ets Nil Abdeslam Import ExportMr Nil AbdeslamTel: +28 0157 816 071

NetherlandsBleiswick

Bijou Moderne BVThomas BodeTel: +31 010 529 6600Email: [email protected]

S-Hertogenbosch

Van Amelsfoort Jan GroosTel: +31 73 692 8050Email: [email protected]

NorwayOslo

AS NogusraMr Odd OlsenTel: +47 22 966 100Email: [email protected]

PakistanLahore

Iqbal EnterprisesKhalid MirzaTel: +92 4276 52443Email: [email protected]

PeruLima

contact GS Brasil

PhillipinesMetro Manilla

Solutionomics Inc. Mr Daniel ZbindenTel: +63 2826 9137Email: [email protected]

PolandWarsaw

M W CastWalerek WalantinovizTel: +48 227 961608Email: [email protected]

PortugalGondomar

Maquinouro Maquinas E Ferramentas LDArmando Da SilvaTel: +351 224 835551Email: [email protected]

P.R. ChinaGuangzhou

Tecast Trading (Guangzhou) LtdMr Howard HanTel: +86 (0) 20 84 8000 96Email: [email protected]

Panyu

Ultratec Jewellery Supplies Ltd Mr John ZhaoTel: +86 203 997 0330Email: [email protected]

Romaniacontact GSP UK

RussiaMoscow and St. Petersburg

ZAO PCF SapphireMr I ZhuravlevTel: +74 957 394 311Email: [email protected]

Saudi ArabiaJeddah and Riyadh

Gold & Jewellery Tools & Material CenterMohammed KumaziTel: +966 645 2714Email: [email protected]

Slovak RepublicLavice

Auren SROGabriel NovotnyTel: +421 3663 1 3264Email: [email protected]

South AfricaPretoria

Goldsmith & Jewellery SuppliesMr Julian EdelsonTel: +271232 31178Email: [email protected]

59

INVESTMENTPOWDERS


60

SpainBarcelona

Hispana de Maquinaria SASr. Eduardo GraciaTel: +34 93 309 1707Email: [email protected]

Cordoba

Raya Sr. R RayaTel: +34 95 743 2326Email: [email protected]

Madrid

Rivero Rivero S.A. Paloma Alegre RiveroTel: +34 91 445 9412Email: [email protected]

Switzerlandcontact GSP UK

SyriaAleppo

Hovanes D. ArtinianMr Hovanes Der ArtinianTel: +963 21 446 8208Email: [email protected]

TaiwanTainan

Asia Diamond Ind Co LtdChen-Jung KaoEmail: [email protected]

ThailandBangkok

Siam Casting Powders LtdBoonchana AnurakTel: +66 34 246 037Email: [email protected]

Tet Design Co. Ltd. RatikornTel: +66 18 212 863Email: [email protected]

TurkeyIstanbul

Odak KimyaSuleyman SahinTel: +90 2126 389 417Email: [email protected]

U.A.E.Dubai

Harshad Trading Co LtdMr Bhupesh H DhakanTel: +97 14 226 1723Email: [email protected]

UKNewcastle-under-Lyme

Gold Star PowdersTel: +44 (0) 1782 663600Email: [email protected]

UkraineLviv

Rundist LtdMs Oksana MochernyukTel: +380 322 636 319Email: [email protected]

USABremerton

Alpha Supply IncMr Alan CleverTel: +1 206 577 2700Email: addinc.@qwest

East Brunswick

American Jewelry Supply Peter FeinermanTel: +1 732 432 0101Email: [email protected];

[email protected]

Miami

BTI Landa Mr. Elvis TolidoTel: +1 212 944 4944

Michigan

C R Hill Inc. Mr Greg KoukoudianTel: +1 248 705 0475Email: [email protected]

New Mexico

Indian Jewellers Supply Co. Mr Chris CaldesTel: +1 800 545 6540Email: [email protected]

Rhode Island

Bel Air Finishing Supply Inc Mr Steven AlvitiTel: +1 401 781 4408Email: [email protected]

VenezuelaCaracas

Inversiones Waymil C. A.Mr Jose D. GarciaTel: +58 212 860 8385Email: [email protected]

Vietnamcontact GSP UK

INVESTMENTPOWDERS

If you are interested in becoming a dealer of

Gold Star Powder Products please contact:

Spencroft Road, Newcastle-under-Lyme

Staffordshire, ST5 9JE, England

Tel: +44 (0) 1782 66 36 00

Fax: +44 (0) 1782 66 36 11


Website: www.goldstarpowders.com

61

Best Practice

Mixing Hints & Tips

Ensure correct powder-to-water ratio is used.

Never add water to powder as it will become lumpy when mixing(always make sure you add water first).

Aim for a slurry temperature of 21°C for optimum casting results.

Use clean de-ionised water for investing.

Weigh out powder and water rather than using any other method of measurement.

Regularly service and change oil in your vacuum pump for bubble-free castings.

Regularly calibrate weigh scale to achieve optimum powder & water weights.

Burnout Hints & Tips

Do not begin burnout process until 90 minutes after investing.

If flasks are to be left for more than 4 hours before burning out, place a damptowel over the tops of the flasks to stop them drying out. If this is not done,casting faults may occur.

Do not exceed 630°C at any stage of the burnout when casting stone in place.

Decreasing the length of your burnout will increase throughput, but may produce alower standard of surface finish or, in some cases, lead to mild flashing.

You will achieve better results fast-firing Vacuum Flasks rather than CentrifugalFlasks, as the perforations in the Vacuum Flasks increase the investment surfacearea, enabling the release of moisture from the flask during the first stage of theburnout. Centrifugal Flasks may show signs of flashing when very rapidly fired.

Ensure flask holds at casting temperature for a minimum of 1 hour; it will take thislength of time for the core of the flask to fall to the temperature read-out of thefurnace.

Have your furnace calibrated every 6 months as a standard.

Ensure you have a high-quality digital temperature controller for your furnace(available from www.goldstarpowders.com).

Training

Gold Star offers tailor-made training courses to suit your learning needs inInvesting & Casting at one of our factory sites, or at your own facility byspecial arrangement.

Gold Star Training Locations:

UK StaffordshireIndia ChennaiChina PanyuThailand BangkokBrasil São Paulo

Please refer to country sections for contact details.


Metal Metal PouringTemp °C

Metal toWax Ratio

Flask Temp °C

Gol

d

Aluminium 750 - 800 220 - 450 2.5 : 1

Brass 1020 - 1120 500 - 700 9 : 1

Silver (Sterling) 950 - 1050 450 - 650 10 : 1

9ct. Yellow 940 - 1040 500 - 600 11 : 1

12ct. Yellow 620 - 1020 500 - 600 12 : 1

14ct. Yellow 900 - 1000 500 - 600 14 : 1

18ct. Yellow 950 - 1050 500 - 650 16 : 1

22ct. Yellow 1040 - 1140 600 - 700 18 : 1

9ct. White 970 - 1070 580 - 680 12 : 1

14ct. White 1050 - 1170 600 - 700 14 : 1

18ct. White 1100 - 1250 600 - 740 16 : 1

Platinum (95%) 1900 - 2000 750 - 900 21 : 1

Stainless Steel 1625 - 1675 750 - 900 10 : 1

Palladium 1550 - 1600 750 - 900 12 : 1

Temperatures & Ratios

United KingdomGOLD STAR POWDERSSpencroft RoadNewcastle-under-LymeStaffordshire, ST5 9JEEnglandTel: +44 (0) 1782 66 36 00Fax: +44 (0) 1782 66 36 11Email: [email protected]: www.goldstarpowders.com

ThailandSIAM CASTING POWDERS LTD.185 Moo 5 SalayaBhudhamontol Nakorn Phatom 73170ThailandTel : + 66 34 246 037-8 Fax: + 66 34 246 039Email : [email protected]: www.siamcasting.com

ChinaGOLD STAR POWDERS CHINAULTRATEC LTDMinli Industrial Zone, Lan He TownPan Yu District, Guangzhou China 511480Tel: +86 20 39970330Fax: +86 20 84921620Email: [email protected]: www.goldstarpowders.cn

IndiaGOLD STAR POWDERS PRIVATE LTD112 Chinna Amman Kovil StreetKalavakkam VillageThiruporur PanchyatKanchipuram DistrictPin 603110, IndiaTel: +91 44 2496 2939Fax: +91 44 2496 1262Email: [email protected]: www.goldstarpowders.in

BrasilGOLD STAR BRASILGold Star Brasil IndústriaE Comércio de MateriaisPara Fundição Ltda.Rua das Margaridas s/nTerra Preta - Mairipora SPCEP 07600 - 000São Paulo. BrasilTel: +55 11 9159 8728Email: [email protected] Website: www.goldstarbr.com.br

� MANCHESTER

� BIRMINGHAM

� EAST MIDLANDS

LONDON �

DUBLIN � LIVERPOOL �

EDINBURGH �

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