Transformer gasket

What follows is general guide to gasket materials: their properties and applications.

Let’s first of all divide gasket materials into a few broad categories: (Note 1 bar = 14 p.s.i or 100,000 newtons/sq. Metre

1. Low pressures (less than a bar)

a) Temperatures below 100 centigrade (212 farenheit)

Simple lid or dust seals can utilise foam rubber.

If your application involves mineral oils only then consider paper or cork.

If there is water present or or some other liquid or gas look at rubber.

For food, electrical or chemicals you may need a special rubber or PTFE.

Or if you have good flanges and bolt loading then a solution may be non-asbestos jointing.

b) Temperatures above 100 centigrade (212 farenheit) and less than 220 centigrade (428 farenheit)

Consider Special Rubbers or PTFE.

Or if you have good flanges and bolt loading then look at non-asbestos gasket material.

2. High pressures and temperatures above 220 centigrade (428 farenheit)

a) Temperatures up to 450 centigrade (842 farenheit) but STEAM to 230 centigrade (446 farenheit)

First consider non-asbestos jointing.

If your application involves process cycling and steam look at graphite.

3. Special Applications

For temperatures above 450 centigrade with no oxygen present consider graphite.

If you have extreme temperatures but little pressure eg. turbochargers use mica.

Extreme conditions in pipework can be accommodated with spiral wound gaskets.

If you have a specific material requirement, you many require a food quality or pharmaceutical grade material.

Rubberized Cork sheet Nitrile rubber bonded acoustic insulation rubber sheet gasket material

being excellent resistance to oil that can compress without lateral spread, superb dimensional stability that can recover up to 80% of its original thickness, oxidation and ozone, thus regarded as non-swelling thermal insulator cork sheet for electrical industry and wide automotive applications.

Cork rubber sheet gasket material manufactured Sizes w x l Meter 0.6 x 0.9, Thickness MM 3 up to 25,Shore A ± 5 Hardness 50, 70, 80, Compressibility at 28 Kg/cm2 45 to 60, 35 to 50, 15 to 25, Av. Tensile Strength MPa 6, 12, 19 Volume change after immersion in ASTM Oil No.3 for 70 hours at 100°C Temp.% 40, 25, 15, Compression Set % at 70 deg. 80, 85, 90, Recovery % Min. 80 Dimensional change % Max.1.5,Temperature resistance range ºC -30, + 110.

Cork-Rubber-Gasket

It is made by using granulated cork and NBR or NEOPRENE synthetic rubber polymer through compound, pressing, vulcanization. KINDS: 1. 10RCK-105111-----Transformer, Oil sight glass, Switchgears, High Voltage Electrical Apparatus 2. 10RCK-105111R---Railway, Subway Station, Railway Vehicle 3. 10RCK-105112---Drive Shift, Valve Housing Cover, Universal Joint, Hydraulic Transmission System 4. 10RCK-105111S—Gas Supply System 5. 10RCK-105111E—Electric Motor

PROPERTY: DENSITY: 0.8-1.4g/cm3 TENSILE STRENTH(DIN52910)≥1.5MPa COMPRESSIBILITY(ASTM F36): 24 RECOVERY(ASTM F36): ≥80 % Creep Relaxtion Rate(ASTM F38)<90% Thermal stability<135C

Size: To your order Length: 750mm-3000mm Width: 500mm-2000mm Thickness: 0.6mm-100mm

Rubber-Cork-Sealing-CR-Based-10RCK-105111CR-

It is made by using granulated cork and NBR or NEOPRENE synthetic rubber polymer through compound, pressing, vulcanization. KINDS:

1. 10RCK-105111-----Transformer, Oil sight glass, Switchgears, High Voltage Electrical Apparatus 2. 10RCK-105111R---Railway, Subway Station, Railway Vehicle 3. 10RCK-105112---Drive Shift, Valve Housing Cover, Universal Joint, Hydraulic Transmission System 4. 10RCK-105111S—Gas Supply System 5. 10RCK-105111E—Electric Motor

PROPERTY: DENSITY: 0.8-1.4g/cm3 TENSILE STRENTH(DIN52910)≥1.5MPa COMPRESSIBILITY(ASTM F36): 24 RECOVERY(ASTM F36): ≥80 % Creep Relaxtion Rate(ASTM F38)<90% Thermal stability<135C

Size: To your order Length: 750mm-3000mm Width: 500mm-2000mm Thickness: 0.6mm-100mm

Cork Rubber Sheet(Transformer) (10RCK-105111

Cork product

Nu-Cork manufactures synthetic rubberised cork sheets (includes Neoprene, Nitrile, Polyacrylic and other grades) of sizes:

Rubberized cork sheet

Rubberized cork product (gasket, washer)

Nu-Cork maintains a library of thousands of dies, where required precision and custom made cutting dies are produced for clients at cost by expert die makers.

Cork is an impermeable, buoyant material, a prime-subset of bark tissue that is harvested for commercial use primarily from Quercus suber (the Cork Oak), which is endemic to southwest Europe and northwest Africa. Cork is composed of suberin, a hydrophobic substance, and because of its impermeable, buoyant, elastic, and fire retardant properties, it is used in a variety of products, the most common of which is for wine stoppers.

Properties and uses[edit]

Varnished cork tiles can be used forflooring, as an alternative for linoleum,stone or ceramic tiles

Cork's elasticity combined with its near-impermeability makes it suitable as a material for bottle stoppers, especially for wine bottles. Cork stoppers represent about 60% of all cork based production.

Cork is also an essential element in the production of badminton shuttlecocks.

Cork's bubble-form structure and natural fire retardant make it suitable for acoustic and thermal insulation in house walls, floors, ceilings and facades. The by-product of more lucrative stopper production, corkboard is gaining popularity as a non-allergenic, easy-to-handle and safe alternative to petrochemical-based insulation products which are flammable and emit highly toxic fumes when burned.

Sheets of cork, also often the by-product of stopper production, are used to make bulletin boards as well as floor and wall tiles.

Cork's low density makes it a suitable material for fishing floats and buoys, as well as handles for fishing rods (as an alternative to neoprene).

Granules of cork can also be mixed into concrete. The composites made by mixing cork granules and cement have lower thermal conductivity, lower density and good energy absorption. Some of the property ranges of the composites are density (400–1500 kg/m³), compressive strength (1–26 MPa) and flexural strength (0.5–4.0 MPa).[12]