TECHNICALHAND BOOK

Cement Bonded Particle Board

Bison Factory : A.P.

Contents

1. Understanding Bison Panel....................................................... 1

2. Working with Bison Panel.......................................................... 10

3. Partitions.................................................................................... 17

4. Doors......................................................................................... 27

5. False Ceilings............................................................................ 31

6. Flooring...................................................................................... 34

7. Recommended Thickness......................................................... 38

8. Prefab Panel Houses................................................................. 39

9. Comparison of Standards.......................................................... 43

10. Comparision of Properties......................................................... 45

11. Precautions................................................................................ 46

12. Regional Offices........................................................................ 47

UnderstandingBison PanelIntroduction

This manual contains general information and guidelines forunderstanding Bison Panel to get best results in itsapplication.

1

Bison Panel conforms to IS 14276-1995

Bison Panel is a cementbonded particle board madeout of 62% cement 28%wood. The wood used is offast growing species likeEucalyptus and Casurina.Due to adoption of specialmanufacturing process, thepanel acquires the strengththe durability of cement andeasy workability of wood - acombination of qualitiesabsent in other boards.

This multipurpose building board - a proven product incountries around the world is introduced in India by NCLwith imported technology from Bison Werke of Germany.

2

Physical Properties

Density 1250 Kgs/m3

average.

Moisture content 9% + 3% atFactory Point.

Modules of Elasticity (bending) 3000 N/mm2

Bending strength 9N/mm2

Transverse tensile strength 0.4 N/mm2

(perpendicular to surface)

Compressive strength 15 N/mm2

(perpendicular to surface)

Surface Alkalinity pH Between 11 and 13

Nail holding power 205 Kgsperpendicular to surface.

Screw holding power 312 Kgsperpendicular to surface

Fire Resistance

Bison Panel is highly fireresistant and has beenclassified as incombustilematerial in many countriesaround the globe.

Tested in accordance to BS476, Fire test on buildingmaterials and structures - part6, 7 classified it as class ‘O’ building board with class 1surface spread of flame.

Bison Panel can be used for the construction of fire resistingbuilding elements to satisfy the criteria of I.S.O. 834-1975and I.S. 3809-1979 for 1/2 hour to 4 hours fire rating.

Weather Resistant

With cement constituting 62%of its composition the BisonPanel offers excellentresistance to weather. Theboard has been subjected tomany cycles of soaking,freezing and heating withoutany sign of disintegration.

The board should generally be painted for externalapplication to provide a weather seal.

3

Biological

Due to mineralisation of woodparticles by cement, BisonPanel is resistant to termiteand vermin attack. It does notsupport fungus growth. Evenuntreated samples exposed tocontact with the groundsurface for several years haveshown no sign of rot or decay.

Sound Insulation

Air borne sound reductionvaries between 30 and 37 dBfor the frequency range 100-3150 HZ according tothickness of Bison Panel.When used in stud partitioning,a reduction of over 60 dB canbe achieved with suitableconstruction.

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Thickness (mm) 6 8 10 12 16 20 30 40

Reduction (dB) 30 31 32 32 33 34 36 37

Chemically Stable

Bison Panel is produced by anirreversible process combiningcement and wood particles intoa chemically stable buildingmaterial which maintains itsstrength with time andexposure to elements.

The board is unaffected bymany dilute chemicals such as brines, bleaches, detergentsand chlorine solutions.

Dimensionally Stable

Bison Panel has excellentdimensional stability in variableambient temperatures andhumidity conditions.

The swelling in thickness after2 hours of immersion in wateris 1% and after 24 hoursimmersion is only 1.5%.

Longitudinal and transverse swelling will be approximately0.3% for change in relative humidity of air from 30% to 95%at 20 deg C.

5

Wood Workability

Bison Panel can be drilled,sawn and sanded with normalwood working tools.

For bulk volumes, the BisonPanel should be cut withTungsten Carbide Tippedcircular saw and drilled withhigh speed steel drill bits.

Bison Panel can be fixed using screws and nails. Pre-drillinga hole slightly smaller than the shank would be required.

Smooth Surface

Bison Panel is light grey incolour with a smooth finish. Itcan be decorated withminimum preparation. BisonPanel can be finished withLaminates, foils and paintsusing Alkaline resistingadhesives, primers and paints.

6

Durability

Due to dense monolithic structure, installations throughoutthe world show that even without sealing, the cement bondedparticle board suffers insignificant deterioration whenexposed to extreme climatic conditions. The board canwithstand any temperatures from - 40 to + 90 deg. C.

Bison Panel contains no hazardous material like Asbestosor Formaldehyde. Its process dust is harmless. When sawing,cutting or drilling the board, the use of a dust mask isrecommended as power tools in particular can produce finenuisance dust.

Conditioning

At the factory, the boards are stored under controlledenvironmental conditions, so that they are delivered with amoisture content of 9%. On site they should therefore bestored dry within the area of application for a minimum of 24hours. This will allow the material an acclimatisation periodprior to fixing, to adjust to its working condition.

7

Sizes

Dimensions 2440 X 1220 mm (8’ X 4’)

3050 X 1220 mm (10’ X 4’)

Thickness 6, 8, 10, 12, 16, 20, 25, 30, 40 mm

Tolerance 6-10 mm + 0.7 mm

12-16 mm + 1 mm

20-40 mm + 1.5 mm

Length/Width + 5 mm

Squareness 2.5 mm on the width of the panel

Normal PackingWeight - 2 tons (approx) per pallet.

Thickness No. of boardsmm 2440 X 1220 mm 3050 X 1220 mm

(8’ X 4’) (10’ X 4’)

6 80 70

8 60 50

10 50 40

12 40 35

16 30 25

20 25 20

30 17 14

40 13 10

8

Handling

Strapped pallets shouldpreferably be handled by forklifts. If crane is used, broadplastic or fabric slings may beused, but not chain slings whichcan break the edges of theboards.

Bison Panels should be carried one by one and in verticalposition. They should not be laid down on their edges butalways laid flat.

When moving single boards manually they must be carriedon edge by 2 men.

Storage

When storing Bison Panel,they must be laid flat onlevelled surface. If out side,they must be protected - topand sides with water proofsheeting. Panels must neverbe stored on edge or leanedupright.

Bison Panel should bestored under cover in drysurroundings. Supportsshould be placed at regular intervals and in sufficientnumbers according to the panel length, to avoid anydeformation.

9

Working

with

Bison Panel

Tools

Working with Bison Panel islike working with any otherparticle board - Fastening isdone in the same way as anyother boards. No special toolsare required.

However for large volumes ofcutting work, an electric powersaw is recommended. A Powersaw 1500 w - 4000 rpm with ablade of 250 mm dia providedwith straight set teeth andtungsten carbide tips is idealfor use.

Similarly a hand held electricdrill with high speed steel bitswill be faster to work.

10

Fixing

Bison Panel can be fixed totimber or steel supports. Thincold roll formed steel sectionin the form of studs and tracksare available in the market.They can be used withadvantage for applications likepartitions, false ceilings, floorsetc.

The boards must be supported in all four edges and atintermediate positions at centres not exceeding 610 mm.The board joints should occur on the centre supports.

Rust proof fixings should be used for all external applicationsor when conditions of high humidity and dampness areexpected.

Nails

Bison Panel upto 8mmthick can be naileddirectly to timbersupports with roundwire nails. For boardsover 8mm thick, a pilothole of 0.8 times thenail diameter must bepredrilled. The nail length should be approximately 3 timesthe thickness of the board.

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STEEL TIMBER

Screws

Two types of screws will be available inthe market - the wood screws and theMetal screws.

The wood screws are used for fixingBison Panel to wooden supports. A prehole of 0.8 times thediameter of the screw shank shall be provided in the Panelbefore screwing. In case countersinking of head is necessary,slightly oversize hole can be drilled to required depth. Thelength of the screws shall be 2.5 to 3 times the thickness ofthe board.

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Regarding metal screws, fullythreaded self tapping typescrews must be preferred. Thesize of the screws will beaccording to thickness of theboard and the guage of framing.Predrilling of the board is a must.The length of the screws shall be2 to 21/2 times the thickness ofthe board.

Fixing Points

The recommended fixing distancebetween two fixing points around theperimeter is 200 to 300 mm. Thefixing distance between two fixingpoints in the intermediate support is300 to 600 mm.

The fixing point has to be 15 mm(Minimum) away from the edge of theboard. Similarly the fixing point shallbe 40 mm away from the corner ofthe board.

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Board Recommended Spacing of Inter-thickness edge distance edge fixing mediate

A B C

6 - 12 mm 12 - 15 mm 200 mm 400 mm

16 mm 20 mm 300 mm 500 mm

20 mm 20 mm 400 mm 600 mm

Screws for sideways

Whenever screws are to be driventhrough the thickness of the board,the following points shall be noted.

● Side screwing is notrecommended for boards of 12mm and below thickness.

● The diameter of the screw shank shall not be more thanone fourth the thickness of the board

● Screwing shall be done in the centre line of the thickness.

● A pilot hole shall be provided in the board.

● The depth of penetration into the board shall be 21/2 be 3times the thickness of the board.

Jointing

Bison Panel is subject to slightdimensional changes due tovariations in temperatures andrelative humidity of air. Provisionshould be made in the joint byallowing a gap of 2 to 3 mm. Thegaps can be left as seams orsealed with cover strips as thecase may be.

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Binding

Bison Panel has an alkalinity pH value 11 to 13. So alkalineresistant glues or adhesives are to be used for binding thepanel. Please refer to adhesive manufacturer ’sspecifications.

Painting

Bison Panel can be coated withany kind of paint includingdistempers, Acrylic resins, Acrylicemulsions, Epoxy systems,Polyurethanes and most otheralkali resistant Paints. The board hasto be given a primer coat with cementprimer / wood primer before applying decorative paints.

All kinds of boards will show a tendency to warp whenexposed to unequal conditions, i.e. when one face iseffectively sealed and the other face is left free. To avoidthis, the other face must also be treated with a coating ofequivalent effect in order to balance the board againstwarping.

Painting should be done when the board is completely dryand atmospheric humidity is dry. Whenever the board issubjected to different humidity conditions, the absorption orrelease of moisture in the board is very slow. Hence aminimum of 48 hours will have to be allowed to attainmoisture equilibrium in the board.

Painting is not recommended when the moisture in the boardis more than 12%, particularly in case of impermeable paints.

15

SPRAY

ROLLER BRUSH

Laminations

Bison Panel can be used for cold pressing or low temperaturelaminating. The surface of the board can take wood veneer,PVC, foils, melamine laminate and paper over lay etc. Priorto lamination, the board should be acclimatised for atleast48 hours before providing decorative laminates. It shouldalways be balanced by applying a compensating laminateon the other side. To control absorption of adhesive, thesurface of the board may need to be primed with a dilutionof the adhesive.

Tiling

Ceramic tiles can be fixed toBison Panels with alkali resistantelastic tile adhesive. Refer to thetile adhesive manufacturer’sspecifications. The tile joints willhave to be provided with analround gap of 2 mm and thegaps should be filled with anelastic sealent.

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CAN BE TILED ANDLAMINATED

PartitionsThe excellent qualities of fireresistance and acoustic insulationapart from natural resistance toweather, fungus, termite and verminattack, makes the Bison Panel anideal choice for partitions, inresidential, commercial, industrialcomplexes and public buildings.

Bison Panel is an ideal material for many types of dry wallpartitions including double skin, single skin, with steel andtimber studs. These partitions are light in weight andeconomical.

Steel Studs

Steel stud partitions arevery light and providehighvalues of fireresistance and soundinsulation.

The basic system can beadopted to achieve upto 4hours fire rating by theincorporation of thermal insulation materials and by providingvarious thicknesses of Bison Panel.

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A typical partition wall isconstructed by conventional studand track method, which is knownto most of the carpenters.

Galvanised steel studs (C section)48 mm x 35 mm & 8 mm lip or 70mm x 35 mm & 8 mm lip withsuitable tracks (channel sections)are available in the market.

The tracks are fixed to the floor andceiling by means of masonary nailsor screws.

The vertical studs are cut to sizeand fitted (gripped) between the topand bottom tracks at 610 mmcentres.

The length of the stud shall be 2 to 3 mm shorter to allow forexpansion. When the partition is constructed betweenmasonry walls, the starter stud and end studs will be fixed tothe walls by screws spaced at 400mm centres. The Board isfixed on the studs with a gap of 2 to 3 mm to allow forexpansion.

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Openings

Openings required for doors and windows are marked onthe studs and blockouts left while fixing the boards. Uponcompletion of board fixing, the doors and window framesare fixed with screws.

Board Fixing

The boards are cut slightly shorterthan the over all floor to ceilingheight. The board fixing iscommenced from a fixed point witha full width board on the outside.

The board is fixed around theperimeter with self tapping selfembedding screws fixed at400mm centres duly maintainingminimum edge clearance.

The board is not fixed to intermediate studs until the boardson the other side have been fixed into place. This is to allowfor adjustments to suit the width.

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The process is continued till one side of the partition wall iscomplete. Wherever openings occur, the boards are cut tosuit the frame of the opening. The installation of all servicesare completed at this stage.

Then the other side of the system is started with a board cutto half width. (This will ensure staggering of the vertical jointsof inside and outside boards). Boards are fixed to the metalstuds as previously described. The securing of the boardsto the intermediate studs can now take place usingrecommended fixing centres.

Services

The vertical studs are normally provided with slots for runningservice lines.

When services are to be installed within the system, care istaken to ensure that fire resistance and sound insulationperformance are not impaired.

Jointing

The grooves in the joints can either be painted neatly orcovered with metal or plastic tee sections. In case flush jointsare required, the following procedure is to be adopted usingproprietary jointing compound.

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Flush Joints

The board should be fixed with a‘gap’ of 1-2 mm and in any case notexceeding 3 mm. Edges of the BisonPanel should be recessed to a widthof 70 mm and a depth of 1.5 mm -2.0 mm.

Ensure the moisture content of BisonPanel is within the statedspecification of 9% + 3% beforejointing commences. Use only theAlltek jointing/scrim materials andproceed as follows :

1. Lightly sand cut edges of boards to remove wood flakesand other irregularities. Apply an oil based alkalineresistant primer to the recess and immediate surrounding,say 2-3” either side of surfaces of boards which are to bejointed. - Allow to dry.

2. Apply a thin layer of ‘Alltek flex’ to joint areas and embeda layer of the 65 mm wide ‘Jointing scrim’ by coveringwith a further layer of ‘Alltek flex’. Allow to dry for 24 hours.For better results leave it for 4 or 5 days.

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3. Apply a full coat of ‘Alltek flex Fine’ to joint and level off ina manner to leave slightly ‘Proud’. Allow to dry for 24 hoursand sand down to a flat smooth surface level with boards.

4. Nail and screw heads should be ‘spotted’ i.e. theimpression over the heads should be filled flush with theboards surface. This is done with one or two applicationof the ‘Alltek Flex Fine’ filler.

Dwarf Partitions

Double skin dwarf partitions areeffective space dividers for workstations in offices and commercialbuildings.

In the absence of the top fixing,the stability of the dwarf partitions depends only on thestrength of bottom track. Hence the bottom track isstrengthened either by using higher thicknesses of tracks orby stuffing the tracks with wooden scantlings. Anchoring tothe floor is with deep screws and plugs spaced at closerintervals (300 mm).

Timber studsTimber studs can be used in place of steel studs. In this case theframes are first assembled on the ground and then fixed betweenthe floor and the roof. Boards are fixed only after completing theframe work.

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Single skin Partitionswith Timber studs

Single skin partitions withBison Panels provide an easyand economical answer to thedivision of space in basicbuilding.

Bison Panels in 610 mmwidths are supported in atimber frame which is fixedbetween floor and ceiling. Thepanels are retained by timberbeadings screwed to theframe work. Bison Panel 10mm or 12 mm thick willnormally be suitable incombination with a frame of75 mm x 38 mm timbersection with 25 mm x 20 mmbeading.

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24

Thermal Properties

Advantages of Bison Panel Partitions

● They are highly fire resistant, fire rating upto 4 hours ispossible with suitable construction arrangement.

● Good sound proof.

● Moisture & Weather resistant

● Termite proof

● Economical, durable & element.

Thickness Thermal Head Criticalof Bison Resistance Transmission Value of FirePanel R:M2k/W Co-efficient Resistance

K:w/m2R in Hours

6 mm 0.0231 3.722 -

8 mm 0.0308 3.666 0.07

10 mm 0.0385 3.565 0.15

12 mm 0.0461 3.471 0.21

16 mm 0.615 3.295 0.31

20 mm 0.769 3.136 0.38

40 mm 0.1538 2.527 0.61

PARTITION SYSTEMSFIRE RATING AND SOUND REDUCTION

25

10 mm Bison Panel each side of 75 mm x50 mm timber Studs at 610 mm centreswith 25 mm thick Fibre Glass (12 kg/m3) tocavity :- 1/

2 hour : 44dB at 100 - 3150 Hz.

16 mm Bison Panel each side of 75 mm x50 mm timber studs at 610 mm centres :-1/2 hour : 45dB at 100 - 3150 Hz.

12 mm Bison Panel each side of 75 mm x50 mm timber studs of 610 mm centres with40 mm thick Rockwool (43 kgs/m3) to cavity:- 1 hour : 46 dB at 100 - 3150 Hz.

16 mm Bison Panel each side 75 mm x 50mm timber studs at 610 mm centres with40 mm Rockwool (43 kgs/m3) to cavity :-11/2 hours : 47 dB at 100 - 3150 Hz.

As above but with 75 mm rockwool (43mgs/m3) to cavity :- 2 hours : 47 dB at 100- 3150 Hz.

Two layers of 10 mm Bison Panel each sideof 100 mm x 50 mm timber studs at 610mm centres with 100 mm thick Rockwool(60 Kgs/m3) to cavity :- 4 hours : 48 dB at100 - 3150 Hz.

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10 mm Bison Panel each side of 48 mm x 32mm Galvanised steel studs at 610 mm centresfaced with 100 mm x 10 mm Bison Panel stripswith 25 mm thick Fibre Glass (60 kgs/m3) tocavity 1/2 hours : 45 dB at 100 - 3150 Hz.

Steel Studs

Two layers of Bison Panel outer 12 mm andInner 20 mm each side of 146 mm C stud boxedwith 18 mm x 120 mm fillet at 610 mm centreswith 100 mm Mineral wool *85 kgs/m3) to cavity:- 4 hours : 55 dB at 100 - 3150 Hz.

16 mm Bison Panel each side of 70 mm x 32mm Galvanised steel studs at 610 mm centresfaced with 100 mm x 20 mm Bison Panel stripswith 2 layers of 50 mm thick Rock wool (60 kgs/m3) to cavity :- 21/2 hours : 53 dB at 100 - 3150Hz.

16 mm Bison Panel each side of 48 mm x 32mm Galvanised steel studs at 610 mm centresfaced with 100 mm x 16 mm Bison Panel stripswith 50 mm thick Fibre Glass (60 Kgs/m3) tocavity 11/2 hours : 53 dB at 100 - 3150 Hz.

12 mm Bison Panel each side of 48 mm x 32mm Galvanised steel studs at 610 mm centresfaced with 100 mm x 12 mm Bison Panel stripswith 50 mm thick Fibre Glass (60 kgs/m3) tocavity 1 hour : 52 dB at 100 - 3150 Hz.

DoorsBison Panel is excellent for doors andwindow shutters. It is durable andeconomical. The board is used both aspanel inserts and as flush doors. In doorshutter making the following guidelineswill help to get best results.

As panel inserts

Bison Panel 8 mm, 10 mm and 12 mmare used as panel inserts depending onthe size of the door.

A thickness equal to 3 to 3.5 times the thickness of the panelinsert is recommended for the wooden frame. This will ensuresufficient thickness of wood on either sides of the grooves.Ofcourse, the section used for the main frame also dependson the size of door shutter.

The depth of the grooves for the panel inserts shall be 1.5times the thickness of the panel insert. While inserting thepanel in the groove, a depth of 1 to 1.5 mm is left free fortaking care of expansion in the board if any.

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The size of the groove should be just as much required forthe tight fit of the panel.

The panel inserts shall be deep primed with a coat of primerpaint in dry condition.

Lamination if any shall be provided on both sides of the panelinserts.

As Flush Doors

Bison Panel 16 mm thick with lippingcan be directly used as door shutters.The lipping can be either with steel,timber or plastic.

When butt hinges are used woodenlipping provided for the board shall beas thin as possible to ensure maximumdepth of penetration of screw into theboard.

In case of light guage steel lipping,channel sections shall be preferred.This will protect the sharp edges of theboard during misuse of the doorshutter. Lip fixing shall be by screws,nails and also by glue.

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Surface hinges or Tee hingesare preferred for Bison Panelshutters. However in case butthinges have to be used, thescrew holes of the hinges shallbe located in the centre line ofthe thickness of the board.

The screws shall be as thin aspossible (dia not exceeding25% of the thickness of theboard) and the length of thescrew shall be sufficient toallow a minimum depth ofpenetration i.e. 2 to 2.5 timesthe thickness of the board.

The board shall be deepprimed either with cementprimer or wood primer.

When laminated or finishedwith emulsion paints, sametype of decoration shall begiven on both sides of theboard.

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Fire Doors :

Bison Panels has an intrincic fire resistant property, havinga thermal conductivity of 0.25 Kcal/Hr/0C/M. This property can betechnically utilised in themanufacture of Fire ResistantDoors.

Half an hour fire resistant doorswith Bison Board have beensuccessfully tested at the CentralBuilding Research InstituteRoorkee. Shutter Frame is madeout of hard wood with top, bottom,middle & intermediate rails and twovertical members, providing an air gap of about 25 mm. BisonPanels 12 mm thick, protected with a special coating arefixing on either side of the shutter frame.

Door Frame is also made of hard wood suitably painted witha special coating alround. Shutter is hung with 4 hinges fromthe door frame.

Doors to cater to fire rating up to 1 hr also can bemanufactured from Bison Panels, with special insulatingmaterial mats filled in the core.

These doors are very cost effective as compared to any otherfire resistant doors.

For further details, please contact the technical cell of NCLIndustries Limited, Hyderabad.

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False Ceilings

31

The ceiling system adopted for Bison Panel is the usualsuspended ceiling system which has gained popularity inthe building industry. The usual methods adopted for anyother suspension ceiling also will hold good for the BisonPanel.

The thickness of the Bison Panel for false ceiling can be 6mm or 8 mm depending on the requirement of thermalcomfort.

The false ceiling can be either ‘T’ grid type or flush jointedtype. In either case the longitudinal supports shall be spacedat 610 mm intervals and cross supports at 610 mm or 1220mm centres.

Grid System

32

● Grid can be made either with steel or aluminium Teesections or with timber with suitable wall line supports.The suspension arrangement can be with G.I. wires ofadequate guage taken to required level from the sofit.

● Bison Panels 6 mm and 8 mm thick are recommendedfor false ceilings.

● The grid shall be 610 x 610 mm or 610 x 1220 mm (2’0 x2’0 or 2’0 x 4’0.)

● NCL supplies prepainted Seccolor T-Sections for gridframes. The size is 30 x 35 mm - rolled with 0.5 mm thickG.I. sheet. They come in a kit form comprising oflongitudinal runners, cross bits and junction components.

● In case, Aluminium T-sections are used for the grid, theminimum thickness of the section shall be 1.2 mm andsize 30 x 35 mm.

● Suspenders can be either 8 swg G.I. wire or 0.7 x 12 mmG.I. flats. They are available in the market as coils.

● The maximum distance allowed between suspenders inlongitudinal direction and cross direction is 1220 mm or4’0. Closer intervals may be adopted depending on thesofit conditions.

● It is necessary to introduce a turn bucklein the suspender for easy and fasterlevelling of the grid. Ordinary G.I. J-boltcan serve as turn buckle.

● It is important to fix wall rest perfectly level, as the level ofthe entire grid depends on thelevel of wall rest.

● In areas where change inhumidity and temperature areappreciable and frequent, it isdesirable to provide a lock pinon the top of the panels toensure structural integrity of the grid and the panel. Thelock pin can be either a headless nail or a screw takenacross the web of the Tee section (please refer sketch).

This will avoid lifting of the Board in the grid due to thermalexpansion that may take place in the material of the gridor the Board.

● Wherever the lighting points occur, extra suspenders willhave to be provided to take the load of the outfits.

● The panels will have to be painted in dry condition onboth sides and the ends in particular before inserting themin the grid.

● A clearance of 1-2 mm shall be given between the boardand the grid on all sides for taking care of thermalexpansion if any.

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Floorings

34

Bison Panel is the first choice,in many countries, as analternative to wooden flooring,to suit different climaticconditions - as a thermalinsulating floor, as a coveringfor under floor heatingsystems, hollow flooring,floating floors and mezzanineflooring.

For application as basicflooring, the followingguidelines are recommended:

1. The minimum thickness forflooring shall be with 16 mm panels.

2. The supporting rafters are to be spaced at 610 mm centreto centre or less. The edges of the boards are to be fullysupported and fixed to rafters with screws at 400 mmcentres. Oversize holes are to be drilled into the boardfor allowing expansion.

3. The supporting rafters should be of non twisting type, sincethe screws may be forced out by continuous traffic loads.Curved and round supports are not permitted.

4. No gaps need be given for board joints. They can be fixedflush. But, a gap of about 10 to 15 mm must be left on theperiphery of the floor next to walls to allow for expansion.The gap can be concealed by a skirting board.

5. When laid, the boards should be staggered lenghwisepreferably by half their length, but atleast by a third oftheir length from row to row, it does not matter whetherthey are laid on supports or fully floated.

6. The joint between the boards must always be positionedover a support. In addition to screwing, it is better to bondthe joints, with alkaline resistant adhesives as this willhold the panels more firmly together and increase overallrigidity.

7. In order to avoid creaking, the edges will have to beprovided with tongue and groove.

8. The choice of either steel or timber supports dependsmainly on the thermal insulation, fire rating and soundinsulation requirements.

9. The boards may be deep primed with a coat of primerand kept in dry condition. If damp boards are used forflooring, the water vapour will collect and will cause thefloor coverings (PVC etc) to become loose from theboards.

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Floor Coverings

Bison Panel is basically restricted to dry floor applicationsHowever occasional wetting will not pose any seriousproblems. The flooring can be finished with many kinds offloor coverings like tiles, PVC coverings, etc.,

Carpets

Carpets made of synthetic fabrics, coir and jute can be usedon Bison Panel flooring. When synthetic fibre carpets withan underside coat of impervious material is used, the boardin the reverse side should be balanced with an appropriatecovering.

Decking

Bison Panel is ideal for Duct covers, Decking for CatwalkBridges, Decking for operation platforms, Planking for steps,Parquet floors, Dance floors, Attics etc.,

Working loads

The working loads for different thickness of Bison Panel aregiven in the following table. As 610 mm is recommended asoptimum span, loads corresponding to 600 mm may beadopted. The values given under L/300 corresponds to safeloads allowing a deflection of 1 in 300 in the board.

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37

Thickness Span 2 to 3 Multiplein mm in mm supports supports

L Max load L Max Load L

Kgs/Sq.M 300 Kgs/Sq.M 300

10 mm 300 267 148 333 185400 150 63 188 79500 96 32 120 40600 66 19 83 24

12 mm 300 391 278 457 457400 220 117 257 257500 141 60 164 145600 174 83 203 199

16 mm 300 697 659 812 812400 392 278 457 45500 251 143 293 293600 174 83 203 199

20 mm 300 1088 1088 1269 1269400 612 543 714 714500 392 278 547 457600 272 161 317 317

30 mm 300 2411 2411 2812 2812400 1356 1356 1582 1582500 868 865 1012 1012600 603 539 703 703

40 mm 300 2720 2720 3182 3182400 1625 1625 1909 1909500 972 960 1142 1142600 680 635 795 795

BISON - MULTI PURPOSE BOARD

Bison Panel has innumerable applications -internally, it can be used in all places wherean ordinary particle board can be used, forexample :- Partitions, False Ceilings, Doors,Wall Cladings, Flooring, Kitchen Platforms,Table tops, Stair Cases, Louvers, Cabinets, Cabins and manymore.

Recommended Thickness

Application Panel thickness in MM

6 8 10 12 16 20 30 40

Partitions - - - - - -

Fire Rated - - - - - - - -

Partitions - - - - -

Wall cladings - - - - -

False Ceiling - - - - - -

Facia Panels - - - - -

Floors - - - - -

Almirah Planks - - - - -

Furniture - - - -

Sign boards - - - - - -

Doors - - - -

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Panel HouseswithBison Panel

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Bison Panel is extensively usedin countries abroad as the chiefmaterial for the construction ofpanel houses for dwellingpurpose. The board is used forwall construction aswell as the inside layerof the roofs.

NCL has developed most innovativesystems, suitable to Indian conditions,for the construction of prefabricatedpanel houses using Bison Panels.Hundreds of houses were supplied tomany prestigious customers in thecountry in private and public sectors.

Typical plan andElevation of a PanelHouse assembled with2’ (610 mm) width wallpanels.

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The models include Farm Houses, Dwelling Houses, RowHouses, Project Houses, Custom made Houses, RestHouses, Guest Houses, Hill Resorts, Store Sheds, PentHouses, Security Cabins, Mobile Check posts, IndustrialSheds, Disaster Housing, Defence Barracks, SchoolBuildings and many more.

Wall panels are made usingcold roll formed steel profilesspecially developed by NCL.The ‘S; shaped profile and ‘W’shaped profiles are used formaking the panel walls in singleskin and double skinrespectively. Same profiles arealso used for the assembly ofroof sheets in single skin anddouble skin.

The construction technique issimple. First, a thin channelsection frame (Ground track) isfixed on a level base withscrews and plugs. The trackframe will be as per the planconfiguration of the shelter.Bison panels fitted with steelprofiles are then inserted in thetrack frame vertically by

interlocking the joints of the panels to form a continuouspanel wall.

Specially designed postsare provided for the walljunctions and the corners.During erection, the wallpanels are held in positionby providing temporaryprops or supports. Uponcompletion of the wallpanels, another channelframe (top track) is fixed

on the top of the panel walls to keep the wall panels tight inposition. The top track also helps to distribute the roof loaduniformly on the wall panels. Special panels and ready fitframes are used for doors and windows.

Light weight trusses and purlins are fixed on the top trackwith specially designed components. Roof sheets are thenspread on the purlins duly interlocking the panels as wasdone in the case of wall panels. Roofs can be either gabletype or pitched type. A roof coat is given to the panels toprevent leakages.

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NCL Prefab Houses have the following advantages :

● The houses are made in small components, easy fortransportation to difficult terrains.

● As the structures are light they require very littlefoundation. They can be erected on any firm base or onstilts.

● The erection is simple and fast and requires no high skills.

● These shelters can be dismantled and reerected at adifferent place if required.

● As the structures are light they are safe in earth quakeprone areas.

● Prefab shelters help to provide instant accommodationwith better living conditions in projects and othertownships.

● They are comfortable, durable and affordable.

The profiles and components required for panel housemaking are available only with NCL. Contact NCL for thesupply of Prefab shelters or Technical Guidance.

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COMPARISON OF STANDARDS OF“CEMENT BONDED PARTICLE BOARDS”

S. Name of ISO (8335) B.S.I. Bison DIN Bison PanelNo. TheProperties 1987 Bs 5669 Standards (Present

Part 4 result)1989

DIMENSIONAL TOLERANCE :

1. Length (mm) + 5.0 mm + 5.0 mm + 5.0 mm + 5.0 mm

2. Width (mm) + 5.0 mm + 5.0 mm + 5.0 mm + 5.0 mm

3. Thickness (Unsanded) :6 mm to 15 mm 6 to 12 mm 6 to 15 mm 4 to 10 mm 4 to 10 mm

+ 1.0 mm + 0.9 mm + 0.7 mm + 0.7 mm

16 to 27 mm 12 to 20 mm 16 to 27 mm 12 to 20 mm 12 to 20 mm+ 1.5 mm + 1.2 mm + 1.0 mm + 1.0 mm

28 to 40 mm 20 to 40 mm 28 to 40 mm 22 to 40 mm 22 to 40 mm+ 2.0 mm + 1.7 mm + 1.5 mm + 1.5 mm

Thickness (Sanded) :

All thicknesses in mm + 0.3 mm + 0.4 mm + 0.3 mm + 0.3 mm

4. Edge Straightness + 1.0 mm 1/1000 mm/mm + 3.0 mm + 3.0 mm (mm/mm)

5. Squarness + 2.0 mm 2/1000 mm/mm + 2.5 mm + 2.5 mm

MECH. CHARACTERISTICS

1. Density (Kg/m3) Not less than 1250 + 10% 1250 + 101000 kg/m3 kg/m3 (Not kg/m3 (Not

less than less than1200 kg/m3 1200 kg/m3

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2. Bending Strenghts Min. 9.0 Min 10 Min. 9 Upto 12 mm(Modulus of rupture) N/mm2 N/mm2 N/mm2 11.0 to

12 N/mm2

Upto 16 to 25 mm10.5 to 11.5 N/mm2

Upto 30 to 40 mm9 to 10 N/mm2

3. Modulus of Elasticity 3000/N/mm2 4500 N/mm2 Min 3000 Min 3000(MDE) N/mm2 N/mm2

4. Swelling in thickness % 2% 1.5% to 1.8% Max. 1.5% 0.5 to 1.0 %24 hours after immersion

5. Tensil strength (Perpen- - Min 0.45 Min 0.4 0.6 to 0.9dicular to the Surface) N/mm2 N/mm2 N/mm2

6. Moisture (%) 6 to 12 % 6 to 12 % 6 to 12 % 7 to 11 %

7. Screw Holding (N)a) Surface _ _ Min 1250 N1250N to 1600N

b) Edge - 450N Min 850N Min 1200N

8. Impact Strength Record 20 mm/mm Min 18.0 22-25mm/mm mm/mm mm/mm

BISON PANEL : VOLUME & WEIGHTThickness Volume per board Weight per board

(8’ x 4’) (10’ x 4’) (8’ x 4’) (10’ x 4’)2440 x 1220 mm 3050 x 1220 mm 2440 x 1220 mm 3050 x 1220 mm

(Cu. mtrs) (in Kgs)

6 mm 0.0179 0.0223 23.22 29.028 mm 0.0238 0.0297 30.95 38.6910 mm 0.0297 0.0372 38.69 48.3612mm 0.0357 0.0446 46.43 58.0316 mm 0.0476 0.0595 61.90 77.3820 mm 0.0595 0.0744 77.38 96.7330 mm 0.0892 0.1116 116.06 145.0840 mm 0.1190 0.1488 154.75 193.44

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COMPARISON OF PROPERTIES OF BOARDS

S. Particulars Bison Particle Plywood MDF AsbestosNo. Panel Board

1. BendingStrength 12-13 12-13 60-64 22-25 5-6(N/MM2)

2. TensileStrength 0.8-1.0 0.6-0.7 0.7-0.8 0.5-0.7 -(N/MM2)

3. Swelling 1.0 15-20 4.5 15 0.524 Hrs. (%)

4. Water 27 50-70 30-33 18 -Absorption24 Hrs. (%)

5. Screw Holding 2000 1500 1200 1500 -on Face N

6. FireCombustibility Virtually Easily Easily Incom- Incom-Ignitability, Incombus- Combus- Combus- bustible bustibleFlame Spread tible tible tible

7. Insect Highly Vulner- Vulner- Vulner- HighlyAttack Resistant able able able Resistant

8. Fungus Highly Vulner- Vulner- Vulner- HighlyAttack, Resistant able able able Resistant

9. Health, No Toxic Liberated Liberated Liberated Carcino-Safety, Gases Toxic Toxic Toxic genic

Gases Gases Gases

10. Painting Excellent Very Poor Poor Excellent Very PoorFinish Finish Finish Finish

11. Lamination Possible Possible Possible Possible NotPossible

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BISON PANEL - PRECAUTIONS

1. HANDLINGCarry the Panel vertically as the Panel may break due to sag and swing ifcarried horizontally. Do not lift the board when it is wet.

2. STORINGStack the boards flat on a level ground or on level supports to avoid bendingof the boards due to self-weight.

3. EDGE SUPPORTSWhile fixing the board on a frame work all the edges of the board are to befully supported. Unsupported edges may chip off.

4. NAILING/SCREWINGDrill a Prehole 0.8 times Dia before Nailing or Screwing to avoid local cracks.

5. EDGE CLEARANCENail holes shall be away from the edge of the board by a minimum of 12 mmand away from the corner by a minimum of 40 mm

6. EDGE SCREWINGScrewing through the thickness of the board is not recommended for Boardsless than 12 mm thick.

7. FIXINGFix the Panels on flat frame. Do not fix on curved surfaces like pipes.

8. PAINTINGBison Panel can be painted with variety of paints. Apply a cement primer/wood primer coat before painting. Do not paint in wet conditions and ensurethe board is dry before Painting.

9. BALANCINGWhen one side of the board is painted or laminated, the other side also requirespainting / lamination to arrest warping in the board.

10. JOINTSWhenever the board is cladded on a frame work; board joints shall have aminimum gap of 2 mm to take care of the expansion in the board.

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22, Govt. Servants Co.op.Housing SocietyBehind Municipal Market,NavrangpuraAHMEDABAD - 380 009Ph : 6427599

S-2 Richmond PlazaRichmond Circle 10/1,Raja Ram Mohan Roy RoadBANGALORE - 560 025Tele Fax : 2234858, Ph : 2244449

Dynamic CentreMP Nagar, Zone IBHOPAL - 462 001Ph : 555473 (PP)/581116 (PP)

Plot No. 112Shahid NagerBHUBANESWARPh : 408602

Jogani Indl. ComplexBldg. No.5, gala No. 6V. N. Purav Marg, ChunnabhattiBOMBAY - 400 022Ph : 5230066

C/o. Prakash Sales CorporationBF-7 Sector - 1, Salt Lake CityCALCUTTA - 700 064Ph : 3379907

White House, C.No. 10 & 11Sector - 26, SCO-30, 2nd FloorMadhya Marg

CHANDIGARHPh : 770984

C/o. General Agencies Corpn.XL/3550 Basin roadErnakulamCOCHIN - 682 035Ph : 351811/349516

205, Sri Krishna Towers525, Dr. Nanjappa RoadGandhipuramCOIMBATORE - 641 018Ph : 233084/235134

C/o S.K. Hardware & PaintsPlot No. 68, Attigeri Bldg.New Cotton MarketHUBLI - 580 029Ph : 50294

C/o. Shree Shanti EnterprisesA-5, Rishi MarketOpp. Palasia Thana, A.B. RoadINDORE - 452 008Ph : 432218

C/o. Garg TradersFaizabad Road, Nr. PolytechnicIndiranagarLUCKNOW - 226 016Ph : 384680

Precision PlazaGround Floor281, Anna Salai, TeynampetMADRAS - 600 018Ph : 458206/458207

Regional Offices

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C/o Shyam Trading Co.Nr. Mohta SadanHansapuriNagpur - 440 018Ph : 726412

B-87, Defence ColonyNEW DELHI 110 024Ph : 4627197/4618320Fax : 4645896

16 C/o N.S. Bhale Rao1103/A/14Gurukripa Model Colony

PUNE - 411 016Ph : 352699

C/o Divya Sai AssociatesShop No. 5, Church ComplexNirmala Covent RoadVIJAYAWADA - 520 010Ph : 477833

50-40-16/1TPT COLONY, Nr. GurudwarSeethamma DharaVISAKHAPATNAMPh : 543533

Prepared by : Technical Cell - NCL

Cement Bonded Wood Particle Board is popular in manycountries around the Globe. The board is marketed by differentbrand names. For example - Bison Board - China ; Viroc - France; Duripanel - Germany ; Betonyp - Hungary; Bison Panel - India; Golden board - Japan ; Cemboard - Malaysia, Mexi board -Mexico ; Pyrok - U.K. There are over 200 plants manufacturingthis board in 30 countries in the world.

All instructions and technical information and drawings are in accordancewith the present state of the art relating to BISON PANEL, unless otherwisespecified and with our experience based thereon. The applications describedare simply intended as illustrations and make no allowance for specialconditions which may exist in a special case. Detailed plans must be agreedin the light of the particular project concerned and must always be checkedon site. NCL industries accept no warranty for this information, includingprinting errors and subsequent amendments of technical information.

NCL INDUSTRIES LTD.Raghava Ratna Towers, Abids, Hyderabad - 500 001Tel : 203637, 202548, Telex : 0425-6887 NCLH INGrams : ENCIELIND Fax : 91 (040) 202496/203417