Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 15786 (2008): Prelaminated cement bonded particle board-Specification [CED 20: Wood and other Lignocellulosicproducts]

IS 15786 : 2008

Indian Standard

PRELAMINATED CEMENT BONDED PARTICLEBOARD - SPECIFICATION

ICS 79.060.20

© BIS 2008

BUREAU OF INDIAN STANDARDSMANAK BHA VAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

June 2008 Price Group 4

Woodand Other Lignocellulosic Products Sectional Committee, CED 20

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Wood andOtherLignocellulosicProducts Sectional Committee had been approved by the Civil Engineering Division Council.

Prelaminated cement bonded particle board is a cement bonded particle board laminated on both surfaces bysynthetic resin impregnated base paper under the influence of heat and/or pressure or with finished foils underthe influence of pressure or pressure and heat depending upon the type of binder. As the prelaminated cementbonded particle boards are being manufactured and used extensively, the need for this standard was felt forguiding the manufacturers and the users.

This standard classifies prelarninated cement bonded particle boards into three types depending upon the abrasionresistance of the prelarninated surface. Type I board is useful for horizontal applications like flooring, cashcounters, restaurant table tops, etc. Type II board is useful for normal horizontal applications like office tabletops, domestic furniture tops, etc. Type III board is useful for vertical applications like panelling, partitioning andfor false ceilings.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance withIS 2 : 1960 'Rules for rounding off numerical values (revised)' . The number of significant places retained in therounded off value should be the same as that of the specified value in this standard.

IS 15786 : 2008

Indian Standard

PRELAMINATED CEMENT BONDED PARTICLEBOARD - SPECIFICATION

1 SCOPE

Thi s standard covers the requirement of prelarninatedcement bonded particle boards for general purpose andfor special applications.

classifiedon basis of the surface abrasion characteristicsspec ified in Table I , SI No. (vi ii).

4.2 The type s of prel aminated cement bonded particleboards shall be represented by symbols as follows:

2 REFERENCES Type Designation

The standards listed in Annex A contain provisions,which through reference in this text constituteprovisions of this standard. At the time of publication,the editions indicated were valid. All standards aresubject to revision and parties to agreements based onthis standard are encouraged to investigate theposs ibility of applying the most recent editions of thestandards indicated at Annex A.

3 TERMINOLOGY

For the purpose of this standard , the follo wingdefinitions in addition to those given in IS 707 shallapply.

3,1 Prelaminated Cement Bonded Particle Board- A cement bonded particle board laminated on bothsurfaces by synthetic resin impregnated base papersunder the influence of heat and/or pressure or withfin ished fo ils under the infl ue nce of pressure orpressure and heat depending on the type of binder used.

3.2 Base Paper - A printed or plain colouredabsorbent paper normally having a weight of 50-140g1m2•

33 Impregnated Base Paper - A base paper, printedor plain coloured. impregnated in any suitable syntheticres in and dried to a volatile content of 4 to 8 percent.

3.4 OverlaylUnderlay Paper - A highly absorbenttissue paper having a weight of 18-40 g1m2•

3.5 Impregnated OverlaylUnderlay - An overlay/underlay paper impregnated in any suitable syntheticresin and dried to a volatile content of 4 to 8 percent.

3.6 Finished Foil - Synthetic resin based surfacingfilm having a weight of 40 to 100 g1m2•

4 TYPES

4.1 Prelaminated cement bonded particle board shall beof three types. namely, Type Y, Type II and Type ill

I PLCPB-IIII PLCPB-12III PLCPB - 13

5 MATERIAL

5.1 Cement Bonded Particle Board

Cement bonded particle board conforming to IS 14276and having fine and closed surface shall be used forproduction of prelarninated cement bonded particleboard.

5.2 Impregnated Base Paper

Printed or plain coloured absorbent base paper havinga weight of 60 to 140 g/m", impregnated in a suitablesynthetic resin and dried to a volatile centent of 4 to 8percent shall be used for prelamination of both surfacesof cement bonded particle board.

5.3 Impregnated OverlaylUnderIay

An absorbant tissue paper, having a weight of 18 to 40g1m2, impregnated in a suitable synthetic resin and driedto a volatile content of 4 to 8 percent shall be used inthe manufacture of prelarninated cement bondedparticle boards.

5.4 Finished Foil

Synthetic resin based surface film having a weight of40 to 100 g/m2 with one of the face s fully finishedshall be used in the manufacture of prelaminatedcement bonded particle boards.

6 MANUFACTURE

6.1 Cement bonded particle boards having fine andclosed surface shall be used for making prelaminatedcement bonded boards. Impregnated base papers richin synthetic resin are placed on either side of the cementbonded particle board and the assembly is taken insidea short cycle single opening lamination press or a

IS 15786 : 2008

7 FINISH

NOTE - Any other dimension (length, width and thickness)as agreed to between the manufacturer and the purchaser maybe used.

8.3 Dimensional Tolerance

The following tolerances on dimensions ofprelanimated cement bonded particle boards shall bepermissible:

The finish of the paper overlaid cement bonded particleboard depends on the surface of caul plates used.Common surface fini shes in use are glossy, matt,textured (soft . swede. wood pore and leather). etc . Thesurface finish of the foil finished boards depends onthe original finish of the foil used. 2

345710

±I±1.5±2±0 .3

2 mm/I 000 mm or 0.2percent

2 mm/I 000 mm or 0.2percent

Number of Boards to be Selectedn

Lot SizeN

Up to 5051 - 100

101 - 200201 - 300301 - 50050 I and above

Thickness:a) Un sanded boards:

6 to 12 mm12 to 20 mm20 mm and more

b) Sanded boards. forall thicknesses

Edge straightness

Squareness

9 SAMPLING AND INSPECTION

9.1 Scale of Sampling

9.1.1 Lot

In any consignment. all the prelaminated cement bondedparticle boards of the same type and dimensions. andmanufactured under similar conditions of manufactureshall be grouped together to constitute a lot.

9.1.1.1 The conformity of a lot to the requirements ofthis specification shall be ascertained on the basis oftests on prelaminaed cement bonded particle boardsselected from it.

9.1.1.2 The number of prelaminated cement bondedparticle boards to be selec ted from a lot sha ll be inaccordance with the following:

9.1.2 The pelaminated cement bonded particle boardsshall be selected at random. In order to ensurerandomness of selection. all the prelaminated cementbonded particle boards in the lot may be arranged in aserial order and every rth board may be selected tillthe required number is obtained. r being the integralpart of Nln, where N is the lot size and n is the samplesize. Alternatively. for taking the sample boards atrandom. use may be made of the random number tablesgiven in IS 4905.

9.1.3 All boards selected as given in 9.1.2, when testedas specified in IS 2380 (Part 2) for length. width.thickness. edge straightness and squareness, shallcomply with the requirements specified in 8.

9.2 Test Specimens and Number of Tests

From each of the prelaminated cement bonded particleboards selected as in 9.1.2. the following test specimens

Tolerancerom±5±5

LengthWidth

Dimension

multi-daylight press . Under heat and/or pressure theresin flows and forms a permanent bond with cementbonded particle board.

The top surface of impregnated paper comes in contactwith special surfaced chromium plates or steel caulplates and takes the impression of surface finish of thesecauls. Hot boards are extracted out of the cycle pressand cooled in air. whereas cooling of boards is doneinside the press in multi-daylight type press.

6.1.1 The impregnated overlay/underlay paper may beused by placing it over/under the impregnated basepaper (lBP) on one surface while using a normal IBPon the other surface and pressed under the influenceof heat and/or pressure. The impregnated overlaybecomes transparent after pressing. Such boards areused for high surface abrasion applications.

6.2 In case of finished foil cement bonded paricle board.the finished foil is pasted on both surfaces of cementbonded particle board after spreading a suitable syntheticglue on the board surface and passing the assembly in aroller press or a flat press under the influence ofpressureand/or heat depending on the type of binder used .

8 DIMENSIONS AND TOLERANCES

8.1 The size of prelaminated cement bonded particleboards shall be as follows:

a) Length - 3 050 mm and 2 440 mm, andb) Width-1220 mm.

8.2 The thickness of prelaminated cement bondedparticle boards shall be as follow s:

6 mm, 8 rnm, 10 mrn, 12 mrn, 16 rom. 20 mrn,25 mm, 30 mm and 40 mm.

2

shall be CUI out from portions 150 rnrn away from theedges, for tests as specified in 10.2 to 10.14 andconditioned as specified in IS 2380 (Part I):

a) For Determination of Density - Three testspecimens from each sample, in full thicknessof material, 75 mrn wide and 150 rnm long .Other sizes of test specimens may be usedwhen deemed necessary.

b) For Determination of Moisture Content -Three test specimens from each sample in fullthickness of material, 75 mm wide and 150rnm long. Smaller specimens may be usedwhen deemed necessary.

c) For Water Absorption Test - Three testspecimens from each sample in full thicknessof board. of size 300 mm x 300 mm.

d) For Swelling in Water Test - Three testspecimens of full thickness of board fromeach sample of size 200 mm x 100 mm .

e) ForDetermination ofModulus ofRupture andModulus ofElasticity - Three test specimensfrom each sample to conform to dimensionsas specified in IS 2380 (Pan 4).

0 For Determination of Tensile StrengthPerpendicular to Surface - Three testspecimens from each sample of size 50 mmx 50 mm in full thickness of board.

g) For Determination of Tensile StrengthPerpendicular to Surface After AcceleratedAgeing Test- Three test specimens from eachsample of full thickness of board of size50 mm x 50 mm .

h) For Determination of Screw WithdrawalStrength - Three test specimens from eachsample of size as specified in IS 2380(Part 14).

j) For Determination ofResistance to Abrasion- Three test specimens from each sample ofthe full thickness of board. of size of about130 mm diameter or a square of about120 mm with its comers rounded to givea diagonal of about 130 mm.

k) For Determination ofResistance to Steam -Three test specimens from each sample ofthe full thickness of board of size 100 mm xlOOmm.

m) For Determination ofResistance to Crack-Three test specimens from each sample ofthe full thickness of board of size 100 nun x100 nun.

n) ForDetermination ofResistance to CigaretteBum - Three test specimens from eachsample of the full thickness of board, of size200mm x 100 nun.

3

IS 15786 : 2008

p) For Determination of Resistance to Stain -Three test specimens from each sample ofthe full thickness of board. of size 75 mm x25 mm .

9.3 Criteria of Conformity

A lot shall be considered as conforming to therequirements of the specification, if all the samples andtest specimens pass the conditions as specified in 7and 10.

9.3.1 In case of a failure . double the samples shall betaken from the lot for testing . The lot shall beconsidered to have passed. if all these samples conformto the requirements specified in 7 and 10.

10 TESTS

10.1 The test specimens shall be tested as given in 10.210 10.14 and shall conform to the requirements asprescribed in the respective clauses.

10.2 Test for Density

The density of the prelaminated cement bonded particleboard shall be determined for each test specimenprescribed in 9.2(a) in accordance with IS 2380 (Part 3)and the average value shall not be less than I 250 kglm J

(see also Table I) .

10.3 Test for Moisture Content

The moisture content for each test specimen prescribedin 9.2(b) shall be determined in accordance withIS 2380 (Part 3) and the average value shall not exceed12 percent.

10.4 Test for Water Absorption

The water absorption shall be determined for each testspecimen prescribed in 9.2(c) in accordance withIS 2380 (Part 16) and the average value shall not exceedthe limits specified in Table I.

10.5 Test for Swelling in Water

The swelling in thickness shall be determined for eachtest specimen prescribed in 9.2(d) in accordance withIS 2380 (Part 17) for 2 h soaking in water and theaverage value shall not exceed the limit specified inTable I .

10.6 Test for Modulus of Elasticity and Modulus ofRupture

The modulus ofelasticity and modulus of rupture shallbe determined for each test specimen prescribed in9.2(e) in accordance willi IS 2380 (Part 4) and theaverage values shall not be less than the respectiverequirements specified in Table I.

IS 15786 : 2_

10.7TestforThnsiJeStrength Perpendicular to Surface

Tensile strength perpendicular to surface shall bedetermined for each test specimen prescribed in 9.2(f) inaccordance with IS 2380 (Part 5) and the average valueshallnotbeless than the values specified in Table 1.

10.8 Test for Tensile Strength Perpendicular toSurface After Ageing

Test for tensile strength perpendicular to surface shallbedetermined foreach testspecimenprescribedin 9.2(g)inaccordance with IS 2380 (Part 5) after subjecting thespecimens to the ageing test of accelerated waterresistance as prescribed in Table 1. The average valueshall not be less than the values specified in Table 1.

10.9 Test for Screw Withdrawal Strength

The screw withdrawal strength shall be determined foreach test specimen prescribed in 9.2(h) in accordancewith IS 2380 (Part 14) and the average value shall notbe less than the value specified in Table 1.

10.10 Test for Abrasion Resistance

The abrasion resistance shall be determined for eachtest specimen prescribed in 9.20) in accordance withthe method prescribed in Annex B and shall complywith the requirements specified in Table 1.

11 MARKING

11.1 Each prelaminated cement bonded particle boardshall be legibly and indelibly marked on any of itsedges/surface with the following:

a) Name of the manufacturer or his trade-mark,if any;

b) Type of prelaminated cement bonded particleboard ;

c) Thickness; and

d) Date of manufacture.

11.2 BIS Certification Marking

The product may also be marked with the StandardMark.

11.2.1 The use of the Standard Mark is governed bythe provisions ofBureau ofIndian Standards Act, 1986and the Rules and Regulations made thereunder. Thedetails of conditions under which the licence for theuse ofStandard Mark may be granted to manufacturersor producers may be obtained from the Bureau ofIndian Standards.

Table 1 Physical and Mechanical Properties(Clauses4, 10.2. lOA. 10.5. 10.6, 10.7,10.8,

10.9 and 10.10)

') Accelerated JJ'aJer Resistance Test - Specimens shall beboiled in water for a period of 2 h. Thereafter tbese shall bedried at 27 *' 2°C to a moisture content of around 12 percent andthe tensile strength perpendicular to surface determined.

10.11 Test for Resistance to Steam

The resistance to stearn shall be determined for eachtest specimen prescribed in 9.2(k) in accordance withthe method prescribed in Annex C and the specimensshallnotshowanysignof blister.delaminationor changeinsurface finish.Slight change in colour in case of darkcolours/patternsshall not be a cause for rejection.

10.12 Test for Resistance to Crack

Resistance to crack shall be determined for each testspecimen prescribed in 9.2(m) in accordance with themethod prescribed in Annex D and the specimen shallnot show any sign of crack or delamination.

10.13 Test for Resistance to Cigarette Bum

Resistance to cigarette bum shall be determined foreach test specimen prescribed in 9.2(n) in accordancewith the method prescribed in Annex E and thespecimen shall not leave any mark or stain on thespecimen after cleaning with water or solvent.

10.14 Test for Resistance to Stain

Resistance to stain shall be determined for each testspecimen prescribed in 9.2(p) in accordance with themethod prescribed in Annex F and the test shall notleave any stain on the specimen after cleaning withwater or solvent.

4

SINo.( I)

i)ii)

iii)

iv)

v)

vi)

vii)

viii)

Properties

(2)

Density. Min, kg/m 'Water absorption, Max, percent:

a) 2 hb) 24 h

Thickness swelling in water, Max,percent in 2 hModulus of rupture (MaR), N/mm2:

a) Averageb) Minimum

Modulus ofelasticity (MOE), N/mrn2:

a) Averageb) Minimum

Tensile strength perpendicular to surface,Min,Nlmm2

Tensile strength perpendicular to surfaceafter accelerated water resistance test,Min,Nlmm2 1)Screw withdrawal strength, Min, N:

a) Faceb) Edge

Abrasion resistance, Min, in number ofrevolutions:

a) Type Ib) Type IIc) Type m

Require-ments

(3)

1250

13.025.0

2.0

9.07.5

30002550

0.2

0.10

1250850

45025075

IS 15786 : 2008

ANNEXA

(Clause 2)

LIST OF REFERRED INDIAN STANDARDS

IS No. Title IS No. TItle

2794: 1979

4905 : 196814276: 1995

324 : 1959 Specification for ordinary denaturedspirit (revised)

707 : 1976 Glossary of terms applicable totimber technology and utilization(second revision)

1500 : 2005 Method for Brinell hardness test formetallic materials (third revision)

2380 Methods of test for wood particleboards and boards from otherlignocellulosic materials:

(Part 1) : 1977 Preparation and conditioning of testspecimens (first revision)

(Part 2) : 1977 Accuracy of dimensions of boards(first revision)

(Part 3) : 1977 Determination of moisture contentand density (first revision)

(Part 4) : 1977 Determination of static bendingstrength (modulus of rupture andmodulus of elasticity in bending)(first revision)

(Part 5) : 1977 Determination of tensile strengthperpendicular to surface (firstrevision)

(Part 14) : 1977 Screw and nail withdrawal strength(first revision)

(Part 16) : 1977 Determination of water absorption(first revision)

(Part 17) : 1977 Determination of swelling in water(first revision)Specification for truing/dressingtools, single diamond (first revision)

3400 (Part 2) : Methods of test for vulcanized2003 rubber: Part 2 Rubber, vulcanized or

thermoplastic - Determination ofhardness (Hardness between 10IRHD and 100 IRHD) (thirdrevision)Methods of random samplingCement bonded particle boards -Specification

ANNEXB

(Clause 10.10)

METHOD OF TEST FOR DETERMINING SURFACE ABRASION RESISTANCE

B-1 GENERAL

The test measures the ability of the decorative surfaceof the sheet under test to resist abrasive wear-throughto the sub-layer. Abrasion is achieved by rotating aspecimen in contact with a pair of loaded cylindricalwheels covered with abrasive paper. The wheels arepositioned so that their cylindrical faces are equidistantfrom the specimen's axis of rotation but not tangentialto it. As they are turned by the rotating specimen. theyabrade an annular track on the specimen's surface. Thenumber of revolutions of the specimen required tocause a defined degree of abrasion is used as measureof resistance to surface wear.

B-2 MATERIALS

B-2.1 Calibration Plates of Rolled Zinc Sheet

Calibration plates of rolled zinc plate shall have athickness of 0.8 ± 0.1 mm and a Brinell hardness of48 ± 2 when tested in accordance with IS 1500, except

5

that the ball diameter shall be 5 rnrnand the load 360 N.

B-2.2 Abrasive Paper Strips

Abrasive paper strips shall be of J2.7 mm width andabout 160mm length. having the following composition:

a) Paper of grarnrnage, 70 g/rn? to 100 g/rn- :

b) Powdered aluminium oxide having a particlesize such that it will pass through a sieve ofaperture I00 urn and remain on a sieve havingan aperture of 63 urn; and

c) Adhesive backing (optional).

B-2.3 Double-Sided Adhesive Tape

Double-sided adhesive tape shall be required only ifthe abrasive paper has no adhesive backing.

B-3 APPARATUS

8-3.1 Testing Machine - The testing machine shallconsist of the items given in B-3.1.1 to 8-3.1.5.

IS 15786 : 2008

B-3.1.1 Specimen Holder- The specimen holder shallbe in the form of a disc which rotates in a horizontalplane at a frequency of 58 rev/min to 62 rev/min andto which the test specimen can be clamped flat.

B-3.1.2 Abrasive Wheels - Abrasive wheels shall betwo cylindrical rubber-covered wheels of 12.7 romwidth and 50 romdiameter which rotate freely about acommon axis. The curved surface of the wheels to adepth of 6 rom,shall be of rubber of hardness 50 to 55TRHD when tested according to IS 3400 (Part 2). Theinside faces of the wheels shall be 50 rom to 55 mmapart, and their common axis shall be 20 romfrom thevertical axis of the specimen holder. The wheels shallbe positioned symmetrically in a plane containing theaxis of the specimen holder.

B·3.1.3 Holding and Lifting Device - Holding andlifting device for the abrasive wheels. shall be soconstructed that each wheel exerts a force of 5.4 ± 0.2 Non the test specimen.

8-3.1.4 Revolution Counter

B-3.1.5 Suction Device - Suction device shall be sofitted that two nozzels are over the abraded-section ofthe specimen under test. One nozzle shall be situatedbetween the wheels, the other diametrically opposite.The centres of the nozzles shall be 77 mm apart and1 rom to 2 mm from the surface of the test specimen.When the nozzles are closed. there shall be a vacuumof 1.5 x 10-3 N/mm 2 to 1.6 x 10-3 N/mm 2•

B-3.2 Conditioning Chamber - Conditioningchamber shall be capable of maintaining a standardatmosphere of 27 ± 2°C and relative humidity of65 ± 5 percent.

B-4 TEST SPECIMENS

Each test specimen shall be a piece of the sheet undertest, shaped to fit the type of clamping .device used. Itwill usually be a disc of diameter about 130 rnm, or asquare of about 120 mm with its comers rounded togive a diagonal of about 130 mm and having a hole ofdiameter 6 mm in its centre. Three specimens shall beprepared.

B-S PREPARATION OF TEST SPECIMENS ANDABRASIVE PAPER

Clean the surface of the test specimens with an organicsolvent which is immiscible with water. for example,I-l-l-trichloroethane. Precondition the test specimensand the abrasive strips for at least 72 h in theconditioning atmosphere (see B-3.2) before testing .

B-6 PROCEDURE

8-6.1 Preparation ofAbrasive Wheels

Bond a strip of preconditioned abrasive paper

6

(see B-2.2) to each of the rubber-covered wheels usingeither the adhesive backing, if present, or the double-sided adhesive tape (see B-2.3), in such a way that thecylindrical surface is completely covered, but withoutany overlapping of the abrasive paper.

B-6.2 Calibration ofAbrasive Paper

Prepare two abrasive wheels with unused strips ofabrasive paper from the batch to be used for testing(see B-6.1).

Clamp a zinc plate (see B-2.1) in the specimen holder(see B-3.1.1), operate the suction device (see B-3.1.5),and abrade the zinc plate for 500 revolutions. Wipethe zinc plate clean and weigh to the nearest 1 mg.Replace the abrasive paper on the wheels with unusedstrips from the same batch, clamp the same zinc platein the specimen holder, lower the abrasive wheels andoperate the suction device.

Abrade the zinc plate for a further 500 revolutions,then wipe it clean and reweigh it to the nearest I mg.The loss in mass shall be 130 ± 20 mg .

Any batch of abrasive paper which causes a loss inmass of the zinc plate outside this permitted range shallnot be used for testing.

B-6.3 Abrasion of Test Specimen

Perform the test immediately after removal of the testspecimen and the calibrated abrasive paper from thepreconditioning atmosphere.

Prepare sufficient abrasive wheels for the test usingpreviously unused abrasive paper. Fit two wheels tothe machine and set the revolution counter to zero.

Clamp the specimen in the holder. ensuring that itssurface is flat. Lower the abrasive wheels on to thespecimen, operate the suction device and allow thespecimen to rotate. Examine the specimen for wearafter each 25 revolutions and examine the abrasivepaper for clogging with abraded particles. Replace theabrasive paper if it becomes clogged. or after 500revolutions, whichever happens first. Continue the testin this way until the final wear point is reached, that is,till the particle board surface is visible in 95 percent ofthe abraded area. Record the number of revolutionswithstood by the specimen to reach the final point.

B-7 EXPRESSION OF RESULTS

The wear resistance, expressed in revolutions, for eachspecimen shall be half the number of revolutionsrecorded for the final wear point.

The wear resistance of the sample under test shall bethe average of the values obtained on the three testspecimens. rounded to the nearest 25 revolutions.

IS 15786 : 2008

C-S.3 Glass Conical Flask. 250 ml.

C-S.4 Holding Clamp

ANNEXC

(Clause 10.11)

METHOD OF DETERMINING SURFACE RESISTANCE TO STEAM

C-I GENERAL C-S.2 Electric Hot Plate. of size 200 mm diameter or200 mm x 200 mm minimum sides.

Thi s test determines the surface resi stance ofprelaminated cement bonded particle board againstcontact wih steam at atmospheric pressure .

C-2 NUMBER OF TEST SPECIMENS C-6 SETTING UP OF APPARATUSThree specimens shall be used for each test.

C-3 SPECIMEN SIZE

S:-ecimens of size 100 mm x 100 mm x thickness shallbe used.

Place the conical flask filled with water up to 100 ccon the hot plate. Cover the mouth of the conical flaskwith the specimen such that the surface to be testedshall face downwards . Put the holding clamp to securethe specimen from falling down.

C-4 PREPARATION OF SAMPLE C-7 PROCEDURE

The test specimen shall becut in the required size fromthe sample board. 150 mm away from the comer ofthe edge. The specimens selected shall have compactedges with no loose core particles.

COS APPARATUS

C-S.I This test requires very simple apparatus.

C-7.1 Start heating the water in the flask by putting onthe electric heater. After some time water will startboiling. Note the time and continuously heat for a totalperiod of2 h. Steam will come in contact with the boardsurface and escape into atmosphere .

C-7.2 Observe the surface of the specimen closely andnote down remarks in the register.

ANNEXD

(Clause 10.12)

METHOD OF TEST FOR DETERMINING RESISTANCE TO CRACKING OFLAMINATION UNDER HEAT

D-IGENERAL

This test determines the surface resistance to crackingwhen the specimen is subjected to a temperature of70-100°C for a definite period of time.

D-2 NUMBER OF TEST PIECES

edge. The specimens selected shall havecompact edgeswith no loose sore particles.

D-SAPPARATUS

Electric oven of suitable size having temperature rangeof 500 to 150°C.

Three specimens shall be used for each test. D-6 PROCEDURE

D-3 SPECIMEN SIZE

Specimen of size 100 mm x 100 mm x thickness ofthe board shall be used.

D-4 PREPARATION OF SAMPLE

The test specimen shall becut in the required size fromthe sample board. 150 mm away from the comer or

Keep the temperature stabilized at 70 ± 2°C. Introducethe specimens in the oven. Remove the specimens after24 h duration and observe for cracks on the laminationsurface.

Then maintain a temperature of 100 ± 2°C andintroduce the fresh specimens . Remove them after 2 hand observe for surface cracks and blemishes.

7

IS 15786 : 2008

ANNEXE

(Clause 10.13)

METHOD OF TEST FOR DETERMINING RESISTANCE TO CIGARETTE BURN

E-IGENERAL

The test is introduced to check the effect of leaving aglowing cigeratte on the lamination surface.

E-2 NUMBER OF SAMPLES

Three specimens shall be taken for test.

E-3 SPECIMEN SIZE

Specimen of size 200 nun x 100 mm x thickness of

the board could be taken.

E-4 PROCEDURE

Place a glowing cigeratte horizontally on the specimen.Keep it for 60 s and remove it from the specimen assoon as 60 s are lapsed. This could be checked by astop watch. Clean the area with water or a suitablesolvent and observe for formation of any blister orchange in colour of the surface.

F-IGENERAL

ANNEXF

(Clause 10.14)

METHOD OF TEST FOR DETERMINING RESISTANCE TO STAIN

F-6 PROCEDURE

This test determines effect of staining materials on thelamination surface.

F-2 OUTLINE OF THE METHOD

Different staining materials are applied to separate testspecimensof the decorative laminates, covered suitablyand allowed to remain in contact for a specified period.The staining agent is washed off, cleaned with adomestic abrasive cleaner and the surface examinedfor the staining produced .

F-3 APPARATUS

Glass covers, one for each staining material to preventevaporation.

NOTE - Walch glasses are su itable for this purpose.

F-4 STAINING MATERIALS

Coffee and acetic acid solution (10 percentconcentration) are the staining materials to be used onthe prelarninated cement bonded particle board.

F-5 TEST SPECIMENS

F-5.1 Specimens to be cut from the sheet to be testedshall be 75 mm long and 25 mm wide.

F-5.2The number of specimens for sheet shall be equalto twice the number of staining agents selected for test.

8

F-6.1 Resistance to Staining

Apply each staining material to two test specimens atroom temperature. Cover one of the two test specimenswith a glass cover and allow them to stand for 24 h.Wash each specimen with water containing a suitablewetting agent and then with denatured spirit (see IS324).

Allow the specimens to dry . After 1 h place thespecimens in a horizontal position under overheadwhite fluorescent light , having an intens ity of 800 toI 100 lm/m", Exclude light from other sources. Viewthe specimens at an angle of approximately 900 to thesurface and examine any discolouration on the surfaceofthe specimens where the staining agent is specificallyapplied . If any staining or discolouration is noticed,attempt to remove it by light rubbing with a milddomestic abrasive cleaner. Allow the specimens to dryand examine them again under conditions mentionedabove.

F-7 EVALUATION

The material shall be deemed to have passed the test ifno specimen shows blistering, staining ordiscolouration when finally examined. Specimen onwhich stains are removable by Iigllt rubbing with soapand water, or a mild abrasive domestic cleaner shall beconsidered acceptable.

Bureau or Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country. '

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review or Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of'BIS Catalogue' and 'Standards: Monthly Additions'.

This Indian Standard has been developed from Doc : No.,CED 20 (7477).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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