BIS 2007

B U R E A U O F I N D I A N S T A N D A R D SMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

IS : 710 - 1976(Reaffirmed 2004)

Edition 2.6(2005-06)

Price Group 4

Indian StandardSPECIFICATION FOR MARINE PLYWOOD

( First Revision )(Incorporating Amendment Nos. 1, 2, 3, 4, 5 & 6)

UDC 674419.32:629.12

IS : 710 - 1976

BIS 2007

BUREAU OF INDIAN STANDARDS

This publication is protected under the Indian Copyright Act (XIV of 1957) andreproduction in whole or in part by any means except with written permission of thepublisher shall be deemed to be an infringement of copyright under the said Act.

Indian StandardSPECIFICATION FOR MARINE PLYWOOD

( First Revision )

Wood Products Sectional Committee, BDC 20

Chairman Representing

SHRI A C. SEKHAR Forest Research Institute and Colleges, (TimberMechanics Branch), Dehra Dun

Members

ASSISTANT DIRECTOR (SPECIFI-CATIONS), RDSO, LUCKNOW

Ministry of Railways

SHRI J. BAIN Indian Tea Association, CalcuttaSHRI P. R. CHANDRASEKHAR Directorate General of Civil Aviation, New DelhiSHRI L. N. DOKANIA Federation of Indian Plywood and Panel Industry,

New DelhiSHRI M. R. MOTAYED ( Alternate )

DR JOSEPH GEORGE Indian Plywood Industries Research Institute,Bangalore

DR D. C. ROY ( Alternate )SHRI M. A. ISLAM Forest Department, Government of AssamSHRI A. K. KADERKUTTY The Western India Plywood Ltd, Baliapatam (Kerala)SHRI K. S. LAULY The South Indian Plywood Manufacturers Asso-

ciation, CalicutSHRI THOMAS PAUL ( Alternate )

SHRI G. R. MAVINKURVA Forest Department, Government of KarnatakaSHRI Y. M. L. SHARMA ( Alternate )

SHRI P. V. MEHTA Directorate General of Technical Development,New Delhi

LT-COL S. A. MOHILE Ministry of Defence (R & D)SHRI B. B. MEHTA ( Alternate )

SHRI M. R. MOTAYED Plywood Manufacturers Association of West Bengal,Calcutta

SHRI S. K. DUTTA ( Alternate )DR A. N. NAYAR In personal capacity ( 117/K/18D Sarvodaya Nagar,

Kanpur ) SHRI D. E. NEALE United Planters Association of Southern India,

CochinDR R. S. RATRA National Buildings Organization, New Delhi

( Continued on page 2 )

IS : 710 - 1976

2

( Continued from page 1 )

Members Representing

SHRI P. R. RIJSINGHANI Engineer-in-Chiefs Branch, Army HeadquartersMAJ M. GOSWAMI ( Alternate )

SHRI SHARAN SINGH Directorate General of Supplies and Disposals,New Delhi

DR S. M. SINGH Central Building Research Institute (CSIR), RoorkeeSHRI ARJUN DAS ( Alternate )

SUPERINTENDING SURVEYOR OFWORKS (II)

Central Public Works Department, New Delhi

SHRI H. THOMSON Sitapur Plywood Manufacturers Ltd, SitapurSHRI G. W. M. WHITTLE ( Alternate )

SHRI D. V. VERMA Ministry of Defence (DGI)SHRI NIRMAL SINGH ( Alternate )

SHRI D. AJITHA SIMHA, Director General, BIS ( Ex-officio Member )Director (Civ Engg)

SecretarySHRI J. R. MEHTA

Deputy Director (Civ Engg), BIS

Plywood Subcommittee, BDC 20 : 1Convener

SHRI A. K. KADERKUTTY The Western India Plywood Ltd, Baliapatam (Kerala)

Members

SHRI B. ANANDASWAMY Central Food Technological Research Institute(CSIR), Mysore

SHRI J. BAIN Indian Tea Association, CalcuttaSHRI BALIA BISWAS Calcutta Tea-Chest Fittings Manufacturers

Association, CalcuttaSHRI B. K. KHAITAN ( Alternate )

SHRI P. R. CHANDRASEKHAR Directorate General of Civil Aviation, New DelhiSHRI P. G. DESHMUKH Indian Institute of Packaging, Bombay

SHRI C. S. PURUSHOTHAMAN ( Alternate )SHRI M. K. DUTT Tea Board, Calcutta

DR K. K. MITRA ( Alternate )DR JOSEPH GEORGE Indian Plywood Industries Research Institute,

BangaloreSHRI V. SIVANANDA ( Alternate )

SHRI C. P. GOENKA Indian Tea-Chest Battens Manufacturers Asso-ciation, Yamunanagar

SHRI J. N. KAPUR ( Alternate )DR R. C. GUPTA Forest Research Institute and Colleges (Wood

Composite Branch), Dehra DunSHRI P. V. MEHTA Directorate General of Technical Development,

New Delhi( Continued on page 14 )

IS : 710 - 1976

3

Indian StandardSPECIFICATION FOR MARINE PLYWOOD

( First Revision )0. F O R E W O R D

0.1 This Indian Standard (First Revision) was adopted by the IndianStandards Institution on 8 June 1976, after the draft finalized by theWood Products Sectional Committee had been approved by the CivilEngineering Division Council.0.2 The plywood used in the construction, repair and maintenance ofmarine and river craft is required to withstand rigorous conditionsinvolving changes in temperature, humidity and alternate wetting anddrying. In addition, they also need to withstand attack by marineorganisms. As such, the commercial plywood used for general purposeswas found to be unsuitable and the Wood Products SectionalCommittee, at the instance of the Ministry of Defence, has preparedthis specification for marine plywood.0.3 The method of manufacture of marine plywood, especially theadhesives used in the manufacture, have been specifically stated sothat the resulting plywood is capable of withstanding the rigorousconditions which marine plywood may have to withstand.0.4 This standard was first published in 1957. The present revision isbased on the experience gained in the manufacture and use of themarine plywood over these years. In this revision, details of methods oftests have been omitted and cross references given to the relevantmethods of tests in IS : 1734 (Parts I to XX)-1972*.0.5 This standard contains clause 4.2.3.4 which calls for agreementbetween the purchaser and the manufacturer.0.6 In the formulation of this standard due weightage has been givento international co-ordination among the standards and practicesprevailing in different countries in addition to relating it to thepractices in the field in this country.0.7 This edition 2.6 incorporates Amendment No. 2 (July 1980),Amendment No. 3 (January 1987), Amendment No. 4 (February 2001)Amendment No. 5 (February 2005) and Amendment No. 6 (June 2005).Side bar indicates modification of the text as the result of incorporationof the amendments. Amendment No. 1 had been incorporated earlier.0.8 For the purpose of deciding whether a particular requirement of

*Methods of tests for plywood (Parts I to XX) ( first revision ).

IS : 710 - 1976

4

this standard is complied with, the final value, observed or calculated,expressing the result of a test or analysis, shall be rounded off inaccordance with IS : 2-1960*. The number of significant placesretained in the rounded off value should be the same as that of thespecified value in this standard.

1. SCOPE1.1 This standard covers requirements for materials, manufacture andperformance of marine plywood suitable for the construction, repairand maintenance of marine and river craft, pontoons and the like.

2. TERMINOLOGY2.1 For the purpose of this standard, the definitions given inIS : 707-I976 shall apply.

3. MATERIALS3.1 Timber The species of timbers to be used for the manufactureof face veneers, cores and cross bands of marine plywood shall be asgiven in Tables 1 and 2.

*Rules for rounding off numerical values ( revised ).Glossary of terms applicable to timber technology and utilization ( second revision ).

TABLE 1 SPECIES OF TIMBERS FOR FACE VENEERS

( Clause 3.1 )

TRADE NAME BOTANICAL NAME ABBREVIATIONFOR MARKING

(1) (2) (3)

Birch Batula sp. BIRBonsum Phoebe sp. BONChaplash Artocarpus chaplasha CHPGurjan Dipterocarpus sp. GURHollock Terminalia myriocarpa HOLHollong Dipterocarpus macrocarpus HONMahagony Swietenia sp. MAOMaple Acer sp. MAPMakai Shorea sp. MAKMundani Acrocarpus fraxinifolius

wightMUN

Padauk Pterocarpus dalbergioides PAAPoon Calophyllum sp. POORosewood Dalbergia latifolia ROSSandan Ougeinia oojeinensis

( syn. O. dalbergioides )SAD

Sissoo Dalbergia sissoo SISTeak Tectona grandis TEAWalnut Juglans sp. WALWhite ceder Dysoxylum malabaricum WCE

IS : 710 - 1976

5

TABLE 2 SPECIES OF TIMBERS SUITABLE FORCORE AND CROSS-BANDS

( Clause 3.1 )

TRADE NAME BOTANICAL NAME ABBREVIATIONFOR MARKING

(1) (2) (3)

Aini Artocarpus hirsutus AIN

Birch Betula sp. BIR

Bonsum Phoebe sp. BON

Champ Michelia sp. CHM

Chaplash Artocarpus chaplasha CHP

Chickrassy Chukrasia velutina( Syn. C. tabularis )

CHI

Gurjan Dipterocarpus sp. ( other than D. macrocarpus )

GUR

Hollock Terminalia myriocarpa HOL

Hollong Dipterocarpus macrocarpus HON

Kathal Artocarpus heterophyllus ( Syn. A. integrifolius )

KAT

Mahagony Swietenia sp. MAO

Maple Acer sp. MAP

Mango Mangifera indica MAN

Makai Shorea sp. MAK

Mullilam Zanthoxylum rhetsa( Syn. Fagara budrunga )

MUI

Mundani Acrocarpus fraxinifolius wight

MUN

Nedunar Polyalthia sp. NED

Pali Palacquium elliptioum PAL

Poon Calophyllum sp. POO

Rosewood Dalbergia latifolia ROS

Sandan Ougeinia oojeinensis( Syn. O. dalbergioides )

SAD

Sissoo Dalbergia sissoo SIS

Teak Tectona grandis TEA

Vellapine Vateria indica VEL

Walnut Juglans sp. WAL

White ceder Dysoxylum malabaricum WCE

IS : 710 - 1976

6

3.1.1 No alternative species of timber shall be used without the priorapproval of the purchaser.

3.1.2 In selecting the species for the manufacture of plywood, it isrecommended that as far as possible a single species of timber shall beused and where combinations of different species are used, care shallbe taken to prevent incompatibility of the two species.

3.2 Adhesive The adhesive used for bonding the veneers shall be ofthe hot-press synthetic resin, phenol formaldehyde type (BWP) andshall conform to IS : 848-1974*. Extender shall not be added to theadhesive by the plywood manufacturer. Fillers, if used, shall notexceed 10 percent by mass of solid content of the glue.

4. MANUFACTURE

4.1 Veneers The veneers shall be either rotary cut or sliced. Theveneers shall be reasonably smooth to permit an even spread of glue.The veneers shall be conditioned to a moisture content not exceeding10 percent before bonding.

4.1.1 Defects in Veneers The veneers to be used for the faces shall befree from sapwood. Core veneers may contain sound knots whosemaximum dimensions in any one direction do not exceed 5 cm, opendefects (split and check), provided such defects do not impair thesmooth finish of the surface required for paintink or staining. Deadknots shall not be permissible. Overlaps or pleats shall not be allowed.

4.2 Assembly

4.2.1 Glueing The glue shall be evenly spread and the veneers shallbe securely cemented together without overlap. No unglued areas orstarved joints shall be found on separation of veneers.

4.2.2 Thickness of Veneers The thickness of veneers shall beuniform within a tolerance of 5 percent, Corresponding veneers oneither side of the central plane of the board shall be of the samethickness and species, and shall be cut by the same method, that is,either all rotary cut or all sliced.

4.2.2.1 In the case of 3-ply boards, the thickness of the centre veneer(core) shall be at least equal to that of one of the face veneers, but shallnot exceed the combined thickness of the two face veneers. In the caseof multi-ply boards the thickness of any veneer shall not exceed twicethe thickness of any other veneer in the same board.

*Specification for synthetic resin adhesive for plywood (phenolic and aminoplastics)( first revision ).

IS : 710 - 1976

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4.2.3 Joint in Veneers

4.2.3.1 Veneers, which require to be jointed to form a ply, shall bespliced before assembly. All joints shall be cut square.

Tapes, other than fusible tapes, shall not be used internally andwhen used for making edge joints or repairing splits in face veneersthey shall be removed subsequently.

Fusible tapes shall be such that they are converted in the process ofmanufacture, to an adhesive that complies with the test requirementsapplicable to the adhesive used for the manufacture of the plywood.

4.2.3.2 Edge joints Edge joints in veneers shall be made on a tape-less splicer or by fusible tape and staggered not less than 2.5 cm asbetween any veneer and the next one with the same grain direction onboth the faces.

4.2.3.3 End joints End joints shall be permitted in all veneers form-ing the core ply and in the veneers of face plies of panels provided thelength of such panels is over 2 m. All such joints shall be accuratelyscarfed with an inclination not steeper than 1 in 10 and bonded withan adhesive complying with the requirements specified under 3.2.

4.2.3.4 Scarf joints When sizes larger than available press size arerequired, boards to the required size shall be made with proper scarfjoints through the thickness of the board, with the prior approval ofthe purchaser. The number and location of scarf joints shall be asagreed to between the purchaser and the manufacturer.

All scarf joints shall be bonded with the same adhesive used for themanufacture of the plywood and shall be made with an inclination notsteeper than 1 in 10. The species of timber in corresponding plies ofadjacent board scarfed together shall be the same.

4.2.4 Grain Direction Unless otherwise specified by the purchaserand except in boards comprising an even number of plies, the directionof grain of the veneer in adjacent plies shall be at right angles to eachother and that of the outer plies shall run parallel to the length of thesheet. In boards comprising an even number of plies the grain of thecentre pair shall follow the same direction. In adjacent plies in whichthe grains are required to be at right angles to each other, a deviationnot exceeding 10 may be permitted. In all cases the grain on bothfaces of the assembled boards shall run in the same direction.

The grain of the veneer shall normally be parallel to the edges ofrectangular boards, but other grain direction, for example diagonal,may be agreed to between the purchaser and the supplier.

IS : 710 - 1976

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4.3 Treatment4.3.1 The board shall be given treatment by pressure impregnationwith fixed type either water soluble or oil-based preservatives andhaving retention of a minimum of 12 kg/m3 in case of CCA (copperchrome arsenic) or CCB (copper chrome boron) or ACC (acid copperchrome) compositions or 100 kg/m3 in case of creosote or creosote-fueloil composition as specified in Annex A of IS : 5539-1969*, withadequate penetration.4.4 Moisture Content Finished plywood boards shall have amoisture content of not less than 5 percent and not more than15 percent at any time of the year depending on the part of the countrywhere the test is carried out ( see IS : 287-1973 ).

5. DIMENSIONS5.1 The dimensions of plywood boards shall be as follows:

5.2 ThicknessThe thickness shall be 3 mm, 4 mm, 5 mm, 6 mm, 9 mm, 12 mm, 15 mm,19 mm, 22 mm and 25 mm.

NOTE Any other dimensions (length, width and thickness) as agreed to betweenthe manufacturer and the purchaser may be used.

6 TOLERANCES

Tolerance on the nominal sizes of finished boards shall be as given below:

*Specification for preservative treated plywood.Recommendations for maximum permissible moisture content of timber used for

different purposes ( second revision ).

2 400 mm 1 200 mm 2 100 mm 900 mm2 100 mm 1 200 mm 1 800 mm 900 mm1 800 mm 1 200 mm

Dimension ToleranceLength + 6 mm 0Width + 3 mm 0Thickness:i) Less than 6 mm 10 percentii) 6 mm and above 5 percentEdge straightness 2 mm per 1 000 mm or 0.2 percentSquareness 2 mm per 1 000 mm or 0.2 percent

NOTE Edge straightness and squareness shall be tested as per Annex A.

IS : 710 - 1976

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7. WORKMANSHIP AND FINISH

7.1 The face and back of the finished panels shall be free from checks,splits, gaps (subject to provisions given in 7.4), blisters, harmful dis-colouration, any kind of decay, pleats and overlaps, insect holes, deador loose knots and live knots whose maximum dimensions in anydirection exceed 25 mm. The plywood shall be free from wrap.7.2 Sound knots of diameter 25 mm and less shall be permittedprovided the centre to centre distance between any two such knots isnot less than 30 cm.7.3 The face shall be free from any patches, but on the back, patches atdistances of not less than 60 cm apart shall be permissible. Themaximum dimension of any one patch shall be not more than 4 cm.7.4 Splits, gaps and open joints shall not be permitted in core. Thesemay be permitted in face provided the gap or opening does not exceed awidth of 0.5 mm. If exceeding 0.5 mm this may be rectified by wellfitted veneer inserts of a minimum width of 5.0 mm provided the grainof the veneer does not exceed in deviation by more than 10 percentfrom the grain direction of the surrounding veneer.7.5 The finish shall be reasonably smooth and sanding shall be givento both the sides if so required by the purchaser.7.6 The minimum width of the veneers used in face and back of theboards shall be not less than 7.5 cm except at the edges where it maybe less. The edge of the board shall be trimmed square.

8 TESTS

8.1 Test pieces cut from each of the board selected as specified under 10shall be subjected to tests stipulated under 8.1.1 to 8.1.5.8.1.1 Moisture Content The moisture content of test pieces cut fromeach board selected as under 8.1 shall not exceed 15 percent nor be lessthan 5 percent when determined by the method described in IS : 1734(Part I)-1972*.8.1.2 Glue Adhesion in Dry State8.1.2.1 Glue shear strength When tested for glue adhesion by themethod described in IS : 1734 (Part IV)-1972 the average failing loadshall be not less than 1 350 N (135 kg) and no individual value shall beless than 1 100 N (110 kg).

*Methods of tests for plywood: Part I Determination of density and moisture content( first revision ).

Methods of tests for plywood: Part IV Determination of glue shear strength ( firstrevision ).

IS : 710 - 1976

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8.1.2.2 Adhesion of plies The adhesion of plies shall be tested byforcibly separating the layers. The veneers shall offer appreciableresistance to separation and the fractured samples shall show someadherent fibres distributed more or less uniformly. Adhesion may alsobe tested by knife test method described in IS : 1734 (Part V)-1972*.

NOTE In case, a definite result is not obtainable by the method described inIS : 1734 (Part IV)-1972, the result of knife test described in IS : 1734(Part V)-1972* shall be considered as decisive. In case of even number of plies wherethe grains of central plies follow the same direction the result as obtained from knifetest shall be considered final.

8.1.3 Water Resistance Test Six test pieces each approximately 25 10 cm, shall be cut from any position in the board such that the grainof the face veneer is parallel to the length of the piece. Thesespecimens shall be kept submerged in a pan of boiling water for aperiod of 72 hours. The period of 72 hours for boiling may be acontinuous period or an aggregate of smaller periods of boiling if thetest piece is left in cold water between these smaller periods. Thesetest pieces shall then be removed from the boiling water and cooleddown to room temperature by plunging them in cold water. These testspecimens, while still in wet condition, shall be subjected to testsdescribed under 8.1.3.1 and 8.1.3.2.

8.1.3.1 Glue shear strength When tested for glue shear strength bythe method described in IS : 1734 (Part IV)-1972 the average failingload shall be not less than 1 000 N (100 kg) and no individual valueshall be less than 800 N (80 kg).

8.1.3.2 Adhesion of plies The adhesion of plies shall be tested byforcibly separating the layers. The veneers shall offer appreciableresistance to separation and the fractured sample shall show someadherent fibres distributed more or less uniformly. Adhesion may alsobe tested by knife test method described in IS : 1734 (Part V)-1972*.

NOTE In case, a definite result is not obtainable by the method described inIS : 1734 (Part IV)-1972, the result of knife test described in IS : 1734 (PartV)-1972* shall be considered as decisive. In case of even number of plies where thegrains of central plies follow the same direction the result as obtained from knife testshall be considered final.

8.1.4 Tensile Strength The tensile strength when determined by themethod described in IS : 1734 (Part IX)-1972 shall comply with the

*Methods of tests for plywood: Part V Test for adhesion of plies ( first revision ).Methods of tests for plywood: Part IV Determination of glue shear strength

( first revision ).Methods of tests for plywood: Part IX Determination of tensile strength ( first

revision ).

IS : 710 - 1976

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following values. If the plywood contains scarf joints, half the specimensubjected to testing shall contain the joint.

8.1.5 Mycological Test The test for resistance to micro-organismshall be carried out, when required, by the method described inIS : 1734 (Part VII)-1972*. The test piece shall:

a) show no appreciable signs of separation at the edges of theveneers, and

b) comply with the requirements specified in 8.1.3.

8.1.6 Static Bending Strength Three test specimens taken in eachdirection from the sample of plywood, when tested in accordance withIS : 1734 (Part 11)-1983 shall have an average and a minimumindividual Modulus of Elasticity and Modulus of Rupture not less thanthe values specified in Table 3.

8.1.7 Retention of Preservative

When plywood is tested as per IS : 2753 (Part 1)-1991 and

a) It shall be not less than 42.0 N/mm2 (420 kgf/cm2) in the directionparallel to grain direction of the face veneers.

b) It shall be not less than 25 0 N/mm2 (250 kgf/cm2) in the directionof right angles to the grain direction of the face veneers.

c) The sum of the tensile strength in both directions shall be notless than 84.5 N/mm2.

*Methods of tests for plywood: Part VII Mycological test ( first revision )

TABLE 3 MODULUS OF ELASTICITY (MOE) AND MODULUS OFRUPTURE (MOR)

( Clause 8.1.6 )

DIRECTION MOE (N/mm2) MOR (N/mm2)

Average Min. Ind. Average Min. Ind.

(1) (2) (3) (4) (5)

Along (Directionparallel to the grain direction of the face veneer)

7 500 6 700 50 45

Across (Direction perpendicular to the grain direction of the face veneer)

4 000 3 600 30 27

Methods for estimation of preservatives in treated timber and in treating solutions:Part 1 Determnation of copper, arsenic, zinc, boron, creosote and fuel oil ( first revision ).

IS : 710 - 1976

12

IS : 2753 (Part 2)-1991*, it shall have a retention of preservative asspecified in 4.3.1.

9. MARKING

9.1 Each plywood board shall be legibly and indelibly marked orstamped with the following particulars along with such other marks asthe purchaser may stipulate at the time of placing order:

9.1.1 The plywood board may also be marked with the Standard Mark.

NOTE The use of the Standard Mark is governed by the provisions of the Bureau ofIndian Standards Act, 1986 and the Rules and Regulations made thereunder. TheStandard Mark on products covered by an Indian Standard conveys the assurancethat they have been produced to comply with the requirements of that standardunder a well defined system of inspection, testing and quality control which isdevised and supervised by BIS and operated by the producer. Standard markedproducts are also continuously checked by BIS for conformity to that standard as afurther safeguard. Details of conditions under which a licence for the use of theStandard Mark may be granted to manufacturers or producers may be obtained fromthe Bureau of Indian Standards.

10. SAMPLING

10.1 The method of drawing representative samples and the criteria ofconformity shall be as prescribed in IS : 7638-1975.

11. TENDER SAMPLE, INSPECTION AND ACCEPTANCE

11.1 Where samples are required to be tendered, three samples, eachnot less than 90 60 mm in size shall be submitted by the supplier,and these samples, if the tender is accepted, shall constitute thestandard as regards the type of timber, quality and finish.

*Methods for estimation of preservatives in treated timber and in treatingsolutions : Part 2 Determination of copper (in copper organic preservative salt) andpentachlorophenol ( first revision ).

a) Manufacturers name, initials or recognized trade-mark, if any;

b) Year of manufacture;

c) Abbreviations indicating the species of timber used in each ply,as indicated in col 3 of Tables 1 and 2; and

d) Batch number.

Methods of sampling of plywood.

IS : 710 - 1976

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ANNEX A( Clause 6 )

METHOD OF TEST FOR EDGE STRAIGHTNESS AND SQUARENESS

A-1 PROCEDURE FOR EDGE STRAIGHTNESS

A-1.1 The straightness of the edges and ends of plywood shall beverified against a straight edge not less than the full length of theplywood. If the edge on the end of the plywood is convex, it shall beheld against the straight edge in such a way as to give approximatelyequal gap at each end. The largest gap between the straight edge andthe edge shall be measured to the nearest millimetre and recorded.

A-2 PROCEDURE FOR SQUARENESS

A-2.1 The squareness of plywood shall be checked with a 1 200 mm 1 200 mm square, by applying one arm of the square to the plywood.The maximum width of the gap shall be recorded.

IS : 710 - 1976

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( Continued from page 2 )

Members Representing

LT-COL S. A. MOHILE Ministry of Defence (R & D)SHRI B. B. MEHTA ( Alternate )

SHRI S. K. SANGANARIA Assam Plywood Manufacturers Association, TinsukiaSHRI N. P. NAIR ( Alternate )

SHRI A. C. SEKHAR Forest Research Institute and Colleges (TimberMechanics Branch), Dehra Dun

SHRI R. K. TALUKDAR Plywood Manufacturers Association of West Bengal,Calcutta

SHRI S. K. DUTTA ( Alternate )SHRI H. THOMSON Sitapur Plywood Manufacturers Ltd, Sitapur

SHRI PURSHOTAM DAYAL ( Alternate )SHRI N. VENKATARAMAN The South Indian Plywood Manufacturers Asso-

ciation, CalicutSHRI THOMAS PAUL ( Alternate )

Bureau of Indian StandardsBIS 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 ofgoods and attending to connected matters in the country.

CopyrightBIS has the copyright of all its publications. No part of these publications may be reproduced in anyform without the prior permission in writing of BIS. This does not preclude the free use, in the courseof implementing the standard, of necessary details, such as symbols and sizes, type or gradedesignations. Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian StandardsAmendments are issued to standards as the need arises on the basis of comments. Standards are alsoreviewed periodically; a standard along with amendments is reaffirmed when such review indicatesthat no changes are needed; if the review indicates that changes are needed, it is taken up forrevision. Users of Indian Standards should ascertain that they are in possession of the latestamendments or edition by referring to the latest issue of BIS Catalogue and Standards : MonthlyAdditions.This Indian Standard has been developed by Technical Committee : BDC 20 and amended by CED 20

Amendments Issued Since Publication

Amend No. Date of IssueAmd. No. 1 Incorporated earlierAmd. No. 2 July 1980Amd. No. 3 January 1987Amd. No. 4 February 2001Amd. No. 5 February 2005Amd. No. 6 June 2005

BUREAU OF INDIAN STANDARDSHeadquarters:

Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002.Telephones: 323 01 31, 323 33 75, 323 94 02

Telegrams: Manaksanstha(Common to all offices)

Regional Offices: Telephone

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Title Page0. Foreword1. Scope2. Terminology3. MaterialsTable 1Table 2

4. Manufacture5. Dimensions6. Tolerances7. Workmanship and Finish8. TestsTable 3

9. Marking10. Sampling11. Tender Sample, Inspection and AcceptanceAnnex A