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IS 3308 (1981): Specification for Wood Wool Building Slabs [CED 20: Wood and Other Lignocellulosic Products]

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IS 3308 (1981): Specification for Wood Wool Building Slabs [CED 20: Wood and Other Lignocellulosic Products] इंटरनेट मानक 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. “जान का अधकार, जी का अधकार” “परा को छोड न 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 3308 (1981): Specification for wood wool building slabs [CED 20: Wood and other Lignocellulosic products] “ान $ एक न भारत का नमण” Satyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” “ान एक ऐसा खजाना > जो कभी चराया नह जा सकताह ै”ै Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS :3308-1981 Indian Standard SPECIFICATION FOR WOOD WOOL BUILDING SLABS (First Revision) Wood Products Sectional Committee, BDC 20 Chairman SHRI A. C. SEKHAR 26 S. B. H. Colony, Srinagar P. O., Hyderabad 500873 Members Representing AST DIRECTOR( SPECIFICATION) Ministry of Railways ( Railway Board ) RDSO, LUCKNOW SHRI J. BAIN Indian Tea Association, Calcutta SHRI P. R. CHANDRASEKHAR Directorate General of Civil Aviation, New Delhi CHIEF CONSERVATOROF FORESTS Forest Department, Government of Assam, Dispur DIRECTOR Indian Plvwood Industries Research Institute, Bangafore DR V. J. VICTOR ( Alternate ) SHRI L. N. DOKANIA Federation of Indian Plywood and Panel Industry, New Delhi SHRI M. R. MOTAYED ( Alternate ) SHRI A. K. KADERKUTTY The Western India Plywoods Ltd, Baliapatam SHRI J. S. MATHARU Directorate General of Technical Development, New Delhi SHRI P. V. MEHTA ( Alternate ) SHRI M. R. MOTAYED Plywood Manufacturers’ Association of West Bengal, Calcutta SHRI S. K. DUTTA ( Alternate ) DR A. N. NAYER In personal capacity (C-59 Inderpui, New Delhi ) DR R. S. RATRA National Buildings Organization, New Delhi SHRI A. K. RAMACHANDRA The South Indian Plywood Manufacturers’ Associa- tion, Calicut SECRETARY( Alternate ) SHRI G. V. RAO \ Ministry of Defence ( R & D ), New Delhi SHRI U. B. KANCHAN( Alternate ) REPRESENTATIVE Ministry of Defence ( DGI ), New Delhi SHRI NIRMAL SINGH ( Alternate ) ( Continued on page 2 ) 6 Cofiyright 1982 INDIAN STANDARDS INSTITUTION This publication is protected under the Indian Cojyright Act ( XIV of 1957) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act. IS : 3398 - 1981 (Continued from page 1 ) Members Representing SHRI P. R. RIJH~INGHANI Engineer-in-Chief’s Branch, Army Headquarters, New Delhi MAJ V. S. RAO f Alternate ) SHRI S. K. SANGANARIA Assam Plywood Manufacturers’ Association, Mar- gherita SHRI S. N. SANYAL Forest Research Institute & Colleges (Timber Merhanics Branch ), Dehra Dun SHRISHARAN SINGH DiregeE: General of Supplies and Disposals, New DR S. M. SINGH Central Building Research Institute ( CSIR ), Roorkee SHRI ARJUNDAS ( Alternate ) SUPERINTENDINGSURVEYOR OF Central Public Works Department, New Delhi WORKs ( NZ ) SURVEYOR WORKS ( ) ( ) H. THOMSON Sitapur Plywood Ltd, Sitapur G. W. WHITTLE,( ) G. RAMAN, General, IS1 Ex-o@cio Member Director ( Engg ) SHRI R. MEHTA Director ( Engg ), Buildings Boards 20 : 6 Convener SHRI J. S. MATHARU Directorate General of Technical Development, New Delhi Members SHRI P. V. MEHTA ( Alternate to Shri J. S. Matharu ) DEPUTY DIRECTOR STANDARDS Ministry of Railways (Railway Board ) ( CARRIAGEIII ), RDSO ASSISTANTDIRECTOR STANDARD DIREoTo~~~~ III ), RDSO ( Altern+ ) Indian Plywood Industries Research Institute, Bangalore SHRI K. DAMODARAN( Alternate ) SHRI G.R. .~OLLY Anil Hardboards Ltd, Bombay SHRI K. P. KAMALUDDIN The Western India Plywood Ltd, Baliapatam SHRI K. R. BIRJE ( Alternate ) SHRI A. K. MEHROTRA Assam Hardboards Ltd, Calcutta SHRI S. L. BAHETI ( Alternate ) SHRI S. A. NAQUI Novopan India Ltd, Pateucheru SHRI K. R. SREEDHARA( Alternate ) ( Continucd on page 11 ) IS : 3308 - 1981 Indian Standard SPECIFICATION FOR WOOD WOOL BUILDING SLABS (First Revision) 0. FOREWORD 0.1 This Indian Standard ( First Revision ) was adopted by the Indian Standards Institution on 30 October 1981, after the draft finalized by the Wood Products Sectional Committee had been approved by the Civil Engineering Division Council. 0.2 Wood wool building slabs consist essentially of wood wool chemically treated and bonded by pressing together with an inorganic cementing filler and adequately matured. Wood wool building slabs are being manu- factured in the country and such slabs are in actual use in a number of constructions. This standard lays down the essential requirements of wood wool building slabs for use in constructions and provides the necessary guidance for manufacture of wood wool building slabs in the country. 0.2.1 This standard was first published in 1969 and this is the first revision of the standard. In this revision modifications have been made in the provisions relating to sound absorption, weight stipulation, sizes permissible, etc. Since wood wool slabs of 25 mm thickness only are most commonly used for accoustical purposes, requirements for sound absorption coefficient are included for 25 mm thick slabs only; there being no data available with regard to sound absorption coefficient relevant to other thicknesses ( see 10.1). 0.3 In the formulation of this standard, due weightage has been given to international co-ordination among the standards and practices prevailing in different countries in addition to relating it to the practices in the field in this country. 0.4 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 with IS : 2-1960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. *Rules for rounding off numerical values ( revised ) . 3 IS : 3308 - 1981 1. SCOPE 1.1 This standard lays down the requirements, such as dimensions, weight and strength for wood wool building slabs. 2. TERMINOLOGY 2.0 For the purpose of this standard, the definitions given in IS : 707-1976* shall apply. 3. TYPES 3.1 The wood-wool building slabs shall be of two types designated as given below: a) Tyfie 1 Light Weight Slabs-These slabs are intended primarily for non-load bearing partitions, ceilings, wall linings, permanent shuttering and roof insulation. b) Ty@e 2 Heavy Duty Slabs-These slabs are intended for load bearing situations and for use in roof construction. These are also suitable for purposes indicated in Type 1 slabs. 4. MATERIGL 4.1 General - The slabs shall consist essentially of wood wool and an inorganic cementing material mechanically pressed together and ade- quately matured. 4.2 Timber - Almost any species of timber which satisfies the require- ment of density and quality of wood wool slabs may be used for magnesium- oxy-chloride cement bonded wood wool slabs. 4.2.1 For manufacturing Portland cement slab, Fir ( Abies spp. other than Abies densa ) shall be used. Other species with the addition of suitable additives may be used provided the requirements are met with. 5. FORM AND TEXTURE 5.1 The slabs shall be of uniform thickness with rectangular parallel faces and shall have clean reasonably square edges and shall be of uniform texture. The deviation from rectangular shape shall be not more than 5 mm measured along the edge of the slab. *Glossary of terms applicable to timber technology and utilization ( second revision ). 4 IS : 3398 - 1981 6. DIMENSIONS AND TOLERANCES 6.1 The dimensions of the slab shall be as specified in Table 1 unless other- wise agreed to between the purchaser and the manufacturer. The thickness shall be measured in accordance with the procedure given in Appendix A and shall be within the tolerance given in 6.2. TABLE 1 DIMENSIONS AND WEIGHT OF SLAB LENGTH WIDTH TYPE WEIGHT OF THE SLAB, Max mm mm kg 2 000 500 1 5 11 12’5 ::27.5 2 000 500 25.0 30.0 75 40.0 1220 610 1220 610 2 6.2 Tolerances - The permissible tolerances shall be + 6 mm in length. + 4 mm in width and &2 mm in thickness. 7. WEIGHT 7.1 The weight of each of the slabs shaIl not be greater than the values shown in Table 1 for the appropriate thickness. 8. DEFLECTION 8.1 When tested for deflection in accordance with the method given in Appendix B with loads shown in Table 2, the deflection of slabs of different thicknesses shall not exceed the values specified in Table 2. IS : 3308 - 1981 9. THERMAL CONDUCTMTY 9.1 The thermal conductivity of test specimens of the wood wool building slabs tested according to guarded hot plate method prescribed in IS : 3346- 1966* and maintaining the temperature of the hot plate and cold plate respectively at 30°C and 25°C shall be not more than 0.08 W/m.k. TABLE 2 DEFLECTION UNDER TEST LOAD ( Clauses 8.1 and B-3.1 ) TYPE SlZE THICKNESS TEST LOAD TEST SPAN DEFLECTION mmXmm mm kg cm (Mm) 1 2 000x500 25 100 45 1220x610 25 165 27.5 6 21220x610 000 x500 4050 % :: 6 75 120 100 150 :z z 6 2 2000x5001220x610 48 160120 ;z 6 75 240 75 5 10. SOUND ABSORPTION 10.1 The sound absorption coefficient as determined by the reverberation chamber method, as per IS : 8225-19767 shall be as follows: Minimum Sound Absorption Coefficient for 25 mm Thickness with Rigid Backing 125 O-1 250 0.2 500 o-2 1000 o-3 2 000 0.5 4000 0.5 10.1.1 Sound absorption coefficient for other thicknesses shall be subject to the agreement between the supplier and the purchaser.
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