( Reaffirmed 2006 ) IS:4834-1968 Indian Standard SPECIFICATION FOR VENEERED-WOOD BOARDS FOR PACKING CASES Wood Products Sectional Committee, BDC 20 Chairman SHRI D. NARAYANAMURTI Refiresen ting Indian Plywood Bangalore Industries Research Association, Members ASSISTANTDIRIZTOR ( SPECIPICA- Railway Board ( Ministry of Railways ) SKRI P. BARUA DIRECTOR, SCIENTIFIC RESEARCH SHRI L. N. DOKANIA SHRI G. L. KEDIA (Alternate 1 DR JOSEPHGEORQE TION ) Forest Department, Government of Assam Naval Headquarters The Plywood Manufacturers' Association Calcutta Cent~Jorleilding Research Institute of India, ( CSIR ), Ltd, Baliapatam Forest Department, Government of Mysore SHRI N. S. KAIKIN: SHRI D. NANJUNDAPPA ( Alternate) Forest Research Institute & Colleges, Dehra Dun SHRI R. C. KAUSHIK Jay Shree Tea & Industries Ltd, Calcutta SHRI G. I,. KEDIA SHRI N. P. MOHTA (Alternate ) Indian Tea Association, Calcutta SHRX K. M. KIDWAI SHRI J. BAIN (Alternate) South India Plywood Manufacturers' Associatioil, SHRI K. S. LAULY Calicut SHRI V. J. NEDUNGADI ( Alternate ) Directorate General of Technical Development SHRI J. S. MATHARU Ministry of Defence ( R & D ) DR A. N. NAYER SHRI R. N. VAIDYA ( Alternate ) Forest Research Institute & Colleges, Dehra Dun PRESIDENT National Buildings Organization SHRI RABINDERSINGH SHRI R. K. BHARTARI (Alternate) Directorate General of Civil Aviation SHRI S. RAMAMRITHAM Engineer-in-Chief's Branch, Army Headquarters SHRI P. R. RIJHSINGHANI Fore;radD;partment, Government of Madhya SHRI N. K. SHARhiA SUPERINTENDING SURVEYOR OF Central Public Works Department WORKS Paharpur Timber Pvt Ltd, Calcutta SHRI M. SWARUP Plywood Products, Sitapur &RI H. `lh0M~0N SHRI G. W. M. WHITTLE (Alternate) ( Continued on pug8 2 ) SHRI SHIVA MOHAN SINGH ( Alternate) The Western India Plywood SHRI A. K. KADERKUTTY , INDIAN MANAK STANDARDS BHAVAN, 9 BAHADUR NEW DELHI INSTITUTION SHAH 1 ZAFAR MARG IS:483401968 ( Continued from page 1 ) Members L. VERMA SHRI R. NAGARAJAN, Director ( Civ Engg ) SHRI B. Representing Assam Railways and Trading Co Ltd, Margherita Director General, IS1 ( Ex-oficio Member) Secfetary SHRI J. VENKATARAMAN Assistant Director ( Civ Engg ), ISI Special Convener DR A. N. NAYER Members Wood Products Subcommittee, BDC 20 : 8 Ministry of Defence ( R & D ) R. N. VAIDYA (Alternate to Dr A. N. Nayer ) Forest Research Institute & Colleges, Dehra Dun SHRI N. C. JAIN Central India Board Products, Itarsr Sriru K. S. LAULY The Western India Plywood Ltd, Baliapatam SIIRI A. K. RAMACHANDRA SHRI IS : 4834- 1968 Indian Standard SPECIFICATION FOR VENEERED-WOOD BOARDS FOR PACKING CASES 0. FOREWORD 0.1 This Indian Standard was adopted by the Indian Standards Institution on 17 November 1968, after the draft finalized by the Wood Products Sectional Committee had been approved by the Civil Engineering Division Council. 0.2 Wooden packing cases and boxes are being used in the country in large quantities for packing a wide variety of commodities and articles. Since there is a general shortage of timbers suitable for packing cases in the country, the cost of such containers is going up and the supply prospects are becoming difficult day by day. 0.2.1 In view of 0.2, veneered-wood boards are now being used in increasing quantities for the manufacture of packing cases and boxes. This standard lays down the method of manufacture, the requirements and tests for such boards with a view to helping in the production of such boards. This material is different from blockboards for commercial and decorative purposes, covered by IS : 1659-1960*. 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 : 2-19601. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. 1. SCOPE 1.1 This standard covers the requirements of veneered-wood intended for packing cases and boxes and similar work. *Specification for blockboards. .tRules for rounding off numerical values ( revised). boards 3 IS:4834- 1968 2. TERMINOLOGY 2.0 For the purpose of this standard, given in IS : 707-1968* shall apply. the following definition and those 2.1 Veneered-Wood Boards - A board having a core made up of solid wood planks, each not less than 80 mm in width, glued or otherwise jointed to form a slab which is glued between two outer veneers with the direction of the grain of the core running at right angles to that of the outer veneers. 3. GRADES 3.1 Veneered-wood boards shall be of the following two grades: a) Grade 1 for the manufacture of packing cases or boxes to be used as ` storage packs `. b) Grade 2 for the manufacture of packing cases or boxes to be used as c transit packs `. 4. MATERIALS 4.1 Timber 4.1.1 Core-Timber IS : 303-19601_. for cores shall conform to class II or class III of 4.1.2 Face Veneers -Timbers II of IS: 303~19607. for face veneers shall be of class I or class 4.2 Adhesives-The adhesives used for bonding purposes shall be the WWR and unextended CWR types conforming to IS: 848-1957: for Grade 1 and Grade 2 boards respectively. 5. MANUFACTURE 3.1 Construction - The veneered-wood boards for packing cases shall be of three-ply' construction. 5.2 Core -The core strips shall be cut out from the timbers specified in 4.1.1 and seasoned to a moisture content not exceeding 12 percent. The width of each strip shall not be less than 80 mm, and its length not In any one board the core strips shall less than the length of the board. be of one species of timber only. *Glossary of terms applicable for plywood for synthetic to timber and timber products ( revised ). ( phenolic and aminoplastic ). resin adhesives for plywood ( revtied). $$ecification $Specification for general purposes 4 IS:483411968 5.3 Faces -Veneers used for faces shall be sawn/sliced/rotary cut and shall be reasonably smooth. 5.4 Veneered-wood veneers. boards shall be made by gluing core strips between 5.5 Unless otherwise specified, the nominal thicknesses of the veneeredwood boards, core stock and veneers for faces shall be as follows: Veneered- Wood Board, mm Core Stock mm 6 9 10 13 Veneers for Faces, mm 9 13 16 19 1.5 2.0 3.0 3.0 5.6 Permissible defects and tolerances on thickness for veneers shall conform to IS : 303-1960*. 6. WORKMANSHIP 6.1 The boards specified in 7.3. AND FINISH thickness within the tolerances The edges shall be of uniform 6.2 All boards shall be flat and their faces reasonably of the boards shall be trimmed square within 3 mm. 7. DIMENSIONS AND TOLERANCES smooth. 7.1 The dimensions of the veneered-wood boards shall be quoted in the following order: The first dimension shall represent the length, that is the dimension parallel to the grain of faces; the second, the width; and the third, the thickness. 7.2 Dimensions - Unless otherwise specified, the veneered-wood shall conform to the following dimensions: Length Width Thickness boards cm 120,90, 60 7.3 Tolerances Dimension cm 60,30 9, 1$:, Tolerance 19 The tolerances on dimensions shall be as follows: f6 mm f3mm f0.5 mm Length Width Thickness *Specificationfor plywoodfor general purposw( revised ) . 5 IS : 4834 - 1968 8. SAMPLING all the veneered-wood boards of the same grade and dimensions and manufactured under similar conditions of production shall be grouped together to constitute a lot. 8.2 The number of veneered-wood boards to be selected from a lot shall be as follows: Lot Size .N &umber of Veneered- Wood Boards to be Selected n 50 2 3 4 5 7 8.1 In any consignment, up to 51 ,, 100 101 ,, 200 201 301 ,, 300 ,, 500 501 and above 10 8.2.1 The veneered-wood boards shall be selected at random. In order to ensure randomness of selection, all the veneered-wood boards in the lot may be arranged in a serial order and every rth board may be selected till the required number is obtained, r being the integral part of fl/n where .N is the lot size and n is the sample size. 9. TESTS of Test Specimens - From each of the veneered-wood boards sele'cted, the following test specimens shall be cut out from the portion 15 cm away from the edges and avoiding any joints in the core slab. A tolerance of +I*5 mm shall be permissible on the length and width of the test specimens. Each test specimen shall be rectangular with all edges cut square to the surface: a) One test specimen of size 20 x 10 cm for the test specified in 9.3, b) Two test specimens of size 20 x 10 cm for the test specified in 9.5, and 9.1 Preparation c) Two test specimens of size 15 x 2.5 cm for the test specified in 9.5. 9.2 Conditioning of Test Specimens - With regard to tests covered in 9.3 and 9.4, the prepared test specimens shall be suitably conditioned and the procedure adopted shall be reported. NOTE- Exposurefor 24 hours to the air of a well-ventilated room will often suffice, but if a greater degree of accuracy is requiredthe test specimenshall be exposed to an atmosphere maintained at a temperature of 27" f 2°C and a relative humidity of 65 f 5 percent until they are substantially constant in weight. G IS:4834-1968 9.2.1 Test specimens cut from each of the boards selected in accordance with 8.2 shall satisfy the tests laid down in 9.3 to 9.6. 9.3 Variation in Thickness -When tested in accordance with Appendix A, the variation in thickness shall be within the tolerance limits prescribed in 7.3. 9.4 Adhesion of Plies -The adhesion of plies shall be tested by forcibly separating the surface layers from the underlayment by the use of a prising knife. The veneers shall offer appreciable resistance to separation and the fractured surfaces shall show some adherent fibres distributed more or less uniformly. 9.5 Resistance to Water-W hen tested in accordance with Appendix B, the test specimens shall satisfy the requirements of 9.4. 9.6 Mycological Test - When tested in accordance with Appendix C, the test specimens shall show no appreciable signs of separation at the . edges. 9.7 Re-test - If the samples selected as specified in 8.2 are found not to be fully complying with the requirements of 9.3 to 9.6 a further similar set of samples shall be taken at random from the same lot and subjected to the tests. If any of the samples in the second lot is also found not to comply fully with the requirements of tests, all the boards in the lot represented by the samples shall be rejected. 10. PRESERVATIVE TREATMENT 10.1 After inspection, the accepted supplies shall be treated by momentary dipping ( dip-indip-out treatment ) in a suitable preservative solution, as agreed to between the purchaser and the supplier. 11. DELIVERY 11.1 The veneered-wood boards shall be supplied in a clean and dry condition and shall be suitably packed according to the approved trade practice, unless otherwise specified by the purchaser. 12. MARRING 12.1 Each veneered-wood board shall be legibly and indelibly stamped with the following information: a) Manufacturer's name or initials or trade-mark, b) Grade, and c) Year of manufacture. 7 marked or x+:4834-1968 12.2 All markings shall be done on the face of the board near one edge. 12.2.1 Each board may also be marked with the IS1 Certification Mark. NOTE - The use of the IS1 Certification Mark is governed by the provisions of the Indian Standards Institution ( Certification Marks ) Act, and the Rules and Regulations made thereunder. Presence of this mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard, under a well-defined system of inspection, testing and quality control during production. This system, which is devised and supervised by IS1 and operated by the producer, has the further safeguard that the products as actually marketed are Details of conditions, under continuously checked by IS1 for conformity to the standard. which a licence for the use of the IS1 Certification Mark may be granted to manufacturers or processors, may be obtained from the Indian Standards Institution. APPENDIX ( Clause 9.3 TEST A-l. A-l.1 PROCEDURE FOR VARIiTION A ) IN THICKNESS Each test specimen shall be tested for thickness. A-1.1.1 The thickness shall be measured in millimetres to an accuracy of f0.02 mm. The contracting surfaces of the measuring instrument shall be flat and shall have a diameter approximately 6 mm. Eight readings shall be taken approximately 20 mm inside the edges of the test specimens, namely, at the four corners, and at the mid-points of the edges. A-2. RRPGRTING OF TEST RESULTS A-2.1 The mean thickness of each of the test specimens shall be reported together with the mean of the eight readings. NOTE- It is essential that the thickness is measured at a sufficient number of points distributed over the whole area of the board to ensure that a reasonably true average value is obtained. APPENDIX ( Clause 9.5 TEST B-l. PROCEDURE FOR RESISTANCE B ) Td WATER B-l.1 Grade 1 Boards - The test specimens shall be submerged in a pan of cold water, care being taken that the pieces do not touch the bottom 8 IS : 4834 - 1968 of the pan. The water shall be heated to 70" & 2°C and maintained at this temperature for 3 hours. After this, the test specimens shall be removed from the hot water and plunged immediately into cold water. While still water-soaked, the test specimens shall be tested by forcibly separating the outer layers, using a prising knife. B-l.2 Grade 2 Boards - The test specimens shall be submerged in a pan of cold water, care being taken that the pieces do not touch the bottom of the pan. After 24 hours, the test specimens shall be removed from the water and while still water-soaked, shall be tested by forcibly separating the outer layers, using a prising knife. APPENDIX ( Clause 9.6 MYCOLOGICAL C-l. PROCEDURE ) C TEST C-l.1 A flat rectangular dish of enamelled iron, glass or porcelain ( such as a photographic developing dish ) shall be filled to a depth of about 25 mm with saw-dust of non-durable timber, like Semul ( salmalia malabarica ), previously moistened with a sufficient amount of an aqueous solution containing 12 g of cane sugar per Iitre of water. The quantity of sugar solution added should be just enough to moisten the saw-dust completely, and should not be so much as may be squeezed out by hand pressure. C-l.2 The saw dust shall then be charged with the spores of the commonly occurring Indian fungii and loosely compacted, and the test pieces then pressed down into it so that their upper surfaces are level with the top of the saw-dust layer. C-l.3 The dish shall then be covered with a sheet of glass and the edges of the dish sealed against the glass with a strip of material, such as ` plasticine ' SOthat the atmosphere round the test pieces shall remain saturated with water vapour. C-1.4 The dish and the contents shall be maintained at 27" -+ 2°C for a period of two weeks, after which the test pieces shall be removed, washed in cold water and whilst still wet, shall be checked for compliance with the requirements of 9.6. 9' INDIAN STANDARDS ON Plywood, Boards, Wood-Based IS: IO-1964 303-1960 652-1960 709-1957 710-1957 848-1957 849-1957 850-1957 851-1957 852-1957 1328-1958 1508-1960 1658-1966 1659-1960 1707-1960 1734-1960 2380-1963 3087-1965 3097-1965 3129-1965 3348-1965 3478-1966 Plywood tea-chests ( second revision ) Laminates and Adhesives RS 4.50 8.00 ( revised ) ......... Plywood for general purposes ( revised ) Medium strength aircraft plywood Marine plywood Synthetic ............... ......... ... ......... ) ... ... ...... Wooden separators for lead-acid storage batteries 2.50 2.00 2.00 I.50 1.50 1.50 2.00 2.50 resin adhesive for plywood ( phenolic and aminoplastic ...... work in wood Cold setting casein glue for wood Synthetic Veneered resin adhesives for construction ............... plywood decorative Natural sour ( Lactic ) casein for gule manufacture Animal glue ...... ... ) ......... 1.50 2'50 3.00 5.00 2.08 4.00 Extenders for use in synthetic resin adhesives ( urea-formaldehyde ............... for plywood Fibre hardboards Blockboards ( revised ) ............ ............ purposes ............ and boards ... ... ... from other Wood wool for general packaging Methods of test for plywood Methods of test for wood particle boards ............ lignocellulosic materials Wood particle Veneered Particle particle boards boards for insulation boards and medium 6.50 4.00 2.50 2.00 boards ( medium density ) for general purposes ... ............ purposes ......... ...... laminates ... laminates ... density wood-based ... ......... ... ... ( com... ( com... Fibre insulation High 4.00 2.00 3.50 3.00 3.00 1.50 3.50 - High density wood particles boards 3513 ( Part I )-1966 preg ) 3513 ( Part II )-1966 preg ) : Part I Electrical purposes : High and medium density wood-based Part II Chemical purposes ... High and medium density wood-based 3513 ( Part III )-1966 ( compreg ) : Part III General purposes ... ... High and medium density 3513 ( Part IV )-1966 ( compreg ) : Part IV Sampling and tests 4834- 1968 *4835-1968 *4859-1968 Veneered-wood boards for packing cases ... Polyvinyl acetate dispersion-based High strength aircraft plywood laminates ... wood-based laminates ... ... ... ... ... ... ... ... ... ... adhesives for wood *Under print. AMENDMENT IS 4834:1968 VENEERED-WOOD 7 DIMENSIONS NO. 1 JANUARY 2005 TO SPECIFICATION FOR BOARDS FOR PACKING CASES ( Pa