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1、BRITISH STANDARD BS 7331:1990 Incorporating Amendment No. 1 Specification for Direct surfaced wood chipboard based on thermosetting resins Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:29:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7331:1990 This Briti
2、sh Standard, having been prepared under the direction of the Plastics Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 30 November 1990 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference PLM/41 D
3、raft for comment 89/35573 DC ISBN 0 580 186555 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics Standards Policy Committee (PLM/-) to Technical Committee PLM/41, upon which the following bodies were represented: Association of Su
4、ppliers to the Furniture Industry Ltd. British Laminated Plastics Fabricators Association Ltd. British Plastics Federation Fibre Building Board Organization Fibre Cement Manufacturers Association Ltd. Furniture Industry Research Association Standards Association of Australia United Kingdom and Irela
5、nd Particleboard Association Society of Motor Manufacturers and Traders Ltd. Amendments issued since publication Amd. No.DateComments 8537March 1995Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:29:22 GMT+00:00 2006, Unc
6、ontrolled Copy, (c) BSI BS 7331:1990 BSI 07-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Classification1 3.1General1 3.2Fire performance1 4Appearance1 4.1Colour matching1 4.2Surface finish1 4.3Surface defects2 5Dimensional tolerances2 5.1Thickness2 5
7、.2Length and width2 5.3Flatness2 5.4Edge straightness2 5.5Squareness2 6Physical properties2 7Marking2 Appendix A Determination of thickness5 Appendix B Determination of length and width5 Appendix C Determination of flatness5 Appendix D Determination of edge straightness5 Appendix E Determination of
8、squareness7 Appendix F Determination of susceptibility to cracking7 Appendix G Determination of surface resistance to water vapour9 Figure 1 Suitable instrument for measuring flatness6 Figure 2 Determination of edge straightness7 Figure 3 Determination of squareness8 Table 1 Classification of direct
9、 surfaced wood chipboards1 Table 2 Tolerances for thickness2 Table 3 Physical properties3 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:29:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7331:1990 ii BSI 07-1999 Fo
10、reword This British Standard has been prepared under the direction of the Plastics Standards Policy Committee. It is a new standard detailing performance specifications for six types of direct surfaced wood chipboard. Appendix A to Appendix G have been included to provide users with information on t
11、est methods to verify that required performance specifications have been achieved. Attention is drawn to BS EN 438-2, BS 3962 and BS 5669 which each contain several of the test methods used in this standard. A British Standard does not purport to include all the necessary provisions of a contract. U
12、sers of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 10, an inside back cover an
13、d a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:29:22 GMT+00:00 2006, Uncont
14、rolled Copy, (c) BSI BS 7331:1990 BSI 07-19991 1 Scope This British Standard is applicable to boards and panels manufactured by directly applying uncured aminoplast resin impregnated papers to both faces of wood chipboard substrates and achieving bonding and curing in the same process using heat and
15、 pressure but without the use of an intermediate adhesive. The cured surfaces may be smooth or textured on one or both faces. The standard specifies the requirements for six types of direct surfaced wood chipboard for interior applications as follows: a) in high humidity conditions, and b) in low an
16、d normal humidity conditions. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard the following definitions apply. 2.1 direct surfaced boards boards produced in manufacturers standard sheet sizes
17、 2.2 direct surfaced panels panels cut to specified sizes from direct surfaced boards 2.3 wood chipboard particle board made exclusively from small particles of wood and a binder 2.4 high humidity ambient relative humidity higher than 80 % 2.5 normal humidity ambient relative humidity of 40 % to 80
18、% 2.6 low humidity ambient relative humidity less than 40 % 3 Classification 3.1 General Direct surfaced boards shall be classified, as shown in Table 1, according to two levels of resistance to wear of the directly applied surface layers and three types of wood chipboard substrate selected from tho
19、se specified in BS 5669-2. 3.2 Fire performance Products specified in this standard shall meet the class 3 surface spread of flame requirements of BS 476-7. NOTEDirect surfaced boards having a class 1 or class 2 rating as determined by BS 476-7 are provided by some manufacturers. Table 1 Classificat
20、ion of direct surfaced wood chipboards 4 Appearance 4.1 Colour matching Where colour matching is required by the purchaser this shall be by comparison with an agreed colour reference sample when inspected under a tungsten illuminant, and in daylight or under a D 6500 standard illuminant as specified
21、 in BS 950-1. NOTESince slight variations in colour will occur due to inherent variation in the surfacing papers and the chipboard core, it is recommended that boards or panels to be used side by side should be selected from the same production batch where possible and matched to ensure colour compa
22、tibility before fabrication or installation. 4.2 Surface finish Where matching of the surface finish is required by the purchaser there shall be no significant difference between the suppliers master reference sample and the specimen under examination, when inspected at different viewing angles. Cla
23、ssificationSurfaceSubstrate DH/C1A DH/C3 DH/C5 DG/C1A DG/C3 DG/C5 High wear resistance High wear resistance High wear resistance General purpose General purpose General purpose General purpose Improved moisture resistance Improved moisture resistance and enhanced mechanical properties General purpos
24、e Improved moisture resistance Improved moisture resistance and enhanced mechanical properties Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:29:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7331:1990 2 BSI 07-1999 NOTESince slight variations in surface f
25、inish will occur due to inherent variation in the surfacing papers and the chipboard core, it is recommended that boards or panels to be used side by side should be selected from the same production batch where possible and matched to ensure surface finish compatibility before fabrication or install
26、ation. 4.3 Surface defects When illuminated by overhead white fluorescent lights of colour temperature approximately 5 000 K, giving an intensity of 800 lx to 1 000 lx and viewed at a distance of 1.5 m, the surface layers of the boards or panels shall appear to be continuous and free from porosity,
27、craters, air bubbles or inclusions of dirt, fibres or paper fragments. 5 Dimensional tolerances 5.1 Thickness Permissible deviations of thickness from the manufacturers specified thickness, shall not exceed the limits specified in Table 2 when measured in accordance with Appendix A. NOTENo requireme
28、nts for nominal thicknesses are specified for boards or panels. Table 2 Tolerances for thickness 5.2 Length and width Permissible deviations from the manufacturers specified length and width of direct surfaced boards shall not exceed 5 mm when measured by the method described in Appendix B. Permissi
29、ble deviations from the manufacturers specified length and width of panels shall not exceed 0.5 mm for dimensions up to and including 1 m or 1 mm for dimensions over 1 m when measured by the method described in Appendix B. NOTENo requirements for nominal length and width are specified for boards or
30、panels. 5.3 Flatness Direct surfaced boards or panels, of nominal thicknesses of 15 mm and above, shall not show a deviation of the surface from the straightedge of more than 1 mm over any 600 mm when measured in accordance with the method described in Appendix C. NOTEThis requirement is only applic
31、able to direct surfaced boards and panels at the time of delivery. Numerous factors, including changes in temperature and relative humidity, in storage and fabrication areas at building sites may cause boards and panels to bow or twist irreversibly. 5.4 Edge straightness The edges of direct surfaced
32、 boards shall not deviate from a straightedge joining adjacent corners by more than 1.5 mm over 1 m when measured by the method described in Appendix D. The edges of direct surfaced panels greater than 200 mm wide shall not deviate from a straightedge joining adjacent corners by more than 0.5 mm ove
33、r 1 m when measured either by the method described in Appendix D or by any other method that gives the same results. NOTEIn case of dispute the procedure described in Appendix D should be used. 5.5 Squareness Boards or panels shall not deviate from squareness by more than 2 mm per 1 m when measured
34、by the method described in Appendix E. 6 Physical properties Boards and panels shall comply with the requirements specified in Table 3. 7 Marking The manufacturer shall mark each batch of boards or panels on the package or on the material itself with the following information: a) number and date of
35、this British Standard i.e. BS 7331:19901); b) classification; c) manufacturer; d) batch number. Board or panel typeThickness rangeTolerance DH/C1A DG/C1A mm 6 to 25 26 to 50 mm 0.4 0.5 DH/C3 DG/C3 DH/C5 DG/C5 6 to 25 26 to 50 0.5 0.6 1) Marking BS 7331:1990 on or in relation to a product represents
36、a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third pa
37、rty certification of conformity, which may also be desirable. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:29:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7331:1990 BSI 07-19993 Table 3 Physical properties PropertyTest methodParameters examinedUnitsReq
38、uirement for classification DH/C1A DH/C3 DH/C5 DG/C1A DG/C3 DG/C5 Resistance to surface wearBS EN 438-2 Clause 6 Wear resistance plain colour print effect Revolutions (min.)300 300 300 80 Resistance to wet heat at 85 C BS 3962-2Appearance gloss finishes other finishes Rating (not lower than)4 5 3 4
39、Resistance to dry heat at 100 C BS 3962-3Appearance gloss finishes other finishes Rating (not lower than)4 5 3 4 Dimensional stability 35 % to 85 % r.h. at 25 C BS 5669-1: 1989 7.1 7.2 Dimensional change length and width thickness % (max.) C1A C3 C5 C1A C3 C5 0.40 0.40 0.30 9 7 5 0.40 0.40 0.30 9 7
40、5 Resistance to impact by small diameter ball BS EN 438-2 Clause 11 Spring forceN (min.)1010 Resistance to crackingAppendix FAppearanceNo cracking Resistance to scrapeBS 3962-6Surface penetration Penetration to substrate Rating (not lower than) 5 5 4 5 Resistance to stainingaBS 3962-4Acetone Butyl a
41、cetate Toilet spirit Potable spirit Tea Coffee Disinfectant (phenol) Disinfectant (chlorol) Paraffin oil Blackcurrant juice Ammonia solution Acetic acid Olive oil Rating (not lower than) 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 Resistance to colour change in xenon arc light BS EN 438-2 Cl
42、ause 16 Colour change relative to blue wool standard Equality with wool standard no. (min.) 66 Surface resistance to water vapour Appendix GAppearanceRating (not lower than) 44 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:29:22 GMT+00:00 2006, Uncontrolled
43、 Copy, (c) BSI BS 7331:1990 4 BSI 07-1999 Table 3 Physical properties PropertyTest methodParameters examinedUnitsRequirement for classification DH/C1A DH/C3 DH/C5 DG/C1A DG/C3 DG/C5 Surface soundnessBS 5669-1: 1989 Clause 17 ForceN (min.)1 3001 300 NOTEThe surface soundness requirement specified in
44、this standard is higher than that specified for types C3 and C5 boards in BS 5669:1979 (now withdrawn). a Concentrations of staining agents used are given in BS 5910-1. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:29:22 GMT+00:00 2006, Uncontrolled Copy, (
45、c) BSI BS 7331:1990 BSI 07-19995 Appendix A Determination of thickness A.1 Principle The thickness of boards or panels is measured using a micrometer. A.2 Test specimens Test direct surfaced boards or panels. A.3 Apparatus A.3.1 Micrometer, graduated to allow readings to an accuracy of 0.01 mm and h
46、aving flat and parallel measuring surfaces, 16 1 mm diameter and means such as a weight, spring or slipping clutch, to apply a pressure of approximately 0.02 N/mm2 to the measuring surfaces. A.4 Procedure Apply the micrometer (A.3.1) to three points selected at random along both long edges of the bo
47、ard or panel at approximately 35 mm in from the edges. Measure the thickness to the nearest 0.05 mm and record the results. A.5 Expression of results Calculate the mean of the six results. Appendix B Determination of length and width B.1 Principle The length and width of direct surfaced boards or pa
48、nels are determined by measurement with a metal tape or rule. B.2 Test specimens Test direct surfaced boards or panels. B.3 Apparatus B.3.1 Steel tape, or rule, of sufficient length to measure the greatest dimension of the test specimen, graduated to allow a reading to an accuracy of 1 mm for boards
49、 and 0.5 mm for panels. B.4 Procedure Apply the steel tape or rule, (B.3.1), to each edge of the board or panel in turn on a line approximately 35 mm from, and parallel to, the edge. Measure each edge to the nearest increment and record the results. B.5 Calculation and expression of results Calculate the mean value of the two pairs of length and width measurements and express, to the nearest increment, as the length and width of the board or panel. Appendix C Determination of flatness C.1 Principle Flatness is determined by meas
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