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AS/NZS 2588:1998 Australian/New Zealand Standard Gypsum plasterboard Accessed by SWINBURNE UNIVERSITY OF TECHNOLOGY on 25 Oct 2014 (Document currency not guaranteed when printed)
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Australian/New Zealand Standard - WordPress.com · AS/NZS 2588:1998 This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee BD/11, Interior Board Linings.

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  • AS/NZS 2588:1998

    Australian/New Zealand Standard

    Gypsum plasterboard

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  • AS/NZS 2588:1998

    This Joint Australian/New Zealand Standard was prepared by Joint TechnicalCommittee BD/11, Interior Board Linings. It was approved on behalf of theCouncil of Standards Australia on 21 November 1997 and on behalf of the Councilof Standards New Zealand on 5 December 1997. It was published on5 February 1998.

    The following interests are represented on Committee BD/11:

    Australian Building Codes BoardAustralian Chamber of Commerce and IndustryFederation of Wall & Ceiling Industries Australia and New ZealandHousing Industry Association, AustraliaInterior Systems Association New ZealandMaster Builders AustraliaNational Association of Forest Industries, AustraliaNational Association of Steel-Framed Housing, Australia

    Review of Standards. To keep abreast of progress in industry, Joint Australian/New Zealand Standards are subject to periodic review and are kept up to date by theissue of amendments or new editions as necessary. It is important therefore thatStandards users ensure that they are in possession of the latest edition, and anyamendments thereto.Full details of all Joint Standards and related publications will be found in the StandardsAustralia and Standards New Zealand Catalogue of Publications; this information issupplemented each month by the magazines The Australian Standard and StandardsNew Zealand, which subscribing members receive, and which give details of newpublications, new editions and amendments, and of withdrawn Standards.Suggestions for improvements to Joint Standards, addressed to the head office of eitherStandards Australia or Standards New Zealand, are welcomed. Notification of anyinaccuracy or ambiguity found in a Joint Australian/New Zealand Standard should bemade without delay in order that the matter may be investigated and appropriate actiontaken.

    This Standard was issued in draft form for comment as DR 96321.

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  • AS/NZS 2588:1998

    Australian/New Zealand Standard

    Gypsum plasterboard

    Originated in Australia as AS 2588 1983.Jointly revised and designated AS/NZS 2588:1998.

    PUBLISHED JOINTLY BY:

    STANDARDS AUSTRALIA1 The Crescent,Homebush NSW 2140 Australia

    STANDARDS NEW ZEALANDLevel 10, Radio New Zealand House,155 The Terrace,Wellington 6001 New Zealand

    ISBN 0 7337 1727 6

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  • AS/NZS 2588:1998 2

    PREFACE

    This Standard was prepared by the Joint Standards Australia /Standards New ZealandCommittee BD/11, Interior Board Linings, to supersede AS 2588 1983. It is one in aseries relating to interior board linings for building purposes. It is based onISO 6308:1980, Gypsum plasterboardSpecification with the following departures:

    (a) Baseboard and rounded edge have not been included.

    (b) Four grades, extra widths and thicknesses and working requirements have beenincluded.

    (c) The testing requirements have been expanded to include edge hardness, nail pullresistance, bond strength, humidified deflection and water resistance.

    (d) The bending strength test includes some minor changes and the pass criteria havebeen updated.

    Gypsum plasterboard has become one of the most commonly used materials for walls andceiling linings in conventional building applications. This Standard provides a generalreference for the building industry and specifiers, and provides a basic standard foradoption in regulations.

    The objective of this Standard is to provide manufacturers of gypsum plasterboard withspecifications covering the manufacture and performance of such plasterboard for use indomestic, commercial and industrial applications.

    The terms normative and informative have been used in this Standard to define theapplication of the appendix to which they apply. A normative appendix is an integralpart of a Standard, whereas an informative appendix is only for information andguidance.

    Copyright STANDARDS AUSTRALIA/ STANDARDS NEW ZEALANDUsers of Standards are reminded that copyright subsists in all Standards Australia and Standards New Zealand publications and software.Except where the Copyright Act allows and except where provided for below no publications or software produced byStandards Australia or Standards New Zealand may be reproduced, stored in a retrieval system in any form or transmitted by any meanswithout prior permission in writing from Standards Australia or Standards New Zealand. Permission may be conditional on anappropriate royalty payment. Australian requests for permission and information on commercial software royalties should be directed tothe head office of Standards Australia. New Zealand requests should be directed to Standards New Zealand.

    Up to 10 percent of the technical content pages of a Standard may be copied for use exclusively in-house by purchasers of theStandard without payment of a royalty or advice to Standards Australia or Standards New Zealand.

    Inclusion of copyright material in computer software programs is also permitted without royalty payment provided such programsare used exclusively in-house by the creators of the programs.

    Care should be taken to ensure that material used is from the current edition of the Standard and that it is updated whenever the Standardis amended or revised. The number and date of the Standard should therefore be clearly identified.

    The use of material in print form or in computer software programs to be used commercially, with or without payment, or in commercialcontracts is subject to the payment of a royalty. This policy may be varied by Standards Australia or Standards New Zealand at any time.

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  • 3 AS/NZS 2588:1998

    CONTENTS

    Page

    1 SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 REFERENCED DOCUMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 CLASSIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 EDGE FINISH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 SUITABILITY FOR DECORATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 PERFORMANCE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

    10 MARKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

    APPENDICESA MEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARD 9B METHOD FOR DETERMINING THICKNESS . . . . . . . . . . . . . . . . . . . . . . 11C METHOD FOR DETERMINING BENDING STRENGTH . . . . . . . . . . . . . . 12D METHOD FOR DETERMINING EDGE HARDNESS . . . . . . . . . . . . . . . . . . 15E METHOD FOR DETERMINING NAIL PULL RESISTANCE . . . . . . . . . . . . 17F METHOD FOR DETERMINING BOND STRENGTH IN TENSION . . . . . . . 20G METHOD FOR DETERMINING HUMIDIFIED DEFLECTION . . . . . . . . . . 23

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  • AS/NZS 2588:1998 4

    STANDARDS AUSTRALIA /STANDARDS NEW ZEALAND

    Australian/New Zealand Standard

    Gypsum plasterboard

    1 SCOPE This Standard specifies requirements for gypsum plasterboard intended foruse in buildings as a lining material for walls, ceilings and partitions and providing asurface suitable for receiving decorative treatments. It includes standard, bracing, water-resistant and fire-resistant grades of gypsum plasterboard.

    NOTES:

    1 Alternative methods for demonstrating compliance with this Standard are given inAppendix A.

    2 Prolonged exposure to heat where the surface temperature of the board exceeds 45C will bedetrimental to the performance of gypsum plasterboard.

    2 APPLICATION This Standard is intended for use by manufacturers to assist inproducing gypsum plasterboard materials, and by end users wishing to specify the correctgrade of gypsum plasterboard material for their specific purposes.

    3 REFERENCED DOCUMENTS The following documents are referred to in thisStandard:

    AS1199 Sampling procedures and tables for inspection by attributes

    1399 Guide to AS 1199 Sampling procedures and tables for inspection byattributes

    2193 Methods for calibration and grading of force-measuring systems of testingmachines

    2753 Adhesives Mastic For bonding gypsum plaster linings to wood and metalframing members

    4055 Wind loads for housing

    AS/NZSISO 9000 Quality management and quality assurance standardsISO 9000.1 Part 1: Guidelines for selection and use

    ISO 9004 Quality management and quality system elementsISO 9004.1 Part 1: Guidelines

    SAA/SANZHB18 Guidelines for third-party certification and accreditationHB18.28 Guide 28 General rules for a model third-party certification scheme for

    products

    ASTMC 473 Test methods for physical testing of gypsum board products and gypsum

    lath

    4 DEFINITIONS For the purpose of this Standard the definitions below apply.

    4.1 Edge the machine-wrapped edge of a gypsum plasterboard sheet.

    4.2 End a factory-cut or field-cut of a gypsum plasterboard sheet which exposes thegypsum core.

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  • 5 AS/NZS 2588:1998

    4.3 Gypsum plasterboard a machine-made board consisting of a core essentially ofcast gypsum plaster and both faces and the longitudinal edges encased in a plasterboardliner which is capable of accepting decoration. It includes the following:

    (a) Bracing grade a gypsum plasterboard that forms part of a system to provide adefined bracing resistance.

    (b) Fire resistant grade a gypsum plasterboard that forms part of a system to providea defined fire resistance. This is generally achieved by additives to the core toimprove core adhesion at high temperatures and the addition of mineral fibres forstrength.

    (c) Water resistant grade gypsum plasterboard which has additives in the core and/orthe paper liners to reduce the water absorption rate.

    4.4 Recessed edge an edge which is tapered on the face side to form a recess forjointing.

    5 CLASSIFICATION Gypsum plasterboard shall be classified by definition(see Clause 4) and by performance requirements (see Clause 9) into the following grades:

    (a) Standard grade.

    (b) Bracing grade.

    (c) Water resistant grade.

    (d) Fire resistant grade.

    6 DIMENSIONS

    6.1 Thickness The nominal thickness of gypsum plasterboard in Australia shall be10 mm, 13 mm, 16 mm or 25 mm and in New Zealand shall be 9.5 mm, 12.5 mm, 16 mmor 19 mm. The average thickness of gypsum plasterboard, when measured in accordancewith Appendix B, shall be within 0.5 mm of the nominal thickness. The thickness rangefor each board measured shall not exceed 0.8 mm for standard grade plasterboard and1.2 mm for fire resistant grade plasterboard.

    NOTE: Other thicknesses of gypsum plasterboard may be manufactured to special order but arenot covered by this Standard.

    6.2 Width The nominal width of gypsum plasterboard shall be 600 mm, 900 mm,1200 mm or 1350 mm. The actual width of gypsum plasterboard shall be within 3 mm ofthe nominal width.

    6.3 Length The length of gypsum plasterboard sheets shall be within 5 mm of thenominal specified length.

    6.4 Squareness The cut ends of the board shall be square with the edges within 3 mmin the full width of the board.

    7 EDGE FINISH Edges of gypsum plasterboard shall be square, recessed or bevelledto suit the specified joint finish. (See Figure 1.)

    8 SUITABILITY FOR DECORATION The gypsum plasterboard should have a facewhich is free from defects such as corrugations, ripples, stains which would bleed througha painted finish or any other defects which would adversely affect decorative paintfinishes.

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  • AS/NZS 2588:1998 6

    DIMENSIONS IN MILLIMETRES

    FIGURE 1 EDGE FINISH

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  • 7 AS/NZS 2588:1998

    9 PERFORMANCE REQUIREMENTS

    9.1 Gypsum plasterboard

    9.1.1 General All classifications of gypsum plasterboard shall comply withClauses 9.1.2 to 9.1.6. In addition, water resistant grade plasterboard shall comply withClause 9.2.

    9.1.2 Bending strength When tested in accordance with Appendix C using the loadsgiven in Table 1, the plasterboard shall not break or delaminate.

    NOTE: The bending strength test is used to ensure the gypsum plasterboard has sufficientstrength to withstand bending during installation and the resistance to in-service loads.

    TABLE 1

    MINIMUM AVERAGE BREAKING FORCESPERPENDICULAR AND PARALLEL TO

    WRAPPED EDGE OF BOARD

    Nominal thicknessof board, mm

    Load, N

    Perpendicular Parallel

    9.5, 1012.5, 13

    161925

    360490670730910

    150200280305380

    9.1.3 Edge hardness When tested in accordance with Appendix D, gypsum plasterboardshall have an edge hardness of not less than 45 N.

    NOTE: The edge hardness test is used to ensure the gypsum plasterboard edge can resistcrushing during handling and installation.

    9.1.4 Nail pull resistance When tested in accordance with Appendix E, gypsumplasterboard shall have minimum nail pull resistance appropriate to its intended use asshown in Table 2.

    NOTE: The nail pull test is used to ensure the gypsum plasterboard has sufficient strength toresist fastener pull through due to in-service loads.

    TABLE 2

    MINIMUM NAIL PULL RESISTANCE

    Walls (studs max.600 mm centres)

    Ceilings(joists/furring max.

    450 mm centres)

    Ceilings(joists/furring max.

    600 mm centres)

    270 N 270 N 300 N

    NOTE: The nail pull resistance requirement is based on the ability of thefastener to withstand a differential pressure of 0.5 kPa, with a suitable safetymargin. The actual pressure was derived from AS 4055 for regions A and Bup to and including wind category N4.

    9.1.5 Bond Strength When tested in accordance with Appendix F, the bond strength intension of the adhesive shall be not less than 250 N after 24 h drying.

    NOTE: The bond strength test is to ensure the gypsum plasterboard paper lining does notdelaminate within the paper plies or from the gypsum core. This is particularly important whereadhesive fastening to the substrate is used.

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  • AS/NZS 2588:1998 8

    9.1.6 Humidified deflection When tested in accordance with Appendix G, the maximumdeflection of the board shall not exceed the figures specified in Table 3.

    NOTE: The humidified deflection test is to ensure the gypsum plasterboard has adequateresistance to in-service deflection or sag due to variable climatic conditions, particularly inceilings.

    TABLE 3

    HUMIDIFIED DEFLECTION

    Test method(Appendix G)

    Maximum deflection, mm

    450 mm cantilever600 mm spanning

    board

    A 50 25

    B 10 5

    9.2 Water resistant grade gypsum plasterboard

    9.2.1 General In addition to the requirements of Clause 9.1 water resistant gradegypsum plasterboard shall comply with Clauses 9.2.2 and 9.2.3.

    9.2.2 Water resistance When tested in accordance with ASTM C 473, the plasterboardshall not exceed 5% W/W after two hours of testing.

    9.2.3 Surface water resistance When tested in accordance with ASTM C 473, theaverage difference between the dry and wet weights of the specimens shall not exceed1.6 g after two hours of testing.

    10 MARKING Each sheet of gypsum plasterboard shall be clearly marked with thefollowing particulars:

    (a) The manufacturers name or trademark.

    (b) Nominal thickness.

    (c) Width.

    (d) Type of edge.

    (e) Product name or classification.

    The grade of plasterboard shall be displayed on the back of the sheet at no greater than1 m intervals. This grading shall be displayed by the use of registered marks, trademarksor other means that clearly classifies the plasterboard.

    NOTE: A date and time mark is commonly also applied to facilitate production control.

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  • 9 AS/NZS 2588:1998

    APPENDIX A

    MEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARD

    (Informative)

    A1 SCOPE This Appendix sets out the following different means by which compliancewith this Standard can be demonstrated by the manufacturer or supplier:

    (a) Evaluation by means of statistical sampling.

    (b) The use of a product certification scheme.

    (c) Assurance using the acceptability of the suppliers quality system.

    (d) Other such means proposed by the manufacturer or supplier and acceptable to thecustomer.

    A2 STATISTICAL SAMPLING Statistical sampling is a procedure which enablesdecisions to be made about the quality of batches of items after inspecting or testing onlya portion of those items. This procedure will only be valid if the sampling plan has beendetermined on a statistical basis and the following requirements are met:

    (a) The sample must be drawn randomly from a population of product of knownhistory. The history must enable verification that the product was made from knownmaterials at essentially the same time by essentially the same processes and underessentially the same system of control.

    (b) For each different situation, a suitable sampling plan needs to be defined. Asampling plan for one manufacturer of given capability and product throughput maynot be relevant to another manufacturer producing the same items.

    In order for statistical sampling to be meaningful to the customer, the manufacturer orsupplier needs to demonstrate how the above conditions have been satisfied. Sampling andthe establishment of a sampling plan should be carried out in accordance with AS 1199,guidance to which is given in AS 1399.

    A3 PRODUCT CERTIFICATION The purpose of product certification is to provideindependent assurance of the claim by the manufacturer that products comply with thestated Standard.

    The certification scheme should meet the criteria described in SAA HB18.28(SANZ HB18.28) in that, as well as full type testing from independently sampledproduction and subsequent verification of conformance, it requires the manufacturer tomaintain effective quality planning to control production.

    The certification scheme serves to indicate that the products consistently conform to therequirements of the Standard.

    A4 SUPPLIERS QUALITY SYSTEM Where the manufacturer or supplier candemonstrate an audited and registered quality management system complying with therequirements of the appropriate or stipulated Australian or international Standard for asuppliers quality system or systems, this may provide the necessary confidence that thespecified requirements will be met. The quality assurance requirements need to be agreedbetween the customer and supplier and should include a quality or inspection and test planto ensure product conformity.

    Guidance in determining the appropriate quality management system is given inAS/NZS ISO 9000.1:1994 and AS/NZS ISO 9004.1:1994.

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  • AS/NZS 2588:1998 10

    A5 OTHER MEANS OF ASSESSMENT If the above methods are consideredinappropriate, determination of compliance with the requirements of this Standard may beassessed by being based on the results of testing coupled with the manufacturersguarantee of product conformance.

    Irrespective of acceptable quality levels (AQLs) or test frequencies, the responsibilityremains with the manufacturer or supplier to supply products that conform with the fullrequirements of the Standard.

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  • 11 AS/NZS 2588:1998

    APPENDIX B

    METHOD FOR DETERMINING THICKNESS

    (Normative)

    B1 SCOPE This Appendix sets out the method for determining the thickness ofgypsum plasterboard.

    B2 PROCEDURE Using a dial micrometer or other suitable calliper gauge, take fivemeasurements to the nearest 0.1 mm across one end of the board, equally spaced acrossthe width and not less than 25 mm from the cut end or 100 mm from a wrapped edge.

    B3 REPORTING The average and the range of the five readings for each sheet shallbe reported to the nearest 0.1 mm.

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  • AS/NZS 2588:1998 12

    APPENDIX C

    METHOD FOR DETERMINING BENDING STRENGTH

    (Normative)

    C1 SCOPE This Appendix sets out the methods for determining the bending strengthof gypsum plasterboard. There are two acceptable methods (A and B) for determining thebending strength. Method A uses a constant rate of cross-head movement whilst Method Buses a constant rate of load.

    C2 TEST SPECIMENS Eight test specimens 300 3 mm (see Note for alternativesample dimension) by 400 10 mm shall be cut from each sheet in the sample so that nopart of a test specimen is nearer than 100 mm to a machine-wrapped or machine-cut edgeof the sheet.

    Four specimens shall have the 300 mm dimension perpendicular to the machine-wrappededge of the board and four shall have the 300 mm dimension parallel to the machine-wrapped edge. These are to be termed the perpendicular and parallel breaking forcespecimens, respectively.

    NOTE: Laboratory evaluation has verified that samples of 100 2 mm may be satisfactorilysubstituted for the specified 300 mm. In this case the reported result should be derived from theactual result multiplied by a factor of three.

    C3 CONDITIONING The test specimens shall be stored at 23 2C and 50 5%relative humidity for a minimum of 12 h.

    C4 METHOD A CONSTANT RATE OF CROSS-HEAD MOVEMENT

    NOTE: This is the preferred method for determining bending strength.

    C4.1 Apparatus Calibrated universal testing machine with a minimum capacity of1 kN and capable of a strain rate of 25 mm/min.

    C4.2 Procedure (see Figure C1) The procedure shall be as follows:

    (a) Place the specimen on two parallel supports at least 300 mm in length and spaced at356 0.4 mm centres. The support edges shall be straight and horizontal and have aradius of 3 mm.

    (b) Of the four perpendicular specimens, test two face-up and test the remaining twoface-down.

    (c) Of the four parallel specimens, test two face-up and test the remaining two face-down.

    NOTE: The specimens are tested face-up and face-down to provide data to indicate theface and back lining paper strength.

    (d) Apply a vertical force uniformly across the full width of the specimen along a lineparallel to and midway between the supports. The member applying the load shallbe straight and horizontal and have a radius of 3 mm along the line of application.

    (e) Apply the test force at a uniform rate of travel of 25 mm/min 5 s until failure ofthe plasterboard occurs.

    (f) Record the failure force to the nearest 5 N.

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  • 13 AS/NZS 2588:1998

    DIMENSIONS IN MILLIMETRES

    FIGURE C1 LAYOUT OF APPARATUS FOR METHOD ACONSTANT RATEOF CROSS-HEAD MOVEMENT

    C5 METHOD B CONSTANT RATE OF LOAD (see Figure C2)

    C5.1 Apparatus A purpose-built testing machine as shown in Figure C2. This type ofapparatus applies a constant load rate generally by allowing lead shot to fall gently from areservoir into the load bucket.

    C5.2 Procedure The procedure shall be as follows:

    (a) Place the specimen on two parallel supports at least 300 mm in length and spaced at356 0.4 mm centres. The support edges shall be straight and horizontal and have aradius of 3 mm.

    (b) Of the four perpendicular specimens, test two face-up and test the remaining twoface-down.

    (c) Of the four parallel specimens, test two face-up and test the remaining two face-down.

    NOTE: The specimens are tested face-up and face-down to provide data to indicate theface and back lining paper strength.

    (d) Balance the beam.

    (e) Apply a vertical force uniformly across the full width of the specimen along a lineparallel to and midway between the supports. The member applying the load shallbe straight and horizontal and have a radius of 3 mm along the line of application.The test force shall be applied at the rate of 250 N/min with a maximum variationof 20% by gently adding lead shot to the load bucket until failure of theplasterboard occurs.

    (f) Record the mass of lead shot, to the nearest 50 g, in the load bucket at point offailure of the plasterboard.

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    C5.3 Calculating the results The actual breaking load, rounded to the nearest 5 N, ofthe plasterboard shall be calculated from the following equation:

    BL = M g r2r

    1

    where

    BL = breaking load, in newtons

    M = mass of lead shot in bucket, in kilograms

    g = force due to gravity (constant 9.8 m/s2)

    r2 = distance along the lever arm from the pivot to the load bucket, in metres

    r1 = distance along the lever arm from the pivot to the triangular load bar, inmetres.

    FIGURE C2 LAYOUT OF APPARATUS FOR METHOD BCONSTANT RATE OF LOAD

    C6 TEST REPORT The following shall be reported:

    (a) Identification of sample as received.

    (b) Any sample preparation or pretreatment.

    (c) Name of laboratory or authority which performed the test.

    (d) Date on which the test was carried out or, if carried out over a period of time, thedates of commencement and completion of the test.

    (e) The average breaking force for the specimens for each test condition for eachdirection of test.

    (f) Any observation, in relation to either the test sample or the performance of the test,which may assist in the correct interpretation of the test results.

    (g) Reference to the test method used, e.g. Method B of Appendix C of AS/NZS 2588.

    (h) Reference to a calibration certificate for an apparatus used, the calibration authorityand the expiry date of the certificate.

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  • 15 AS/NZS 2588:1998

    APPENDIX D

    METHOD FOR DETERMINING EDGE HARDNESS

    (Normative)

    D1 SCOPE This Appendix sets out the method for determining the edge hardness ofgypsum plasterboard.

    D2 APPARATUS The following apparatus is required:

    (a) A calibrated penetrometer having a scale range of at least 0 to 150 N.

    (b) A needle to suit the penetrometer. The needle is to be of 12 SWG stainless steelwith a diameter of 2.64 0.01 mm. The included angle of the point of the needleshall be 17 1. The point shall be machined off 1.59 0.01 mm to give a squaretip.

    (c) A distance piece designed to allow 4.75 0.15 mm protrusion of the needle.NOTE: An Ametek penetrometer, model L-30-m, has been found to be a suitable apparatus forthis test.

    D3 TEST SPECIMEN The test specimen shall consist of any standard productionsheet of gypsum plasterboard.

    D4 CONDITIONING The test specimens shall be conditioned at 23 2C and 50 5%relative humidity for a minimum of 12 h.

    D5 PROCEDURE The test procedure shall be as follows:

    (a) Ensure the spring mechanism is released by pressing the release pin, and the dialpointer is locked at the reading position by sliding the release pin to off.

    (b) Zero the dial by rotating the dial glass circumference.

    (c) Select an area of bound edge not less than 100 mm from a machine cut end. Pushthe penetrometer needle firmly into a bound edge until the distance piece comes intocontact with the surface. Repeat this operation twice in the vicinity of the firstmeasurement, though not in the same needle hole (see Figure D1).

    (d) Record the highest of these three readings.

    (e) Repeat Steps (b), (c) and (d) a further two times for different areas of the boundedge of the board.

    (f) Of the three highest readings recorded, calculate and record the average reading.

    FIGURE D1 TESTING FOR EDGE HARDNESS

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    D6 TEST REPORT The following shall be reported:

    (a) Identification of sample as received.

    (b) Any sample preparation or pretreatment.

    (c) Name of laboratory or authority which performed the test.

    (d) Date on which the test was carried out or, if carried out over a period of time, thedate of commencement and completion of the test.

    (e) The average reading calculated from Paragraph D5(f).

    (f) Any observation, in relation to either the test sample or the performance of the test,which may assist in the correct interpretation of the test results.

    (g) Reference to the test method used, e.g. Appendix D of AS/NZS 2588.

    (h) Reference to a calibration certificate for an apparatus used, the calibration authorityand the expiry date of the certificate.

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  • 17 AS/NZS 2588:1998

    APPENDIX E

    METHOD FOR DETERMINING NAIL PULL RESISTANCE

    (Normative)

    E1 SCOPE This Appendix sets out the methods for determining nail pull resistance ofgypsum plasterboard for applications that require mechanical fixings.

    The test determines the ability of the gypsum plasterboard board to resist nail pull-throughby evaluating the load required to push a standard nail head through the board. There aretwo acceptable methods (A and B) for determining the nail pull resistance. Method A usesa constant strain rate and Method B uses a constant load rate.

    E2 APPARATUS The following apparatus is required:

    (a) Test machine as detailed in Method A or Method B (refer Paragraphs E5.1 and E6.1respectively).

    (b) Standard test nail which has a shank diameter between 2.45 mm and 2.60 mm and ahead diameter between 6.2 mm and 6.5 mm. See Figure E1.

    (c) Specimen support plate with a 75 2 mm diameter hole.(d) A standard 2.75 mm diameter twist drill.

    E3 TEST SPECIMEN AND SAMPLE PREPARATION Cut six specimens150 10 mm 150 10 mm from a strip cut across the width of the plasterboard.Specimens shall not be taken closer than 100 mm from the end or bound edge of theboard.

    Drill a pilot hole through the thickness of the gypsum plasterboard in the centre of eachtest specimen, perpendicular to the face.

    E4 CONDITIONING The test specimens shall be stored at 23 2C and 50 5%relative humidity for a minimum of 12 h.

    E5 METHOD A CONSTANT RATE OF CROSS-HEAD MOVEMENT

    NOTE: This is the preferred method for determining nail pull resistance.

    E5.1 Apparatus (see Paragraph E2) A calibrated universal testing machine with aminimum capacity of 1 kN and capable of a strain rate of 25 mm/min.

    E5.2 Procedure The test procedure shall be as follows:

    (a) Centre each specimen face up on the base plate and manually lower the cross headuntil the shank of the test nail is located in the pilot hole.

    (b) Set the universal machine cross-head speed at 25 mm/min and test.

    (c) Record the maximum load for all six specimens.

    (d) Calculate and record the average of the loads given in Step (c).

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  • AS/NZS 2588:1998 18

    FIGURE E1 CONSTANT LOAD TESTING MACHINE AND STANDARD NAIL

    E6 METHOD B CONSTANT RATE OF LOAD

    NOTE: This method should only be used when there is no access to a universal testing machine.

    E6.1 Apparatus (see Paragraph E2) A purpose-built testing machine as shown inFigure E1. This type of apparatus applies a constant load rate generally by allowing leadshot to fall gently from a reservoir into the load bucket.

    E6.2 Procedure The test procedure shall be as follows:

    (a) Centre each specimen face up on the base plate and manually lower the cross headuntil the shank of the test nail is located in the pilot hole.

    (b) Gently add lead shot to the load bucket to apply a load to the board at the rate of250 N/min with a maximum variation of 20% until the standard nail penetrates thegypsum plasterboard.

    (c) Record the maximum load for all six specimens using the following equation:

    NP = M g r2r

    1

    where

    NP = nail pull, in newtons

    M = mass of lead shot in bucket, in kilograms

    g = force due to gravity (constant 9.8 ms2)

    r2 = distance along the lever arm from the pivot to the load bucket, in metres

    r1 = distance along the lever arm from the pivot to the triangular load bar, inmetres.

    (d) Calculate and record the average of the loads given in Step (c).

    E7 TEST REPORT The following shall be reported:

    (a) Identification of sample as received.

    (b) Any sample preparation or pretreatment.

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  • 19 AS/NZS 2588:1998

    (c) Name of laboratory or authority which performed the test.

    (d) Date on which the test was carried out or, if carried out over a period of time, thedates of commencement and completion of the test.

    (e) The average load in newtons on the test nail as calculated in Paragraphs E5.2(d) orE6.2(d).

    (f) Any observation, in relation to either the test sample or the performance of the test,which may assist in the correct interpretation of the test results.

    (g) Reference to the test method used, e.g. Method A of Appendix E of AS/NZS 2588.

    (h) Reference to a calibration certificate for an apparatus used, the calibration authorityand the expiry date of the certificate.

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  • AS/NZS 2588:1998 20

    APPENDIX F

    METHOD FOR DETERMINING BOND STRENGTH IN TENSION

    (Normative)

    F1 SCOPE This Appendix sets out the method for determining the bond strength intension of gypsum plasterboard.

    F2 PRINCIPLE A test assembly is loaded in tension, producing a tensile force on thegypsum plasterboard liner. The value of the load at failure enables the bond strength intension of the gypsum plasterboard to be determined.

    F3 APPARATUS The following apparatus is required:

    (a) Square ended spatula.

    (b) One block of metal, 50 1 mm 50 1 mm 5 mm (minimum) high.(c) Three pieces of gypsum plasterboard, of minimum size 70 mm 70 mm taken from

    the same sheet but not within 100 mm of an edge cut or cut end.

    (d) One 10 mm cup hook or other suitable means of attachment.

    (e) Two 1 mm nominal external diameter metal spacers, approximately 70 mm long.

    (f) Calibrated tensile testing machine, complying with the Grade B requirements ofAS 2193.

    (g) Suitable weight having a mass of 7 kg.

    (h) Mastic adhesive in accordance with AS 2753.

    F4 PREPARATION OF TEST ASSEMBLIES The preparation of test assembliesshall be as follows:

    (a) Condition the gypsum plasterboard at a temperature of 23 2C and 50 5% relativehumidity and the metal block and adhesive at a temperature of 23 2C for aminimum of 12 h immediately preceding the preparation of test assemblies.

    (b) Locate means of attachment centrally in the face of the block opposite to the faceselected for bonding. Ensure that when the load is applied it is applied axially to thetest block.

    (c) Using the spatula, apply the adhesive under test to one side of the block to a wetthickness of approximately 2 mm.

    (d) Immediately press the adhesive coated face of the block centrally and square ontothe back of the piece of gypsum plasterboard until the adhesive just starts tosqueeze out.

    (e) Insert two spacers into the assembly as shown in Figure F1.

    (f) Immediately compress the assembly under a weight of 7 kg mass. Immediatelyremove the weight. Pull out the spacers, taking care not to disturb the blockalignment.

    (g) Using a square cut, remove excess adhesive with the spatula.

    (h) Condition the test assembly at a temperature of 23 2C and 50 5% relativehumidity for 24 h.

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  • 21 AS/NZS 2588:1998

    DIMENSIONS IN MILLIMETRES

    FIGURE F1 TESTING FOR BOND STRENGTH

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  • AS/NZS 2588:1998 22

    F5 TEST PROCEDURE The procedure shall be as follows for each assembly:

    (a) Determine the load at failure of each assembly by loading in tension in the tensilestrength testing machine at a rate of jaw separation of 50 mm/min. The plasterboardshall be supported at least along the edges at right angles to the grain direction ofthe paper.

    (b) Record the tensile force in newtons required to rupture each of the three assemblies.

    (c) Calculate the average of the three forces given in Step (b).

    F6 TEST REPORT The following shall be reported:

    (a) Identification of sample as received.

    (b) Any sample preparation or pretreatment.

    (c) Name of laboratory or authority which performed the test.

    (d) Date on which the test was carried out or, if carried out over a period of time, thedates of commencement and completion of the test.

    (e) The average tensile force in newtons as calculated in Paragraph F5(c).

    (f) Any observation, in relation to either the test sample or the performance of the test,which may assist in the correct interpretation of the test results.

    (g) Reference to the test method used, e.g. Appendix F of AS/NZS 2588.

    (h) Reference to a calibration certificate for an apparatus used, the calibration authorityand the expiry date of the certificate.

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  • 23 AS/NZS 2588:1998

    APPENDIX G

    METHOD FOR DETERMINING HUMIDIFIED DEFLECTION

    (Normative)

    G1 SCOPE This Appendix sets out two Methods (A and B) for determining thehumidified deflection of gypsum plasterboard. Either method is suitable for use.Method A is the cantilever method and Method B is the simply supported method.

    G2 APPARATUS The following apparatus is required:

    (a) Controlled environment cabinet.

    (b) Straightedge.

    (c) Measuring device accurate to 0.1 mm.

    (d) Board supports with a bearing surface radiused to 3.2 0.05 mm (Method B only).

    G3 TEST SPECIMENS

    G3.1 Method A: Cantilever method Cut one specimen 100 1 mm in the machinedirection and 550 1 mm in the cross direction approximately on the centre-line and atleast 300 mm from the end of the sampled board.

    G3.2 Method B: Simply supported method Cut one specimen 300 1 mm in themachine direction and 610 1 mm in the cross direction approximately on the centre-lineand at least 300 mm from the end of the sampled board.

    G4 CONDITIONING The test specimens shall be stored flat and on edge at 23 2Cand 50 5% relative humidity (RH) for a minimum of 12 h before testing.

    G5 TEST PROCEDURES

    G5.1 Method A: Cantilever method

    NOTE: This is the preferred method for determining deflection.

    The test procedure shall be as follows:

    (a) Determine initial deflection.

    (b) Securely place the test piece, face up, in the controlled environment cabinet(32 2C and 90 3% RH) on a level shelf so that the test specimen overhangs theshelf by 450 1 mm.

    (c) Leave in the controlled environment cabinet for 24 hours.

    (d) Measure and record the deflection and calculate the induced deflection as thedifference between the initial and final deflection at the unsupported end of the testpiece using the straight edge and the measuring device. Ensure that measurement ofdeflection does not alter the deflection due to testing.

    G5.2 Method B: Simply supported method

    The test procedure shall be as follows:

    (a) Determine initial deflection.

    (b) Place the test piece face down in the controlled environment cabinet (32 2C and90 3% RH) on two parallel and level supports spaced 584 2 mm apart and whosebearing surfaces are radiused to 3.2 0.05 mm.

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  • AS/NZS 2588:1998 24

    (c) Leave in the controlled environment cabinet for 48 h.

    (d) Measure and record the maximum deflection and calculate the induced deflection asthe difference between initial and final deflection as the distance between thestraightedge placed on the top ends of the test piece and the upper surface of thetest piece. Ensure that measurement of deflection does not alter the deflection due totesting.

    NOTE: This maximum deflection would normally occur at the mid-span of the testspecimen.

    G6 TEST REPORT The following shall be reported:

    (a) Identification of sample as received.

    (b) Any sample preparation or pretreatment.

    (c) Name of laboratory or authority which performed the test.

    (d) Date on which the test was carried out or, if carried out over a period of time, thedates of commencement and completion of test.

    (e) The induced deflection in millimetres.

    (f) Any observation in relation to either the test sample or the performance of the testwhich may assist in the correct interpretation of the test results.

    (g) Reference to the test method used, e.g. Method A of Appendix G of AS/NZS 2588.

    (h) Reference to a calibration certificate for an apparatus used, the calibration authorityand the expiry date of the certificate.

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  • This page has been left intentionally blank.

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    AS/NZS 2588:1998 GYPSUM PLASTERBOARDPREFACECONTENTS1 SCOPE2 APPLICATION3 REFERENCED DOCUMENTS4 DEFINITIONS4.1 Edge4.2 End4.3 Gypsum plasterboard4.4 Recessed edge

    5 CLASSIFICATION6 DIMENSIONS6.1 Thickness6.2 Width6.3 Length6.4 Squareness

    7 EDGE FINISH8 SUITABILITY FOR DECORATION9 PERFORMANCE REQUIREMENTS9.1 Gypsum plasterboard9.1.1 General9.1.2 Bending strength9.1.3 Edge hardness9.1.4 Nail pull resistance9.1.5 Bond Strength9.1.6 Humidified deflection

    9.2 Water resistant grade gypsum plasterboard9.2.1 General9.2.2 Water resistance9.2.3 Surface water resistance

    10 MARKINGAPPENDIX A - MEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARDA1 SCOPEA2 STATISTICAL SAMPLINGA3 PRODUCT CERTIFICATIONA4 SUPPLIER'S QUALITY SYSTEMA5 OTHER MEANS OF ASSESSMENT

    APPENDIX B - METHOD FOR DETERMINING THICKNESSB1 SCOPEB2 PROCEDUREB3 REPORTING

    APPENDIX C - METHOD FOR DETERMINING BENDING STRENGTHC1 SCOPEC2 TEST SPECIMENSC3 CONDITIONINGC4 METHOD A-CONSTANT RATE OF CROSS-HEAD MOVEMENTC4.1 ApparatusC4.2 Procedure

    C5 METHOD B-CONSTANT RATE OF LOAD C5.1 ApparatusC5.2 ProcedureC5.3 Calculating the results

    C6 TEST REPORT

    APPENDIX D - METHOD FOR DETERMINING EDGE HARDNESSD1 SCOPED2 APPARATUSD3 TEST SPECIMEND4 CONDITIONINGD5 PROCEDURED6 TEST REPORT

    APPENDIX E - METHOD FOR DETERMINING NAIL PULL RESISTANCEE1 SCOPEE2 APPARATUSE3 TEST SPECIMEN AND SAMPLE PREPARATIONE4 CONDITIONINGE5 METHOD A-CONSTANT RATE OF CROSS-HEAD MOVEMENTE5.1 ApparatusE5.2 Procedure

    E6 METHOD B-CONSTANT RATE OF LOADE6.1 ApparatusE6.2 Procedure

    E7 TEST REPORT

    APPENDIX F - METHOD FOR DETERMINING BOND STRENGTH IN TENSIONF1 SCOPEF2 PRINCIPLEF3 APPARATUSF4 PREPARATION OF TEST ASSEMBLIESF5 TEST PROCEDUREF6 TEST REPORT

    APPENDIX G - METHOD FOR DETERMINING HUMIDIFIED DEFLECTIONG1 SCOPEG2 APPARATUSG3 TEST SPECIMENSG3.1 Method A: Cantilever methodG3.2 Method B: Simply supported method

    G4 CONDITIONINGG5 TEST PROCEDURESG5.1 Method A: Cantilever methodG5.2 Method B: Simply supported method

    G6 TEST REPORT

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