1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 26842-2:2013Adhesives Test methods forthe evaluation and selectionof adhesives for indoor woodproductsPart 2: Resistance to delamination in severeenvironmentsBS ISO 26842-
2、2:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 26842-2:2013.It supersedes BS ISO 26842-2:2009 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/52, Adhesives.A list of organizations represented on this co
3、mmittee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 71906 6ICS 83.180C
4、ompliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2013.Amendments issued since publicationDate Text affectedBS ISO 26842-2:2013 ISO 2013Adhesives Test methods
5、 for the evaluation and selection of adhesives for indoor wood products Part 2: Resistance to delamination in severe environmentsAdhsifs Mthodes dessai pour lvaluation et la slection des adhsifs destins aux produits en bois pour lusage intrieur Partie 2: Rsistance la dlamination dans des environneme
6、nts svresINTERNATIONAL STANDARDISO26842-2Second edition2013-06-01Reference numberISO 26842-2:2013(E)BS ISO 26842-2:2013ISO 26842-2:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
7、 or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO
8、copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 26842-2:2013ISO 26842-2:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Principle 14 A
9、pparatus . 25 Specimens 25.1 Preparation and number 25.2 Conditioning 26 Delamination-resistance grades 37 Delamination-resistance tests . 38 Procedure. 39 Assessment of the delamination-resistance grade chosen 410 Test report . 4Annex A (informative) Report form . 6Bibliography 7BS ISO 26842-2:2013
10、ISO 26842-2:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a sub
11、ject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (I
12、EC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be
13、noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any
14、 or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patentsAny trade name used in this document is information given for the convenience of users and
15、 does not constitute an endorsement.The committee responsible for this document is ISO/TC 61, Plastics, Subcommittee SC 11, Products.This second edition replaces the first edition (ISO 26842-2:2009), of which it constitutes a minor revision.ISO 26842 consists of the following parts, under the genera
16、l title Adhesives Test methods for the selection and evaluation of adhesives for indoor wood products: Part 1: Resistance to delamination in non-severe environments Part 2: Resistance to delamination in severe environmentsiv ISO 2013 All rights reservedBS ISO 26842-2:2013INTERNATIONAL STANDARD ISO 2
17、6842-2:2013(E)Adhesives Test methods for the evaluation and selection of adhesives for indoor wood products Part 2: Resistance to delamination in severe environmentsSAFETY STATEMENT Persons using this document should be familiar with normal laboratory practice, if applicable. This document does not
18、purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any regulatory conditions.It is recognized that some of the materials permitted in this document mig
19、ht have a negative environmental impact. As technological advances lead to more acceptable alternatives for such materials, they will be eliminated to the greatest extent possible.At the end of the test, care should be taken to dispose of all waste in an appropriate manner in accordance with local r
20、egulations.1 ScopeThis part of ISO 26842 gives guidelines to select, by means of delamination-resistance tests, adhesive/wood combinations for use in wood products placed in severe environments, in which the products are exposed to extreme change of temperature and humidity. A series of exposure cyc
21、les at various temperature and humidity values is provided to verify that the adhesive selected, or a product bonded with the adhesive, meets the necessary requirements for resistance to delamination.This part of ISO 26842 is intended to help the user not only to select a suitable adhesive, but also
22、 to evaluate adhesives and adhesively bonded wood products.NOTE When actual wood products are tested using this method, the test results might not be comparable because the test laboratory will not normally have had adequate control over the way the product was assembled.This part of ISO 26842 is no
23、t intended for use in the qualification of structural components.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, th
24、e latest edition of the referenced document (including any amendments) applies.ISO 6238, Adhesives Wood-to-wood adhesive bonds Determination of shear strength by compressive loadingISO 9424, Wood-based panels Determination of dimensions of test piecesISO 16999, Wood-based panels Sampling and cutting
25、 of test pieces3 PrincipleTest specimens or actual products that have been bonded with the test adhesive are placed in chambers at a specified temperature and humidity for a length of time and/or number of cycles depending on the grade of resistance to delamination under consideration. On completion
26、 of this exposure, the length of any delamination at the bond line is determined as a percentage of the overall length. If the length of ISO 2013 All rights reserved 1BS ISO 26842-2:2013ISO 26842-2:2013(E)delamination does not exceed 10 %, the adhesive can be certified as complying, under the test c
27、onditions used, with the requirements of the grade of resistance to delamination under consideration.4 ApparatusNOTE Apparatus that includes the features of all the chambers specified in 4.1 to 4.4, might be available, in which case it will not be necessary to have one of each and also air is circul
28、ating at a velocity of (2,25 0,25) m/s.4.1 Conditioning chamber, capable of being maintained either at a temperature of (23 2) C and a relative humidity of (50 5) % or at a temperature of (20 2) C and a relative humidity of (65 5) %.4.2 Dry-heat chamber, capable of being maintained at temperatures o
29、f (50 2) C and (80 2) C, with no provision for humidity control.NOTE These temperatures can be experienced in the bottom of ships sailing in tropical seas or on heated floors.4.3 Cold chamber, capable of being maintained at temperatures of (20 3) C and (30 3) C, with no provision for humidity contro
30、l.NOTE These temperatures can be experienced inside warehouses in cold latitudes.4.4 Humidity chambers, capable of being maintained at relative humidity of 20 % and 90 %, and fitted with the following:a) equipment capable of maintaining the temperature at (50 2) C and measuring it to within 2 C;b) e
31、quipment capable of measuring the relative humidity to within 3 %.5 Specimens5.1 Preparation and numberTest specimens shall be parallel two-ply laminates of dimensions 300 mm (width) 300 mm (length) 7,5 mm (thickness), prepared in accordance with ISO 6238 and measured in accordance with ISO 9424. Th
32、e wood shall be cut to size in accordance with ISO 16999 and then adhesively bonded. Other test specimen dimensions may be agreed upon between the wood product manufacturer and the supplier of the adhesive, depending on the purpose of the test.For each grade of resistance to delamination and specifi
33、c set of test conditions within the grade, a minimum of 10 specimens is required.NOTE If appropriate, actual adhesively bonded products can be tested using the test requirements and conditions specified in this part of ISO 26842.These specimens shall be prepared in accordance with ISO 16999.5.2 Cond
34、itioningPrior to testing, condition all specimens in the conditioning chamber (4.1) at the standard atmospheric conditions of (23 2) C and (50 5) % RH, unless agreed otherwise at a minimum of 88 h. If a longer conditioning period is deemed necessary, the wood product manufacturer and the manufacture
35、r of the adhesive should agree on a longer time. NOTE For actual bonded products, 88 h might not be sufficient.Specimens should be conditioned to the equilibrium moisture content corresponding to the specified use conditions.2 ISO 2013 All rights reservedBS ISO 26842-2:2013ISO 26842-2:2013(E)Conditi
36、oning shall be carried out after the adhesive has been cured in accordance with the material specification or as specified by the manufacturer of the adhesive.6 Delamination-resistance gradesTwo grades of resistance to delamination are specified, each representing a different type of use, i.e. the d
37、ifferent conditions of temperature and humidity which different adhesively bonded wood products may experience in service: grade 3 of resistance to delamination applies to high-durability indoor use (e.g. chair legs, fixtures, musical instruments); grade 4 of resistance to delamination applies to se
38、mi-outdoor use (e.g. window frames and flooring exposed to the sunlight near windows);7 Delamination-resistance testsThe following four tests, which take into consideration the meteorological conditions of service and transport, shall be used in this part of ISO 26842: test A cyclic hot/cold test, i
39、ntended for testing using temperature variation only; test B cyclic humid/dry test, intended for testing at a fixed temperature using humidity variation only; test C hot and humid test, intended to represent the conditions of service or transport in tropical regions; test D hot and dry test, intende
40、d to represent the conditions of service or transport in desert regions.Details of these tests are given in Tables 1 and 2.8 ProcedureSelect a grade of resistance to delamination based on the conditions in which the wood product is expected to be used (see Clause 6) and then select a suitable grade
41、of resistance to delamination based on the expected meteorological conditions of service and transport (see Clause 7).Conduct the tests of resistance to delamination in accordance with Table 1 and Table 2, placing the test specimens at least 50 mm apart with the end-grain surfaces parallel to the ai
42、r flow in the chamber appropriate to the particular test being sure to keep the grain direction of the wood oriented to the direction of the air flow in the chamber. For test A, place the specimens in a cold chamber (4.3) for the specified length of time, then immediately transfer them to a dry-heat
43、 chamber (4.2) or programme the fastest change of atmosphere in an automatic climate chamber for the specified length of time. Carry out the number of cycles specified in Table 1. For test B, place the specimens in a humidity chamber (4.4) at the higher humidity for the specified length of time, the
44、n immediately transfer them to a humidity chamber (4.4) or programme the fastest change of atmosphere in an automatic climate chamber at the lower humidity for the specified length of time. Carry out the number of cycles specified in Table 1. For tests C and D, place the specimens in a humidity cham
45、ber (4.4) for the specified length of time.Except when transferring the specimens from one chamber to another, do not remove them from the chamber until the test has been completed. ISO 2013 All rights reserved 3BS ISO 26842-2:2013ISO 26842-2:2013(E)At the end of the final test period, measure and r
46、ecord the total length of delamination of each specimen at the bond line.Table 1 Delamination-resistance gradesDelamination-resistance gradeDelamination-resistance test and test conditionsTest A Test B Test C Test D3 A2 10 cycles B1 1 cycle C1 7 days D1 7 days4 A1 10 cycles B1 2 cycles C1 14 days D1
47、 14 daysTable 2 Delamination-resistance tests and test conditionsTest cycle Conditions for 1 cycleA1 30 C for 16 h/80 C for 8 hA2 20 C for 16 h/50 C for 8 hB1 50 C, 90 % RH for 2 days/50 C, 20 % RH for 5 daysC1 50 C, 90 % RHD1 50 C, 20 % RH9 Assessment of the delamination-resistance grade chosenWith
48、in an hour (1 h) of the test period specified in Table 1, visually examine each test specimen as it is removed from the test condition using a magnifying glass with a magnification of ca. 10x and with strong lighting recommended. Immediately measure and record, to the nearest 1 mm, and record the le
49、ngth of any delamination (bond line separation) in each of the four edges of each specimen. Calculate the total delamination length by adding together the individual delamination lengths recorded for the bond lines in the edges of all the specimens.If the percentage delamination, i.e. the total delamination length divided by the total length of the bond lines in all four edges of all the specimens multiplied by 100, does not exceed 10 %, the adhes
