1、Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/07/2008 02:08, Uncontrolled Copy, (c) BSIg49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58b
2、earing timber structures Classification and performance requirementsICS 83.180Adhesives One component polyurethane for load BRITISH STANDARDBS EN 15425:2008BS EN 15425:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/07/2008 02:08, Uncontrolled Copy, (c) BSIThis British Standard was pub
3、lished under the authority of the Standards Policy and Strategy Committee on 31 March 2008 BSI 2008ISBN 978 0 580 56148 1Amendments/corrigenda issued since publicationDate CommentsCompliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard
4、is the UK implementation of EN 15425:2008.The UK participation in its preparation was entrusted to Technical Committee PRI/52, Adhesives.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary pr
5、ovisions of a contract. Users are responsible for its correct application.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 15425February 2008ICS 83.180English VersionAdhesives - One component polyurethane for load bearingtimber structures - Classification and performance requirementsAdhsifs - Adhsi
6、fs polyurthane monocomposants pourcharpentes en bois portantes - Classification et exigencesrelatives la performanceKlebstoffe - Einkomponenten-Klebstoffe aufPolyurethanbasis fr tragende Holzbauteile - Klassifizierungund LeistungsanforderungenThis European Standard was approved by CEN on 5 January 2
7、008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on
8、 application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Cent
9、re has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
10、Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any mean
11、s reservedworldwide for CEN national Members.Ref. No. EN 15425:2008: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/07/2008 02:08, Uncontrolled Copy, (c) BSIEN 15425:2008 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .5 4 Classification5 5 Requi
12、rements.5 6 Test methods7 7 Working properties of the adhesive.8 Annex A (normative) Climatic treatment prior to shear test.9 Annex B (normative) Cyclic treatments of test samples prior to delamination test 10 BS EN 15425:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/07/2008 02:08, U
13、ncontrolled Copy, (c) BSIEN 15425:2008 (E) 3 Foreword This document (EN 15425:2008) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of which is held by AENOR. This European Standard shall be given the status of a national standard, either by publication of an identic
14、al text or by endorsement, at the latest by August 2008, and conflicting national standards shall be withdrawn at the latest by August 2008. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held resp
15、onsible for identifying any or all such patent rights. This European Standard is one of a series dealing with one component polyurethane adhesives for use in prefabricated components for timber structures. It is published in support of Eurocode 5. The series consists of: classification and performan
16、ce requirements for polyurethane adhesive for use in different climatic conditions (EN 15425), six test methods to assess the performance of adhesives after specified heat and humidity treatments (EN 302: Part 1 to 4, EN 15416-2 and EN 15416-3), and two test methods to characterize the working prope
17、rties of the adhesive (EN 15416-4 and EN 15416-5). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
18、Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 15425:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/07/2008 02:08, Unc
19、ontrolled Copy, (c) BSIEN 15425:2008 (E) 4 1 Scope This European Standard establishes a classification for one component polyurethane adhesives according to their suitability for use in pre-fabricated timber components for structural use in defined climatic exposure conditions, and specifies perform
20、ance requirements for such adhesives for the industrial manufacture of load-bearing timber structures only. The performance requirements of this European Standard apply to the adhesive only, not to the structure. This European Standard does not primarily cover the performance of adhesives for the pr
21、oduction of wood-based panels. This European Standard is primarily intended for the use of adhesive manufacturers and for the use in timber structures bonded with adhesives, to assess or control the quality of adhesives. This European Standard only specifies the performance of an adhesive for use in
22、 an environment corresponding to the defined conditions. Such an adhesive meeting the requirements of this European Standard for its type is adequate for use in a load-bearing timber structure, provided that the bonding process has been carried out according to an appropriate product standard. 2 Nor
23、mative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 302-1, Adhesives for load-be
24、aring timber structures - Test methods - Part 1: Determination of bond strength in longitudinal tensile shear strength EN 302-2, Adhesives for load-bearing timber structures - Test methods - Part 2: Determination of resistance to delamination EN 302-3, Adhesives for load-bearing timber structures -
25、Test methods - Part 3: Determination of the effect of acid damage to wood fibres by temperature and humidity cycling on the transverse tensile strength EN 302-4, Adhesives for load-bearing timber structures - Test methods - Part 4: Determination of the effects of wood shrinkage on the shear strength
26、 EN 923:2005, Adhesives - Terms and definitions EN 1995-1-1, Eurocode 5: Design of timber structures Part 1-1: General - Common rules and rules for buildings EN 15416-2, Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test methods - Part 2: Static load test of mul
27、tiple bondline specimens in compression shear EN 15416-3, Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test methods - Part 3: Creep deformation test at cyclic climate conditions with specimens loaded in bending shear EN 15416-4, Adhesives for load bearing timbe
28、r structures other than phenolic and aminoplastic - Test methods - Part 4: Determination of open assembly time for one component polyurethane adhesives EN 15416-5, Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test methods - Part 5: Determination of conventional
29、 pressing time BS EN 15425:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/07/2008 02:08, Uncontrolled Copy, (c) BSIEN 15425:2008 (E) 5 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923:2005 apply. 4 Classification Adhesives for struct
30、ural use shall produce joints of such strength and durability that the integrity of the bond is maintained in the assigned service class throughout the expected life of the structure. Two types of adhesives, I and II, are classified according to their suitability for use in the climatic conditions g
31、iven in Table 1. Table 1 Adhesive types for use in different climatic conditions Adhesive type Temperature Climatic equivalent to: a)Examples Equivalent to EN 1995-1-1 service classes: I 50 C Not specified Prolonged exposure to high temperature. 1,2,3 I 50 C 85 % RH at 20 C Full exposure to weather.
32、 1,2,3 II 50 C 85 % RH at 20 C Heated and ventilated building. Exterior protected from weather. Short periods of exposure to weather. 1,2 a)85 % RH at 20 C will result in a moisture content of ca. 20 % in softwoods and most hardwoods, and a lower moisture content in wood-based panels. 5 Requirements
33、 5.1 General Adhesives conforming to this European Standard shall meet the performance requirements specified in 5.2 to 5.7 when tested in accordance with Clause 6 of this European Standard. The bondline thickness shall be limited to a maximum of 0,3 mm. 5.2 Bond strength in longitudinal tensile she
34、ar strength When tested in accordance with 6.2 of this European Standard, the tensile shear strength values of glue line thickness 0,1 mm (thin glue line) and glue line thickness of 0,5 mm shall meet the requirements given in Table 2. BS EN 15425:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STAND
35、ARDS, 10/07/2008 02:08, Uncontrolled Copy, (c) BSIEN 15425:2008 (E) 6 Table 2 Minimum mean tensile shear strength, N/mm, of 0,1 mm and 0,5 mm thick glue lines after treatment according to Annex A Treatment (see Annex A) 0,1 mm thick glue line Type I Type II 0,5 mm thick glue line Type I Type II A1 1
36、0 10 9 9 A2 6 6 5 5 A3 8 8 7,2 7,2 A4 6 NRa)5 NRa)A5 8 NRa)7,2 NRa)A6 NRa)9,5 NRa)7,2 A7 8 NRa)6,5 NRa)a)Treatment cycle not required. 5.3 Resistance to delamination When tested in accordance with 6.3 of this European Standard the limits on delamination shall be those specified in Table 3. Table 3 R
37、esistance to delamination after treatment according to Annex B Treatment (see Annex B) Maximum delamination of any test sample (% of total glue line length) Adhesive type I Adhesive type II B1 NRa) 10B2 5 NRa)a)Treatment cycle not required. 5.4 Tensile strength perpendicular to the bondline after cl
38、imatic treatment When tested in accordance with 6.4 of this European Standard the average tensile strength of the untreated reference samples shall not be lower than 5 N/mm2. The average tensile strength after cyclic treatment shall not be lower than 80 % of the average tensile strength of the untre
39、ated reference samples. The test is mandatory for all adhesives without regard to pH-value. 5.5 Effect of wood shrinkage on the shear strength When tested in accordance with 6.5 of this European Standard the average shear strength after climatic treatment shall not be lower than 1,5 N/mm2. 5.6 Stati
40、c load test of multiple bondline specimens in compression shear When tested in accordance with 6.6 of this European Standard, not more than one of the six samples are allowed to fail during the test period. The mean creep deformation of the glue lines in each of the remaining test samples shall not
41、exceed 0,05 mm after the test. BS EN 15425:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/07/2008 02:08, Uncontrolled Copy, (c) BSIEN 15425:2008 (E) 7 5.7 Creep deformation test at cyclic climate conditions with specimens loaded in bending shear When tested in accordance with 6.7 of t
42、his European Standard, the average ratio of the relative creep values of all five matched bending specimen pairs shall be evaluated after t = 26 weeks. () ()weeksiRCweeksRCmean26512651= meanRC : mean value of the ratio of relative creep of the five pairs of matched bending specimen iRC : ratio of re
43、lative creep of one matched pair of bending specimens, i meanRC (26 weeks) shall not be higher than 1,12. If the requirement is fulfilled, the test is completed. If a larger average ratio is obtained, the test may be continued for a second period of 26 weeks and a second assessment shall be performe
44、d after a total of 52 weeks under load. The average ratio of the relative creep value after 52 weeks, RCmean(52 weeks), shall not be larger than 1,15. The load must not be removed from the samples between the two test periods. 6 Test methods 6.1 General The following test methods shall be used for e
45、stablishing the requirements given in Clause 5 of this European Standard. 6.2 Determination of bond strength in longitudinal tensile shear strength Tests shall be made in accordance with EN 302-1 with glue line thickness 0,1 mm and 0,5 mm instead of 0,1 mm and 1,0 mm as stated in EN 302-1. Climatic
46、treatments shall be performed according to Annex A. Test samples subject to climatic treatment A6 and A7 shall be wrapped airtight before treatment to reduce moisture loss. The samples shall be tested immediately after removal from the climate chamber in a testing machine supplied with a temperature
47、-controlled chamber. 6.3 Determination of resistance to delamination Tests shall be made in accordance with EN 302-2. 6.4 Determination of tensile strength perpendicular to the bondline after climatic treatment The test shall be made in accordance with the principles described in EN 302-3, but with
48、samples made from untreated beech wood (Fagus sylvatica L.) with a density at (12 1) % moisture content of (700 50 kg/m). NOTE To ensure that no adhesive is lost from the test area, both sides of one of the two pieces of wood to be bonded together can be prepared with small wooden ledges made from b
49、eech wood as shown in Figure 1. The wooden ledges are glued on both sides of the wood with suitable equipment using a PVAC- adhesive. Care should be taken during the gluing of the ledges to avoid the PVAC- adhesive polluting the later glue line area. After curing of the PVAC-adhesive, the test pieces are bonded and produced as described in EN 302-3. BS EN 15425:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/07/2008 02:08, Uncontrolled Copy, (c) BSIEN 15425:2008 (E) 8 Dimensions in milli
