1、BSI Standards PublicationBS EN 16254:2013Adhesives Emulsionpolymerized isocyanate(EPI) for load-bearing timberstructures Classification andperformance requirementsCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permit
2、ted without license from IHS-,-,-BS EN 16254:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 16254:2013.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/52, Adhesives.A list of organizations represented on this committee can b
3、eobtained 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 74151 7ICS 83.180Compliance wit
4、h a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 October 2013.Amendments issued since publicationDate Text affectedCopyright European Committee for Standardization Provided by
5、 IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16254:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 16254 October 2013 ICS 83.180 English Version Adhesives - Emulsion polymerized isocyanate (EPI) for load-bearing timber s
6、tructures - Classification and performance requirements Adhsifs - Isocyanate polymris en mulsion (EPI) pour structures portantes en bois - Classification et exigences de performance Klebstoffe - Emulsionspolymerisiertes Isocyanat (EPI) fr tragende Holzbauteile - Klassifizierung und Leistungsanforder
7、ungen This European Standard was approved by CEN on 22 June 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical
8、references concerning such national standards may be obtained on application to the CEN-CENELEC 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 translation under the responsibility of
9、a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Mace
10、donia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUR
11、OPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16254:2013: ECopyright European Committee for Standardization Provided by IHS under l
12、icense with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16254:2013EN 16254:2013 (E) 2 Contents Page Foreword . 3 Introduction 4 1 Scope 5 2 Normative references . 5 3 Terms and definitions 6 4 Classification 7 5 Requirements . 9 5.1 General . 9 5.2 Bon
13、d strength in longitudinal tensile shear test 9 5.3 Resistance to delamination . 10 5.4 Tensile strength perpendicular to the glue line after climatic treatment (acid damage test) . 11 5.5 Effect of wood shrinkage on the shear strength 11 5.6 Static load test of multiple glue line specimens in compr
14、ession shear 11 5.7 Creep deformation test at cyclic climate conditions with specimens loaded in bending shear . 12 5.8 Long term sustained load test at cyclic climate conditions with specimens loaded perpendicular to the glue line (“Glass house test”) . 12 6 Test methods 12 6.1 General . 12 6.2 Det
15、ermination of bond strength in longitudinal tensile shear test 12 6.3 Determination of resistance to delamination 12 6.4 Determination of tensile strength perpendicular to the glue line after climatic treatment (acid damaged test) 12 6.5 Determination of the effect of wood shrinkage on the shear str
16、ength 13 6.6 Static load test of multiple glue line specimens in compression shear 13 6.7 Creep deformation test with specimens loaded in bending shear. 14 6.8 Long term sustained load test at cyclic climate conditions with specimens loaded perpendicular to the glue line (“Glass house test”) . 14 7
17、Working properties of the adhesive 14 7.1 General . 14 7.2 Determination of working life under reference conditions . 14 7.3 Determination of open assembly time under reference conditions . 14 7.4 Determination of pressing time under reference conditions . 14 Annex A (normative) Climatic treatment p
18、rior to shear test . 15 Annex B (normative) Glass house test 16 Annex C (informative) Product limitations and glulam production control for beams produced with Small Dimension adhesives . 19 Bibliography 20 Copyright European Committee for Standardization Provided by IHS under license with CENNot fo
19、r ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16254:2013EN 16254:2013 (E) 3 Foreword This document (EN 16254:2013) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of which is held by AENOR. This European Standard shall be given th
20、e status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2014, and conflicting national standards shall be withdrawn at the latest by April 2014. Attention is drawn to the possibility that some of the elements of this document may be the s
21、ubject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium,
22、 Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerlan
23、d, Turkey and the United Kingdom. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16254:2013EN 16254:2013 (E) 4 Introduction This document is one of a series dealing with e
24、mulsion polymerised isocyanate (EPI) adhesives for use with timber structures, and is published in support of product standards for bonded load-bearing timber structures. The series consists of: one standard for classification and performance requirements (EN 16254), seven test methods (EN 302-1, EN
25、 302-2, EN 302-3, EN 302-4, EN 15416-2, EN 15416-3 and the method given in Annex B of this standard (“Glass house”) used to assess the performance of adhesives after specified heat and humidity treatments, and three test methods (EN 302-7, EN 15416-4 and EN 15416-5) to characterise the working prope
26、rties of the adhesive. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16254:2013EN 16254:2013 (E) 5 1 Scope This European Standard establishes a classification for emulsio
27、n polymerised isocyanate (EPI) adhesives according to their suitability for use in load-bearing timber structures in defined climatic exposure conditions, and specifies performance requirements for such adhesives for the industrial manufacture of load-bearing timber structures only. The performance
28、requirements of this standard apply to the adhesive only, not to the structure. 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 sp
29、ecifies the performance of an adhesive for use in 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 ac
30、cording to an appropriate product standard. 2 Normative references The 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, the latest edition of
31、the referenced document (including any amendments) applies. EN 302-1, Adhesives for load-bearing timber structures Test methods Part 1: Determination of longitudinal tensile shear strength EN 302-2, Adhesives for load-bearing timber structures Test methods Part 2: Determination of resistance to dela
32、mination EN 302-3, Adhesives for load-bearing timber structures 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: Determinat
33、ion of the effects of wood shrinkage on the shear strength EN 302-7, Adhesives for load-bearing timber structures Test methods Part 7: Determination of the working life under referenced conditions EN 923:2005+A1:2008, Adhesives Terms and definitions EN 15416-2, Adhesives for load bearing timber stru
34、ctures other than phenolic and aminoplastic Test methods Part 2: Static load test of multiple 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
35、 with specimens loaded in bending shear EN 15416-4, Adhesives for load bearing timber 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
36、phenolic and aminoplastic Test methods Part 5: Determination of conventional pressing time Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16254:2013EN 16254:2013 (E) 6 3 T
37、erms and definitions For the purposes of this document, the terms and definitions given in EN 923:2005+A1:2008, and the following, apply. 3.1 emulsion polymerised isocyanate (EPI) adhesive water based emulsion polymer or a mixture of water based emulsion polymers cross-linked with an isocyanate as h
38、ardener 3.2 service class 1 climatic conditions characterised by a moisture content in the materials corresponding to a temperature of 20 C and the relative humidity of the surrounding air only exceeding 65 % for a few weeks per year SOURCE: EN 1995-1-1:2004, 2.3.1.3 Note 1 to entry: In service clas
39、s 1, which comprises typical indoor conditions, the average moisture content in most soft-woods will not exceed 12 %. 3.3 service class 2 climatic conditions characterised by a moisture content in the materials corresponding to a temperature of 20 C and the relative humidity of the surrounding air o
40、nly exceeding 85 % for a few weeks per year SOURCE: EN 1995-1-1:2004, 2.3.1.3 Note 1 to entry: In service class 2, to which most covered exterior conditions belong, the average moisture content in most soft-woods will not exceed 20 %. 3.4 service class 3 climatic conditions leading to higher moistur
41、e contents than in service class 2 SOURCE: EN 1995-1-1:2004, 2.3.1.3 Note 1 to entry: Exterior conditions typically belong to service class 3. 3.5 glue line adhesive layer between the wood members 3.6 close contact glue line (cc) glue line of thickness maximum 0,1 mm Note 1 to entry: Close contact g
42、lue line is achieved by pressing together two plane wood members with a clamping pressure of (0,8 0,1) N/mm2without groves, spacers or similar device. 3.7 thick glue line glue line of nominal thickness 0,3 mm to 2,0 mm Note 1 to entry: Thick glue lines can be achieved by using spacers, grooves or si
43、milar devices. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16254:2013EN 16254:2013 (E) 7 4 Classification Adhesives for structural purpose shall produce joints of such
44、strength and durability that the integrity of the bond is maintained in the assigned service class throughout the expected life of the structure. EPI-adhesives according to EN 16254 are classified by Type (climate condition in use), Maximum test temperature and Maximum glue line thickness in use. Th
45、ese three subclasses are subdivided as follows: Type I: To be used in service class 1 and 2. Type II: To be used in service class 1 only. Maximum test temperature: 50 C, 70 C or 90 C. Maximum glue line thickness in use: 0,1 mm, 0,2 mm and 0,3 mm. Depending on the maximum glue line thickness in use,
46、the adhesives are assigned to different application areas as described below and shown in Table 1. General purpose adhesives: to be used for glue lines between laminations (maximum glue line thickness 0,3 mm) and for finger joints in laminations. Small dimension adhesives: to be used in beams with a
47、 maximum cross section 45 000 mm2(maximum glue line thickness 0,2 mm) and for finger joints in laminations. The beam width shall not exceed 180 mm and the beam height shall not exceed 300 mm. Finger jointing adhesives: to be used for finger jointing of laminations and structural timber only (maximum
48、 glue line thickness 0,1 mm). The application of EPI shall always be in mixed state. These adhesives shall be applied according to the manufacturers instructions. NOTE The definition of General purpose and Type could be different in other standards. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16254:2013EN 16254:2013 (E) 8 Table 1 Adhesive classes Adhesive type designation Application area Max. test temperature aCMax
