SIST EN 16254:2014

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lepila - Emulzijsko polimerizirani izocianat (EPI) za nosilne lesene konstrukcije - Razvrstitev in zahtevane lastnostiKlebstoffe - Emulsionspolymerisiertes Isocyanat (EPI) für tragende Holzbauteile - Klassifizierung und LeistungsanforderungenAdhésifs - Isocyanate polymérisé en émulsion (EPI) pour structures portantes en bois - Classification et exigences de performanceAdhesives - Emulsion polymerized isocyanate (EPI) for load-bearing timber structures - Classification and performance requirements91.080.20Lesene konstrukcijeTimber structures83.180LepilaAdhesivesICS:Ta slovenski standard je istoveten z:EN 16254:2013SIST EN 16254:2014en,fr,de01-april-2014SIST EN 16254:2014SLOVENSKI
STANDARD



SIST EN 16254:2014



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16254
October 2013 ICS 83.180 English Version
Adhesives - Emulsion polymerized isocyanate (EPI) for load-bearing timber structures - Classification and performance requirements
Adhésifs - Isocyanate polymérisé en émulsion (EPI) pour structures portantes en bois - Classification et exigences de performance
Klebstoffe - Emulsionspolymerisiertes Isocyanat (EPI) für tragende Holzbauteile - Klassifizierung und Leistungsanforderungen 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 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 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 Macedonia, 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.
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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: ESIST EN 16254:2014



EN 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 Bond 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 compression 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 Determination 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 strength . 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 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 prior 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
SIST EN 16254:2014



EN 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 the 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 subject 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, 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, Switzerland, Turkey and the United Kingdom. SIST EN 16254:2014



EN 16254:2013 (E) 4 Introduction This document is one of a series dealing with emulsion 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 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 properties of the adhesive. SIST EN 16254:2014



EN 16254:2013 (E) 5 1 Scope This European Standard establishes a classification for emulsion 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 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 specifies 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 according 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 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 delamination 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: Determination 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 structures 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 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 phenolic and aminoplastic — Test methods — Part 5: Determination of conventional pressing time SIST EN 16254:2014



EN 16254:2013 (E) 6 3 Terms 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 hardener 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 class 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 only 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 moisture 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 glue line is achieved by pressing together two plane wood members with a clamping pressure of (0,8 ± 0,1) N/mm2 without 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 similar devices. SIST EN 16254:2014



EN 16254:2013 (E) 7 4 Classification Adhesives for structural purpose 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. EPI-adhesives according to EN 16254 are classified by Type (climate condition in use), Maximum test temperature and Maximum glue line thickness in use. These 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, 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 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 glue line thickness 0,1 mm). The application of EPI shall always be in mixed state. These adhesives shall be applied according to the manufacturer`s instructions. NOTE
The definition of General purpose and Type could be different in other standards. SIST EN 16254:2014



EN 16254:2013 (E) 8 Table 1 — Adhesive classes Adhesive type designation Application area Max. test temperature a °C Max. glue line thickness mm Service classes EN 16254 I 70 0,3 Normal use General purpose 70 Test 0,5 Use 0,3 1, 2
Special use
EN 16254 I 90 0,3 EN 16254 I 90 0,2 EN 16254 I 90 0,1 EN 16254 I 70 0,2 EN 16254 I 70 0,1 EN 16254 II 50 0,3 EN 16254 II 50 0,2 EN 16254 II 50 0,1 General purpose Small dimension Finger jointing Small dimension Finger jointing General purpose Small dimension Finger jointing 90 90 90 70 70 50 50 50 0,5 0,3 0,3 0,3 0,3 0,5 0,3 0,3 0,3 0,2 0,1 0,2 0,1 0,3 0,2 0,1 1, 2 1, 2 1, 2 1, 2 1, 2 1 1 1 a Tested according to EN 15416–2 and Annex A in this standard, designation A6, A7 and A8.
Table 2 specifies the tests which shall be performed for each application area. References are given to the actual subclause in this standard and to which standard the tests are based on. Table 2 — Necessary tests for adhesive use in difference application areas Application area Glue line thickness in test mm EN 302–1 (based on 6.2)a
EN 302–2 (based on 6.3) EN 302–3 (based on 6.4) EN 302–4 (based on 6.5) EN 15416–2 (based on 6.6)b EN 15416–3 (based on 6.7) Annex B in this standard (based on 6.8) General Purpose 0,1 X X
X
X 0,3
X
0,5 X
X X
X Small dimension 0,1 X X
X
X 0,2
X
0,3 X
X X
X Finger jointing 0,1 X X X
X X X 0,3 X
a Climate treatment A1 to A5 and A6 or A7 or A8, depending on maximum test temperature (see Table 1 and Annex A). b Maximum test temperature according to Table 1. SIST EN 16254:2014



EN 16254:2013 (E) 9 5 Requirements 5.1 General Adhesives complying with this European Standard shall meet the performance requirements specified in 5.2 to 5.8 when tested in accordance with the following test methods: a) The tensile shear test (see 5.2 and 6.2) using bonded test pieces made from beech (Fagu
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