SIST EN 302-2:2017
(Main)Adhesives for load-bearing timber structures - Test methods - Part 2: Determination of resistance to delamination
Adhesives for load-bearing timber structures - Test methods - Part 2: Determination of resistance to delamination
This European Standard specifies a method for determining the resistance to delamination in glue lines.
It is suitable for the following applications:
a) for assessing the compliance of adhesives with EN 301, EN 15425 and EN 16254;
b) for assessing the suitability and quality of adhesives for load-bearing timber structures;
c) for comparing the effects on the bond strength resulting from the choice of bonding conditions, from different climatic conditioning and from the treatment of the test pieces before and after bonding.
This test is not applicable for modified and stabilized wood with strongly reduced swelling and shrinkage properties, such as acetylated wood, heat-treated wood and polymer impregnated wood.
This test is intended primarily to obtain performance data for the classification of adhesives for load-bearing timber structures according to their suitability for use in defined climatic environments.
This method is not intended to provide data for structural design, and does not necessarily represent the performance of the bonded member in service.
Klebstoffe für tragende Holzbauteile - Prüfverfahren - Teil 2: Bestimmung der Delaminierungsbeständigkeit
Diese Europäische Norm legt ein Verfahren zur Bestimmung der Beständigkeit von Klebstoffverbindungen gegen Delaminierung fest.
Sie ist für folgende Anwendungsfälle geeignet:
a) zur Beurteilung der Übereinstimmung von Klebstoffen mit EN 301, EN 15425 und EN 16254;
b) zur Beurteilung der Eignung und Qualität von Klebstoffen für tragende Holzbauteile;
c) zum Vergleich der Auswirkungen der gewählten Verklebungsbedingungen, von verschiedenen klimati¬schen Beanspruchungen und von der Behandlung der Prüfkörper vor und nach der Verklebung auf die Klebfestigkeit.
Diese Prüfung gilt nicht für modifiziertes und vergütetes Holz mit stark verringerten Quellungs- und Schwin-dungseigenschaften, wie beispielsweise acetyliertes Holz, wärmebehandeltes Holz und polymerimprägniertes Holz.
Diese Prüfung dient hauptsächlich der Bestimmung von Leistungswerten zur Klassifizierung von Klebstoffen für tragende Holzbauteile entsprechend ihrer Eignung zum Einsatz unter festgelegten klimatischen Bedin¬gungen.
Dieses Verfahren ist nicht dafür vorgesehen, Bemessungswerte bereitzustellen und gibt nicht zwangsläufig die Leistungsfähigkeit des verklebten Bauteiles im Gebrauch wieder.
Adhésifs pour structures portantes en bois - Méthodes d'essais - Partie 2 : Détermination de la résistance à la délaminage
La présente Norme européenne décrit une méthode de détermination de la résistance à la délamination des joints de colle.
Elle concerne les applications suivantes :
a) évaluation de la conformité des adhésifs à l’EN 301, à l’EN 15425 et à l’EN 16254 ;
b) évaluation de l’aptitude à l’emploi et de la qualité des adhésifs pour les structures portantes en bois ;
c) comparaison des effets sur la résistance à la rupture du joint en fonction du choix des conditions de collage, des divers conditionnements climatiques et du traitement des éprouvettes avant et après le collage.
Cet essai ne s'applique pas aux bois modifiés et stabilisés ayant des propriétés de retrait et de gonflement fortement réduites, tels que les bois acétylés, les bois traités thermiquement et les bois imprégnés de polymère.
Le présent essai est principalement destiné à obtenir des données de performances en vue de la classification des adhésifs pour les structures portantes en bois en fonction de leur aptitude à l'utilisation dans des environnements climatiques définis.
La présente méthode n'est pas destinée à fournir des données relatives au dimensionnement des structures et ne représente pas nécessairement les performances de l'élément collé dans son application.
Lepila za nosilne lesene konstrukcije - Preskusne metode - 2. del: Ugotavljanje odpornosti lepljenega stika proti razslojevanju (delaminaciji)
Ta evropski standard določa metodo za ugotavljanje odpornosti lepljenega stika proti razslojevanju (delaminaciji).
Metoda se uporablja:
a) za oceno skladnosti lepil s standardi EN 301, EN 15425 in EN 16254;
b) za oceno ustreznosti in kakovosti lepil za nosilne lesene konstrukcije;
c) za primerjavo vpliva na sprijemno trdnost, ki izhaja iz izbire pogojev lepljenja, različnih podnebnih danosti in obdelave preskusnih kosov pred lepljenjem in po njem.
Ta preskus se ne uporablja za obdelan in stabiliziran les, ki se bistveno manj nabreka in krči, kot so acetiliran les, toplotno obdelan les in polimerno impregniran les.
Ta preskus je namenjen zlasti pridobivanju podatkov o lastnostih za razvrstitev lepil za nosilne lesene konstrukcije glede na njihovo ustreznost za uporabo v opredeljenih podnebnih okoljih.
Ta metoda ni namenjena za zagotavljanje podatkov za konstrukcijsko zasnovo, pri čemer ne predstavlja nujno lastnosti zlepljenega elementa v uporabi.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lepila za nosilne lesene konstrukcije - Preskusne metode - 2. del: Ugotavljanje odpornosti lepljenega stika proti razslojevanju (delaminaciji)Klebstoffe für tragende Holzbauteile - Prüfverfahren - Teil 2: Bestimmung der DelaminierungsbeständigkeitAdhésifs pour structures portantes en bois - Méthodes d'essais - Partie 2 : Détermination de la résistance à la délaminageAdhesives for load-bearing timber structures - Test methods - Part 2: Determination of resistance to delamination91.080.20Lesene konstrukcijeTimber structures83.180LepilaAdhesivesICS:Ta slovenski standard je istoveten z:EN 302-2:2017SIST EN 302-2:2017en01-november-2017SIST EN 302-2:2017SLOVENSKI
STANDARDSIST EN 302-2:20131DGRPHãþD
SIST EN 302-2:2017
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 302-2
September
t r s y ICS
z uä s z r Supersedes EN
u r tæ tã t r s uEnglish Version
Adhesives for loadæbearing timber structures æ Test methods æ Part
tã Determination of resistance to delamination Adhésifs pour structures portantes en bois æ Méthodes d 5essais æ Partie
t ã Détermination de la résistance à la délamination
Klebstoffe für tragende Holzbauteile æ Prüfverfahren æ Teil
tã Bestimmung der DelaminierungsbeständigkeitThis European Standard was approved by CEN on
{ July
t r s yä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
9
t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
u r tæ tã t r s y ESIST EN 302-2:2017
EN 302-2:2017 (E) 2 Contents Page European foreword . 3 Introduction . 4 1 Scope . 6 2 Normative references . 6 3 Principle . 6 4 Apparatus . 6 5 Method . 7 5.1 Selection of timber . 7 5.2 Preparation of the bonded members . 7 5.2.1 Bonded members with thin glue lines . 7 5.2.2 Bonded members with 2 mm glue lines . 8 5.3 Preparation of test pieces . 9 5.3.1 Bonded members with thin glue lines . 9 5.3.2 Bonded members with 2 mm glue lines . 9 5.4 Test procedures . 9 5.4.1 General . 9 5.4.2 nulHigh temperature procedure (for type I adhesives) . 9 5.4.3 Low temperature procedure (for type II adhesives) . 10 5.5 Measurement and evaluation of delamination . 11 6 Expression of results . 12 7 Test report . 12 7.1 The adhesives . 12 7.2 Preparation of test pieces and testing procedure . 13 7.3 Test results . 13 Bibliography . 14
SIST EN 302-2:2017
EN 302-2:2017 (E) 3 European foreword This document (EN 302-2:2017) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of which is held by UNE. 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 March 2018, and conflicting national standards shall be withdrawn at the latest by March 2018. 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. This document supersedes EN 302-2:2013. Compared to EN 302-2:2013 the following modifications have been made: a) EN 15416-2 is replaced by EN 302-8, Adhesives for load-bearing timber structures — Test methods —Part 8: Static load test of multiple bond line specimens in compression shear; b) preparation of bonded members with 2 mm glue line thickness added as 5.2.2; c) preparation of test pieces with 2 mm glue line thickness added as 5.3.2; d) drying conditions for hardwood species included in 5.4.3. According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 302-2:2017
EN 302-2:2017 (E) 4 Introduction This document is one of a series dealing with adhesives for use with timber structures, and is published in support of EN, 1995 Eurocode 5: Design of timber structures. The series consists of three classification and performance requirements for adhesives for load-bearing timber structures, phenolic and aminoplastic adhesives (EN 301), one component polyurethane adhesives (EN 15425) and emulsion polymerised isocyanate adhesives (EN 16254), and all together twelve test methods (EN 302-1, EN 302-2, EN 302-3, EN 302-4, EN 302-5, EN 302-6, EN 302-7 and EN 302-8 and EN 15416-1, EN 15416-3, EN 15416-4 and EN 15416-5). These European Standards have the following titles: EN 301, Adhesives, phenolic and aminoplastic, for load-bearing timber structures — Classification and performance requirements EN 15425, Adhesives — One component polyurethane (PUR) for load bearing timber structures — Classification and performance requirements EN 16254, Adhesives — Emulsion polymerized isocyanate (EPI), for load-bearing timber structures — Classification and performance requirements EN 302, Adhesives for load-bearing timber structures — Test methods — Part 1: Determination of longitudinal tensile shear strength — Part 2: Determination of resistance to delamination — Part 3: Determination of the effect of acid damage to wood fibres by temperature and humidity cycling on the transverse tensile strength — Part 4: Determination of the effects of wood shrinkage on the shear strength — Part 5: Determination of maximum assembly time under referenced conditions — Part 6: Determination of the minimum pressing time under referenced conditions — Part 7: Determination of the working life under referenced conditions — Part 8: Static load test of multiple bond line specimens in compression shear EN 15416, Adhesives for load bearing timber structures other than phenolic and aminoplastic — Test methods — Part 1: Long-term tension load test perpendicular to the bond line at varying climate conditions with specimens loaded perpendicular to the glue line (Glasshouse test) — Part 3: Creep deformation test at cyclic climate conditions with specimens loaded in bending shear — Part 4: Determination of open assembly time under referenced conditions — Part 5: Determination of minimum pressing time under referenced conditions. SIST EN 302-2:2017
EN 302-2:2017 (E) 5 Safety statement Persons using this document should be familiar with the normal laboratory practice, if applicable. This document cannot 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. Environmental statement It is understood that some of the material permitted in this standard can have a negative environmental impact. As technological advantages lead to better alternatives for these materials, they will be eliminated from this standard to the greatest extent possible. At the end of the test, it is recommended that the user of the standard take care to carry out an appropriate disposal of the wastes, according to local regulations. SIST EN 302-2:2017
EN 302-2:2017 (E) 6 1 Scope This European Standard specifies a method for determining the resistance to delamination in glue lines. It is suitable for the following applications: a) for assessing the compliance of adhesives with EN 301, EN 15425 and EN 16254; b) for assessing the suitability and quality of adhesives for load-bearing timber structures; c) for comparing the effects on the bond strength resulting from the choice of bonding conditions, from different climatic conditioning and from the treatment of the test pieces before and after bonding. This test is not applicable for modified and stabilized wood with strongly reduced swelling and shrinkage properties, such as acetylated wood, heat-treated wood and polymer impregnated wood. This test is intended primarily to obtain performance data for the classification of adhesives for load-bearing timber structures according to their suitability for use in defined climatic environments. This method is not intended to provide data for structural design, and does not necessarily represent the performance of the bonded member in service. 2 Normative references Not applicable. 3 Principle Bonded, laminated specimens are subjected to an impregnation-drying procedure. The specimens are impregnated with water by immersing them and applying alternating high and low (vacuum) pressure. They are then dried rapidly in a specified air stream at low humidity (see 4.4). The extent of open glue lines, delamination, as a result of these treatments is measured and compared with the total length of glue lines on both end-grain faces of the specimen. 4 Apparatus 4.1 Autoclave or similar pressure vessel, designed to safely withstand a pressure of at least 625 kPa absolute (525 kPa above nominal atmospheric pressure). 4.2 Vacuum pump or similar device, capable of reducing the pressure in the vessel (4.1) to below 20 kPa absolute (80 kPa below nominal atmospheric pressure). 4.3 Pump or similar device, for obtaining a pressure of at least 600 kPa absolute (500 kPa above nominal atmospheric pressure). 4.4 Air-circulating oven(s) or chamber(s), capable of drying the test pieces (see 5.4) in the following climate condition: a) for low temperature procedure (type II adhesive) a temperature of (27,5 ± 2,5) °C, circulating the air within the chamber, maintaining a constant relative humidity of (30 ± 5) % and b) for high temperature procedure (type I adhesive) a temperature of (65 ± 3) °C, circulating the air within the chamber, maintaining a relative humidity of (12,5 ± 2,5) %. SIST EN 302-2:2017
EN 302-2:2017 (E) 7 NOTE Air speed velocity of 2 m/s to 3 m/s in empty chamber has shown to be suitable to achieve drying times according to 5.4.2 and 5.4.3. 4.5 Balance, allowing measurements with an accuracy of ± 1 g. 4.6 Wood chisel and hammer, or similar devices capable of opening the glue lines. 5 Method 5.1 Selection of timber Use flat-sawn, straight-grained Norway spruce (Picea abies L.), free of reaction wood, with a density of (450 ± 25) kg/3m at (12 ± 1) % moisture content. Preferably, knot-free wood should be used, but allowances are made for boards with knots up to a maximum of 20 mm in diameter, but splay (spike) knot is not allowed. The test with Norway spruce also covers approval of silver fir (Abies alba) and Scots pine (Pinus sylvestris). If the adhesive is to be used on wood from other conifer species like larch (Larix decidua), Douglas fir (Pseudotsuga menziesii) and pines with coloured heartwood (other than Scots pine (Pinus sylvestris)), from hardwood species and/or on preservative treated wood, also prepare four laminated members using representative samples using wood with mean density. Condition the timber in the standard climate [20/65] ((20 ± 2) °C and a relative humidity of (65 ± 5) %) for at least 7 days prior to bonding, ensuring that the timber has a moisture content of (12 ± 1) %. 5.2 Preparation of the bonded members 5.2.1 Bonded members with thin glue lines Make four laminated members, two with short assembly time and two with long assembly time. For each laminated member, pre
...
SLOVENSKI STANDARD
oSIST prEN 302-2:2015
01-september-2015
Lepila za nosilne lesene konstrukcije - Preskusne metode - 2. del: Ugotavljanje
odpornosti lepljenega stika proti razslojevanju (delaminaciji)
Adhesives for load-bearing timber structures - Test methods - Part 2: Determination of
resistance to delamination
Klebstoffe für tragende Holzbauteile - Prüfverfahren - Teil 2: Bestimmung der
Delaminierungsbeständigkeit
Adhésifs pour structures portantes en bois - Méthodes d'essais - Partie 2 : Détermination
de la résistance à la délaminage
Ta slovenski standard je istoveten z: prEN 302-2 rev
ICS:
83.180 Lepila Adhesives
91.080.20 Lesene konstrukcije Timber structures
oSIST prEN 302-2:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 302-2:2015
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oSIST prEN 302-2:2015
EUROPEAN STANDARD
DRAFT
prEN 302-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2015
ICS 83.180 Will supersede EN 302-2:2013
English Version
Adhesives for load-bearing timber structures - Test methods -
Part 2: Determination of resistance to delamination
Adhésifs pour structures portantes en bois - Méthodes Klebstoffe für tragende Holzbauteile - Prüfverfahren - Teil 2:
d'essais - Partie 2 : Détermination de la résistance à la Bestimmung der Delaminierungsbeständigkeit
délaminage
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 193.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 302-2:2015 E
worldwide for CEN national Members.
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oSIST prEN 302-2:2015
prEN 302-2:2015 (E)
Contents Page
Foreword .3
Introduction .4
1 Scope .6
2 Normative references .6
3 Principle .6
4 Apparatus .6
5 Method .7
5.1 Selection of timber.7
5.2 Preparation of the bonded members .7
5.2.1 Bonded members with thin gluelines .7
5.2.2 Bonded members with 2 mm gluelines .8
5.3 Preparation of test pieces .9
5.3.1 Bonded members with thin gluelines .9
5.3.2 Bonded members with 2 mm gluelines .9
5.4 Test procedures .9
5.4.1 General .9
5.4.2 High temperature procedure (for type I adhesives) .9
5.4.3 Low temperature procedure (for type II adhesives) . 10
5.5 Measurement and evaluation of delamination . 11
6 Expression of results . 12
7 Test report . 12
7.1 The adhesives . 12
7.2 Preparation of test pieces and testing procedure . 12
7.3 Test results . 13
Bibliography . 14
2
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oSIST prEN 302-2:2015
prEN 302-2:2015 (E)
Foreword
This document (FprEN 302-2:2015) has been prepared by Technical Committee CEN/TC 193 “Adhesives”,
the secretariat of which is held by AENOR.
This document is currently submitted to the CEN enquiry.
This document will supersede EN 302-2:2013.
Compared to EN 302-2:2013 the following modifications have been made:
a) preparation of bonded members with 2 mm glueline thickness added as 5.2.2;
b) preparation of test pieces with 2 mm glueline thickness added as 5.3.2.
3
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oSIST prEN 302-2:2015
prEN 302-2:2015 (E)
Introduction
This document is one of a series dealing with adhesives for use with timber structures, and is published in
support of EN, 1995 Eurocode 5: Design of timber structures. The series consists of three classification and
performance requirements for adhesives for load-bearing timber structures, phenolic and aminoplastic
adhesives (EN 301), one component polyurethane adhesives (EN 15425) and emulsion polymerised
isocyanate adhesives (EN 16254), and all together eleven test methods (EN 302-1, EN 302-2, EN 302-3,
EN 302-4, EN 302-5, EN 302-6 and EN 302-7 and EN 15416-2, EN 15416-3, EN 15416-4 and EN 15416-5).
These European Standards have the following titles:
EN 301, Adhesives, phenolic and aminoplastic, for load-bearing timber structures — Classification and
performance requirements
EN 15425, Adhesives — One component polyurethane for load bearing timber structures ― Classification and
performance requirements
EN 16254, Adhesives — Emulsion polymerized isocyanate (EPI), for load-bearing timber structures ―
Classification and performance requirements
EN 302, Adhesives for load-bearing timber structures — Test methods
— Part 1: Determination of longitudinal tensile shear strength
— Part 2: Determination of resistance to delamination
— Part 3: Determination of the effect of acid damage to wood fibres by temperature and humidity cycling on
the transverse tensile strength
— Part 4: Determination of the effects of wood shrinkage on the shear strength
— Part 5: Determination of maximum assembly time under referenced conditions
— Part 6: Determination of the minimum pressing time under referenced conditions
— Part 7: Determination of the working life under referenced conditions
EN 15416, 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
— Part 3: Creep deformation test at cyclic climate conditions with specimens loaded in bending shear
— Part 4: Determination of open assembly time for one component polyurethane adhesives
— Part 5: Determination of conventional pressing time
Safety statement
Persons using this document should be familiar with the normal laboratory practice, if applicable. This
document cannot 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.
4
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oSIST prEN 302-2:2015
prEN 302-2:2015 (E)
Environmental statement
It is understood that some of the material permitted in this standard can have a negative environmental
impact. As technological advantages lead to better alternatives for these materials, they will be eliminated
from this standard to the greatest extent possible.
At the end of the test, it is recommended that the user of the standard take care to carry out an appropriate
disposal of the wastes, according to local regulations.
5
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oSIST prEN 302-2:2015
prEN 302-2:2015 (E)
1 Scope
This European Standard specifies a method for determining the resistance to delamination in glue lines.
It is suitable for the following applications:
a) for assessing the compliance of adhesives with EN 301, EN 15425 and EN 16254;
b) for assessing the suitability and quality of adhesives for load-bearing timber structures;
c) for comparing the effects on the bond strength resulting from the choice of bonding conditions, from
different climatic conditioning and from the treatment of the test pieces before and after bonding.
This test is not applicable for modified and stabilized wood with strongly reduced swelling and shrinkage
properties, such as acetylated wood, heat-treated wood and polymer impregnated wood.
This test is intended primarily to obtain performance data for the classification of adhesives for load-bearing
timber structures according to their suitability for use in defined climatic environments.
This method is not intended to provide data for structural design, and does not necessarily represent the
performance of the bonded member in service.
2 Normative references
Not applicable.
3 Principle
Bonded, laminated specimens are subjected to an impregnation-drying procedure. The specimens are
impregnated with water by immersing them and applying alternating high and low (vacuum) pressure. They
are then dried rapidly in a specified air stream at low humidity (see 4.4). The extent of open glue lines,
delamination, as a result of these treatments is measured and compared with the total length of glue lines on
both end-grain faces of the specimen.
4 Apparatus
4.1 Autoclave or similar pressure vessel, designed to safely withstand a pressure of at least 625 kPa
absolute (525 kPa above nominal atmospheric pressure).
4.2 Vacuum pump or similar device, capable of reducing the pressure in the vessel (4.1) to below 20 kPa
absolute (80 kPa below nominal atmospheric pressure).
4.3 Pump or similar device, for obtaining a pressure of at least 600 kPa absolute (500 kPa above nominal
atmospheric pressure).
4.4 Air-circulating oven(s) or chamber(s), capable of drying the test pieces (see 5.4) in the following
climate condition:
a) for low temperature procedure (type II adhesive) a temperature of (27,5 ± 2,5) °C, circulating the air within
the chamber, maintaining a constant relative humidity of (30 ± 5) %; and
6
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oSIST prEN 302-2:2015
prEN 302-2:2015 (E)
b) for high temperature procedure (type I adhesive) a temperature of (65 ± 3) °C, circulating the air within
the chamber, maintaining a relative humidity of (12,5 ± 2,5) %.
NOTE Air speed velocity of 2 m/s to 3 m/s in empty chamber has shown to be suitable to achieve drying times
according to 5.4.2 and 5.4.3.
4.5 Balance, allowing measurements with an accuracy of ± 1 g.
4.6 Wood chisel and hammer, or similar devices capable of opening the glue lines.
5 Method
5.1 Selection of timber
Use flat-sawn, straight-grained Norway spruce (Picea abies L.), free of reaction wood, with a density of
3
(450 ± 25) kg/m at (12 ± 1) % moisture content. Preferably, knot-free wood should be used, but allowances
are made for boards with knots up to a maximum of 20 mm in diameter, but splay (spike) knot is not allowed.
The test with Norway spruce also covers approval of silver fir (Abies alba) and Scots pine (Pinus sylvestris).
If the adhesive is to be used on wood from other conifer species like larch (Larix decidua), Douglas fir
(Pseudotsuga menziesii) and pines with coloured heartwood (other than Scots pine (Pinus sylvestris)), from
hardwood species and/or on preservative treated wood, also prepare four laminated members using
representative samples using wood with mean density.
Condition the timber in the standard climate [20/65] ((20 ± 2) °C and a relative humidity of (65 ± 5) %) for at
least 7 days prior to bonding, ensuring that the timber has a moisture content of (12 ± 1) %.
5.2 Preparation of the bonded members
5.2.1 Bonded members with thin gluelines
Make four laminated members, two with short assembly time and two with long assembly time. For each
laminated member, prepare six lamellae at least (150 ± 5) mm wide, (30 ± 1) mm thick and
...
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