SIST EN 301:2023
(Main)Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification and performance requirements
Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification and performance requirements
This document establishes a classification for phenolic and aminoplastic polycondensation adhesives according to their suitability for use for load-bearing timber structures in defined climatic exposure conditions, and specifies performance requirements for such adhesives for the factory manufacture or factory-like manufacturing conditions of load-bearing timber structures only.
This document only specifies the performance of an adhesive for use in an environment corresponding to the defined conditions.
The performance requirements of this document apply to the adhesive only, not to the timber structure. This document does not cover the performance of adhesives for on-site gluing (except for factory-like conditions) nor the production of wood-based panels, except solid wood panels, or modified and stabilized wood with considerably reduced swelling and shrinkage properties, e.g. such as acetylated wood, heat treated wood and polymer impregnated wood.
This document 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. The requirements apply to the type testing of the adhesives. Production control activities are outside the scope of this document.
Adhesives meeting the requirements of this document are adequate for use in a load-bearing timber structures, provided that the bonding process has been carried out according to an appropriate product standard.
Klebstoffe, Phenoplaste und Aminoplaste, für tragende Holzbauteile - Klassifizierung und Leistungsanforderungen
Dieses Dokument stellt eine Klassifizierung für Polykondensationsklebstoffe auf Phenoplast- und Aminoplastbasis entsprechend ihrer Eignung zur Verwendung für tragende Holzbauteile unter bestimmten Klimabedingungen auf und legt die Leistungsanforderungen an derartige Klebstoffe ausschließlich zur werksmäßigen Herstellung oder Herstellung unter werksähnlichen Bedingungen von tragenden Holzbauteilen fest.
Dieses Dokument legt nur das Leistungsverhalten eines Klebstoffs für den Einsatz in einer Umgebung fest, die den festgelegten Bedingungen entspricht.
Die Leistungsanforderungen in diesem Dokument sind lediglich für den Klebstoff, nicht für das Holzbauteil anzuwenden. Dieses Dokument behandelt weder das Leistungsverhalten von Klebstoffen für die Vor-Ort-Verklebung (ausgenommen bei werksähnlichen Bedingungen) noch die Produktion von Holzwerkstoffen, ausgenommen Massivholzplatten. Es ist nicht für modifiziertes und vergütetes Holz mit beträchtlich verringerten Quellungs- und Schwindungseigenschaften anzuwenden, wie z. B. acetyliertes Holz, wärmebehandeltes Holz und mit Kunstharz imprägniertes Holz.
Dieses Dokument ist in erster Linie für den Gebrauch durch die Hersteller der Klebstoffe und der verklebten Holzbauteile bestimmt, um die Qualität von Klebstoffen zu beurteilen oder zu überprüfen. Die Anforderungen sind für die Typprüfung von Klebstoffen anzuwenden. Aktivitäten im Rahmen der Produktionskontrolle gehören nicht zum Anwendungsbereich dieses Dokuments.
Klebstoffe, die die Anforderungen dieses Dokuments erfüllen, sind für den Einsatz in tragenden Holzbauteilen geeignet, vorausgesetzt, dass der Verklebungsvorgang nach einer entsprechenden Produktnorm vorgenommen wurde.
Adhésifs de nature phénolique et aminoplaste, pour structures portantes en bois - Classification et exigences de performance
Le présent document établit une classification des adhésifs de polycondensation de type phénolique ou aminoplaste en fonction de leur aptitude à l’emploi dans les structures portantes en bois dans des conditions d’exposition climatique définies, et spécifie les exigences de performance applicables à ces adhésifs uniquement lorsqu’ils sont utilisés pour la fabrication en usine de structures portantes en bois, ou dans des conditions semblables à la fabrication en usine.
Le présent document spécifie la performance d’un adhésif uniquement dans l’environnement correspondant aux conditions définies.
Les exigences relatives à la performance définies dans le présent document ne s’appliquent qu’aux adhésifs et non aux produits manufacturés en bois. Le présent document ne couvre pas la performance des adhésifs utilisés pour le collage sur site (à l’exception des conditions semblables à la fabrication en usine) ou pour la fabrication de panneaux à base de bois, à l’exception des panneaux en bois massif, ou pour le bois modifié et stabilisé ayant une propension considérablement réduite au gonflement et au retrait, comme par exemple le bois acétylé, le bois traité à la chaleur et le bois imprégné de polymère.
Le présent document s’adresse avant tout aux fabricants d’adhésifs pour leur permettre, dans le domaine des produits en bois collés, d’évaluer ou de contrôler la qualité des adhésifs. Les exigences s’appliquent aux essais de type des adhésifs. Les activités de contrôle de la production ne relèvent pas du domaine d’application du présent document.
Les adhésifs répondant aux exigences du présent document conviennent pour une utilisation dans des structures portantes en bois, à condition que le processus de collage ait été réalisé conformément à une norme de produit appropriée.
Lepila na osnovi fenolov in aminoplastov za nosilne lesene konstrukcije - Razvrstitev in zahteve za delovanje
Ta dokument določa razvrstitev za fenolna in aminoplastična lepila v skladu z njihovo primernostjo za uporabo pri nosilnih lesenih konstrukcijah pri določenih pogojih izpostavljenosti podnebnim razmeram ter določa zahtevane lastnosti za taka lepila za tovarniško proizvodnjo ali tovarni podobne proizvodne pogoje za izključno nosilne lesene konstrukcije.
Ta dokument določa lastnosti lepila izključno za uporabo v okolju, ki ustreza podanim pogojem.
Zahteve glede učinkovitosti v tem dokumentu se uporabljajo samo za lepila, ne za lesene konstrukcije. Ta dokument ne zajema lastnosti lepil za lepljenje na mestu uporabe (razen v pogojih, podobnih tovarniškim) niti proizvodnje lesnih plošč, razen polnih lesnih plošč, ali obdelanega in stabiliziranega lesa, ki bistveno manj nabreka in se krči, kot so acetiliran les, toplotno obdelan les in polimerno impregniran les.
Ta dokument je namenjen predvsem za proizvajalce lepil in za uporabo pri lesenih konstrukcijah, vezanih z lepili, za ocenjevanje ali nadzor kakovosti lepil. Zahteve se uporabljajo za tipsko preskušanje lepil. Dejavnosti kontrole proizvodnje ne spadajo na področje uporabe tega dokumenta.
Lepila, ki izpolnjujejo zahteve tega dokumenta, so primerna za uporabo pri nosilnih lesenih konstrukcijah pod pogojem, da je bil postopek vezave izveden v skladu z ustreznim standardom za proizvod.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 301:2023
01-april-2023
Lepila na osnovi fenolov in aminoplastov za nosilne lesene konstrukcije -
Razvrstitev in zahteve za delovanje
Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification
and performance requirements
Klebstoffe, Phenoplaste und Aminoplaste, für tragende Holzbauteile - Klassifizierung und
Leistungsanforderungen
Adhésifs de nature phénolique et aminoplaste, pour structures portantes en bois -
Classification et exigences de performance
Ta slovenski standard je istoveten z: EN 301:2023
ICS:
83.180 Lepila Adhesives
91.080.20 Lesene konstrukcije Timber structures
SIST EN 301:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 301:2023
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SIST EN 301:2023
EN 301
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2023
EUROPÄISCHE NORM
ICS 83.180 Supersedes EN 301:2017
English Version
Adhesives, phenolic and aminoplastic, for load-bearing
timber structures - Classification and performance
requirements
Adhésifs de nature phénolique et aminoplaste, pour Klebstoffe, Phenoplaste und Aminoplaste, für tragende
structures portantes en bois - Classification et Holzbauteile - Klassifizierung und
exigences de performance Leistungsanforderungen
This European Standard was approved by CEN on 18 December 2022.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 301:2023 E
worldwide for CEN national Members.
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SIST EN 301:2023
EN 301:2023 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Classification. 7
5 Requirements . 10
5.1 General. 10
5.2 Tensile shear test . 11
5.3 Delamination test . 12
5.4 Fibre damage test . 13
5.5 Shrinkage test . 13
5.6 Static load test . 13
5.7 Type testing of separate application finger joint adhesive . 14
6 Working properties of the adhesive . 14
6.1 General. 14
6.2 Physical properties of adhesive prepared for use . 14
6.3 Use of the adhesive . 14
7 Marking and labelling . 14
Annex A (normative) Delamination test for finger joints with separate spread of adhesive
and hardener . 15
A.1 Production of the specimens . 15
A.2 Testing . 16
A.3 Expression of results . 16
Bibliography . 17
2
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SIST EN 301:2023
EN 301:2023 (E)
European foreword
This document (EN 301:2023) 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 August 2023, and conflicting national standards shall
be withdrawn at the latest by August 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 301:2017.
EN 301:2023 includes the following significant technical changes with respect to EN 301:2017:
a) Table 2 — 2 mm glue line – EN 302-3 Mandatory despite pH-value – beech used in the test;
b) Table 2 — Gap filling adhesives – EN 302-8 – tested with 1 mm glue line;
c) 5.1 b) test with representative samples of preservative treated Scots pine or Silver fir, which also
covers preservative treated Norway spruce, has been added.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
3
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SIST EN 301:2023
EN 301:2023 (E)
Introduction
This document is one of a series of standards dealing with phenolic and aminoplastic adhesives for use
with timber structures, and is published in support of product standards for load-bearing timber
structures in connection with EN 1995-1-1, Eurocode 5: Design of timber structures — Part 1-1:
General — Common rules and rules for buildings.
The series consists of:
— one standard for classification and performance requirements (EN 301);
— six test methods (EN 302-1, EN 302-2, EN 302-3, EN 302-4, EN 302-8 and Annex A of this
document) used to assess the performance of adhesives after specified heat and humidity
treatments; and
— three test methods (EN 302-5, EN 302-6 and EN 302-7) to characterize the working properties of
the adhesive.
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 may have a negative
environmental impact. As technological advantages lead to acceptable alternatives for these materials,
they will be eliminated from this standard to the greatest extent possible.
At the end of the test, the user of the standard should take care to carry out an appropriate disposal of
the wastes, according to local regulations.
4
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SIST EN 301:2023
EN 301:2023 (E)
1 Scope
This document establishes a classification for phenolic and aminoplastic polycondensation adhesives
according to their suitability for use for load-bearing timber products in defined climatic exposure
conditions, and specifies performance requirements for such adhesives for the factory manufacture or
factory-like manufacturing conditions of load-bearing timber products only.
This document only specifies the performance of an adhesive for use in an environment corresponding
to the defined conditions.
The performance requirements of this document are applicable to the adhesive only, not to the
manufacturing timber products. This document does not cover the performance of adhesives for on-site
gluing (except for factory-like conditions) or the production of wood-based panels, except solid wood
panels, or modified and stabilized wood with considerably reduced swelling and shrinkage properties,
e.g. acetylated wood, heat treated wood and polymer impregnated wood.
This document is primarily intended for use by adhesive manufacturers and for use in timber products
bonded with adhesives, to assess or control the quality of adhesives. The requirements are applicable to
the type testing of the adhesives. Production control activities are outside the scope of this document.
Adhesives meeting the requirements of this document are adequate for use in load-bearing timber
products, provided that the bonding process has been carried out according to an appropriate product
standard.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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-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 302-8, Adhesives for load-bearing timber structures — Test methods — Part 8: Static load test of
multiple bond line specimens in compression shear
EN 408, Timber structures — Structural timber and glued laminated timber — Determination of some
physical and mechanical properties
EN 923, Adhesives — Terms and definitions
EN 1245, Adhesives — Determination of pH
EN 12092, Adhesives — Determination of viscosity
5
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SIST EN 301:2023
EN 301:2023 (E)
EN 13183-2, Moisture content of a piece of sawn timber — Part 2: Estimation by electrical resistance
method
EN 13183-3, Moisture content of a piece of sawn timber — Part 3: Estimation by capacitance method
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 923 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
aminoplastic resin
thermosetting synthetic resin derived from a condensation reaction of the –NH groups or –NH groups
2
of amines or amides with aldehydes
3.2
phenolic resin
thermosetting synthetic resin derived from a condensation reaction of a phenol with an aldehyde
3.3
polycondensation adhesive
adhesive mixture made from a resin formed by a polymerization reaction involving the elimination of
water, usually with a hardener
Note 1 to entry: Such adhesives usually also contain extenders and/or fillers.
3.4
service class 1
climatic conditions characterized 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
Note 1 to entry: In service class 1, which comprises typical indoor conditions, the average moisture content in
most softwoods will not exceed 12 %.
[SOURCE: EN 1995-1-1:2004, 2.3.1.3, modified – Indoor conditions have been added in Note 1 to entry.]
3.5
service class 2
climatic conditions characterized 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
Note 1 to entry: In service class 2, to which most covered exterior conditions belong, the average moisture
content in most softwoods will not exceed 20 %.
[SOURCE: EN 1995-1-1:2004, 2.3.1.3 modified – Covered exterior conditions have been added in Note 1
to entry.]
6
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SIST EN 301:2023
EN 301:2023 (E)
3.6
service class 3
climatic conditions leading to higher moisture contents than in service class 2
Note 1 to entry: Exterior conditions typically belong to service class 3.
[SOURCE: EN 1995-1-1:2004, 2.3.1.3, modified – Note 1 to entry has been added.]
3.7
glue line
adhesive layer between the wood members
3.8
thick glue line
glue line of nominal thickness in the range of 0,3 mm to 2,0 mm at the time of bonding
Note 1 to entry: Thick glue lines are achieved by using spacers, grooves or similar devices when two plain
members are glued together.
3.9
close contact glue line
glue line of thickness maximum 0,1 mm
Note 1 to entry: Close contact glue line can be achieved by pressing together two plane wood members with a
2
clamping pressure of (0,8 ± 0,1) N/mm without additional grooves, spacers or similar devices.
4 Classification
Adhesives (General purpose, Finger jointing or Gap filling) for structural purposes 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 adhesive, I and II, are classified according to their suitability for use in different climatic
conditions:
— Type Ι to be used in service classes 1, 2 and 3.
— Type ΙΙ to be used in service class 1 only.
These two types of adhesive are further divided into three application area according to the end use:
— General-purpose adhesive (GP) to be used for glue lines between laminations, for finger joints in
laminations and structural timber, and for large finger joints;
— Finger jointing adhesive (FJ) to be used for finger jointing of laminations and structural timber
only;
— Gap filling adhesive (GF) to be used for fibre parallel gluing, e.g. glue lines between glulam
components of block-glued glulam and for large finger joints. Gap filling adhesives are in addition
classified as application area GP and FJ in mixed application without further testing.
NOTE The definition of “General purpose” and “Type” can be different in other standards.
7
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SIST EN 301:2023
EN 301:2023 (E)
Table 1 specifies the thirteen adhesive classes for which this document is applicable to and their
designation codes. The designation code consist of:
— type: Ι or ΙΙ;
— application: GP, FJ or GF;
— maximum test temperature in degrees Celsius: 70 or 90 for type Ι, or maximum use temperature in
degrees Celsius: 50 for type ΙΙ;
— use: M for mixed application, and S for separate application of adhesive and hardener.
All application areas and use shall be part of the designation code.
EXAMPLE Designation code EN 301 I 70 GP 0,6M and designation code EN 301 I 70 FJ 0,1S, if classified as
general purpose adhesive for mixed application and classified as finger joint adhesive for separate application.
Table 1 — Adhesive classes
Adhesive class
Max. glue line
Max. test Service
thickness
Application area
c a
temp. classes
(Designation code)
Test Use
°C mm mm
Face lamination and
finger jointing for general
use
General purpose 70 1,0 0,6 1,2,3
EN 301 I 70 GP 0,6M
General purpose 70 1,0 0,3 1,2,3
EN 301 I 70 GP 0,3S
Special use
Gap filling 90 2,0 1,5 1, 2, 3
EN 301 I 90 GF 1,5M
General purpose 90 1,0 0,6 1, 2, 3
EN 301 I 90 GP 0,6M
General purpose 90 1,0 0,3 1, 2, 3
EN 301 I 90 GP 0,3S
Finger joint 90 0,3 0,1 1, 2, 3
EN 301 I 90 FJ 0,1M
Finger joint 90 0,3 0,1 1, 2, 3
EN 301 I 90 FJ 0,1S
Finger joint 70 0,3 0,1 1, 2, 3
EN 301 I 70 FJ 0,1M
Finger joint 70 0,3 0,1 1, 2, 3
EN 301 I 70 FJ 0,1S
b
General purpose 1,0 0,6
...
SLOVENSKI STANDARD
oSIST prEN 301:2022
01-marec-2022
Lepila na osnovi fenolov in aminoplastov za nosilne lesene konstrukcije -
Razvrstitev in zahteve za delovanje
Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification
and performance requirements
Klebstoffe, Phenoplaste und Aminoplaste, für tragende Holzbauteile - Klassifizierung und
Leistungsanforderungen
Adhésifs de nature phénolique et aminoplaste, pour structures portantes en bois -
Classification et exigences de performance
Ta slovenski standard je istoveten z: prEN 301
ICS:
83.180 Lepila Adhesives
91.080.20 Lesene konstrukcije Timber structures
oSIST prEN 301:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 301:2022
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oSIST prEN 301:2022
DRAFT
EUROPEAN STANDARD
prEN 301
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2021
ICS 83.180 Will supersede EN 301:2017
English Version
Adhesives, phenolic and aminoplastic, for load-bearing
timber structures - Classification and performance
requirements
Adhésifs de nature phénolique et aminoplaste, pour Klebstoffe, Phenoplaste und Aminoplaste, für tragende
structures portantes en bois - Classification et Holzbauteile - Klassifizierung und
exigences de performance Leistungsanforderungen
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 301:2021 E
worldwide for CEN national Members.
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oSIST prEN 301:2022
prEN 301:2021 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Classification . 7
5 Requirements . 10
5.1 General . 10
5.2 Tensile shear test . 12
5.3 Delamination test . 13
5.4 Fibre damage test . 13
5.5 Shrinkage test . 14
5.6 Static load test . 14
5.7 Type testing of separate application finger joint adhesive . 14
6 Working properties of the adhesive . 14
6.1 General . 14
6.2 Physical properties of adhesive prepared for use . 15
6.3 Use of the adhesive . 15
7 Marking and labelling . 15
Annex A (normative) Delamination test for finger joints with separate spread of adhesive
and hardener . 16
A.1 Production of the specimens . 16
A.2 Testing . 16
A.3 Expression of results . 17
2
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oSIST prEN 301:2022
prEN 301:2021 (E)
European foreword
This document (prEN 301:2021) has been prepared by Technical Committee CEN/TC 193 “Adhesives”,
the secretariat of which is held by UNE.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 301:2017.
Compared to EN 301:2017 the following modifications have been made:
a) EN 302-5, EN 302-6 and EN 302-7 added under normative references.
b) Table 2 – 2 mm glue line – EN 302-3 Mandatory despite pH-value – beech used in the test.
c) Table 2 – Gap filling adhesives – EN 302-8 – tested with 1 mm glueline.
d) Clause 5.1 b) test with representative samples of preservative treated Scots pine or Silver fir also
covers preservative treated Norway spruce, has been added.
e) The Bibliography has been deleted.
3
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oSIST prEN 301:2022
prEN 301:2021 (E)
Introduction
This document is one of a series of standards dealing with phenolic and aminoplastic adhesives for use
with timber structures, and is published in support of product standards for load-bearing timber
structures in connection with EN 1995-1-1 Eurocode 5: Design of timber structures — Part 1-1: General —
Common rules and rules for buildings. The series consists of one standard for classification and
performance requirements (EN 301), five test methods (EN 302-1, EN 302-2, EN 302-3 and EN 302-4 and
EN 302-8) used to assess the performance of adhesives after specified heat and humidity treatments, and
three test methods (EN 302-5, EN 302-6 and EN 302-7) to characterize the working properties of the
adhesive.
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 may have a negative environmental
impact. As technological advantages lead to acceptable alternatives for these materials, they will be
eliminated from this standard to the greatest extent possible.
At the end of the test, the user of the standard should take care to carry out an appropriate disposal of
the wastes, according to local regulations.
4
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oSIST prEN 301:2022
prEN 301:2021 (E)
1 Scope
This document establishes a classification for phenolic and aminoplastic polycondensation adhesives
according to their suitability for use for load-bearing timber structures in defined climatic exposure
conditions, and specifies performance requirements for such adhesives for the factory manufacture or
factory-like manufacturing conditions of load-bearing timber structures only.
This document only specifies the performance of an adhesive for use in an environment corresponding
to the defined conditions.
The performance requirements of this document apply to the adhesive only, not to the timber structure.
This document does not cover the performance of adhesives for on-site gluing (except for factory-like
conditions) nor the production of wood-based panels, except solid wood panels, or modified and
stabilized wood with considerably reduced swelling and shrinkage properties, e.g. such as acetylated
wood, heat treated wood and polymer impregnated wood.
This document 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. The requirements apply
to the type testing of the adhesives. Production control activities are outside the scope of this document.
Adhesives meeting the requirements of this document are adequate for use in a load-bearing timber
structures, provided that the bonding process has been carried out according to an appropriate product
standard.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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-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 302-5, Adhesives for load-bearing timber structures - Test methods - Part 5: Determination of maximum
assembly time under referenced conditions
EN 302-6, Adhesives for load-bearing timber structures - Test methods - Part 6: Determination of the
minimum pressing time under referenced conditions
EN 302-7, Adhesives for load-bearing timber structures - Test methods - Part 7: Determination of the
working life under referenced conditions
EN 302-8, Adhesives for load-bearing timber structures - Test methods - Part 8: Static load test of multiple
bond line specimens in compression shear
EN 408, Timber structures Structural timber and glued laminated timber Determination of some physical
and mechanical properties
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EN 923, Adhesives - Terms and definitions
EN 1245, Adhesives - Determination of pH
EN 1995-1-1:2004, Eurocode 5: Design of timber structures - Part 1-1: General - Common rules and rules
for buildings
EN 12092, Adhesives - Determination of viscosity
EN 13183-2, Moisture content of a piece of sawn timber - Part 2: Estimation by electrical resistance method
EN 13183-3, Moisture content of a piece of sawn timber - Part 3: Estimation by capacitance method
EN 14080, Timber structures - Glued laminated timber and glued solid timber - Requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 923 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• ISO Online browsing platform: available at https://www.iso.org/obp
• IEC Electropedia: available at https://www.electropedia.org/
3.1
aminoplastic resin
thermosetting synthetic resin derived from a condensation reaction of the –NH groups or –NH2 groups
of amines or amides with aldehydes
3.2
phenolic resin
thermosetting synthetic resin derived from a condensation reaction of a phenol with an aldehyde
3.3
polycondensation adhesive
adhesive mixture made from a resin formed by a polymerization reaction involving the elimination of
water, usually with a hardener
Note 1 to entry: Such adhesives usually also contain extenders and/or fillers.
3.4
service class 1
climatic conditions characterized 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
Note 1 to entry: In service class 1, which comprises typical indoor conditions, the average moisture content in
most softwoods will not exceed 12 %.
[SOURCE: EN 1995-1-1:2004, 2.3.1.3]
3.5
service class 2
climatic conditions characterized 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
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Note 1 to entry: In service class 2, to which most covered exterior conditions belong, the average moisture
content in most softwoods will not exceed 20 %.
[SOURCE: EN 1995-1-1:2004, 2.3.1.3]
3.6
service class 3
climatic conditions leading to higher moisture contents than in service class 2
Note 1 to entry: Exterior conditions typically belong to service class 3.
[SOURCE: EN 1995-1-1:2004, 2.3.1.3, modified – Note 1 to entry has been added.]
3.7
glue line
adhesive layer between the wood members
3.8
thick glue line
glue line of nominal thickness in the range of 0,3 mm to 2,0 mm at the time of bonding
Note 1 to entry: Thick glue lines are achieved by using spacers, grooves or similar devices with a thickness of
0,3 mm to 2,0 mm when two plain members are glued together.
3.9
close contact glue line
glue line of thickness maximum 0,1 mm
Note 1 to entry: Close contact glue line can be achieved by pressing together two plane wood members with a
2
clamping pressure of (0,8 ± 0,1) N/mm without additional grooves, spacers or similar devices.
4 Classification
Adhesives (general purpose, finger jointing or gap filling) for structural purposes 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 adhesive, I and II, are classified according to their suitability for use in different climatic
conditions:
— Type Ι to be used in service classes 1, 2 and 3 (EN 1995-1-1:2004).
— Type ΙΙ to be used in service class 1 only.
NOTE The application of the adhesive types in the different service classes can be restricted by national
regulations applicable at the end use site of the bonded timber structure.
These two types of adhesive are further divided into three subclasses according to the end use:
— general-purpose adhesive (GP) to be used for glue lines between laminations, for finger joints in
laminations and structural timber, and for large finger joints;
— finger jointing adhesive (FJ) to be used for finger jointing of laminations and structural timber only;
— gap filling adhesive (GF) to be used for fibre parallel gluing, e.g. glue lines between glulam
components of block-glued glulam and for large finger joints. Gap filling adhesives can in addition be
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classified as application type GP usable for glue lines between laminations and for finger jointing of
laminations and structural timber.
Table 1 specifies the thirteen adhesive classes for which this document applies and their designations.
The designations consist of:
— type: Ι or ΙΙ;
— application: GP, FJ or GF;
— maximum test temperature in degrees Celsius: 70 or 90 for type Ι, or maximum use temperature in
degrees Celsius: 50 for type ΙΙ;
— use: M for mixed application, and S for separate application of adhesive and hardener.
Each application area and use shall be part of the designation.
EXAMPLE EN 301 I 70 GP 0,6M and EN 301 I 70 FJ 0,1S if classified as general purpose adhesive for mixed
application and classified as finger joint adhesive for separate application.
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Table 1 — Adhesive classes
Adhesive type Application
Max. glue line
Max. test Service
thickness
Designation
c a
temp. classes
mm
°C Test Use
Face lamination and finger
jointing for general use
d
EN 301 I 70 GP 0,6M General purpose 70 1,0 0,6 1,2,3
EN 301 I 70 GP 0,3
...
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