SIST EN 15416-4:2025

SLOVENSKI STANDARD
01-december-2025
Lepila (razen fenolnih ali aminskih) za nosilne lesene konstrukcije - Preskusne
metode - 4. del: Ugotavljanje odprtega časa pri referenčnih pogojih
Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test
methods - Part 4: Determination of open assembly time under referenced conditions
Klebstoffe für tragende Holzbauteile ausgenommen Phenolharzklebstoffe und
Aminoplaste - Prüfverfahren - Teil 4: Bestimmung der offenen Wartezeit bei
Referenzbedingungen
Adhésifs pour structures portantes en bois de type autre que phénolique et aminoplaste -
Méthodes d'essais - Partie 4 : Détermination du temps d'assemblage ouvert dans des
conditions de référence
Ta slovenski standard je istoveten z: EN 15416-4:2025
ICS:
83.180 Lepila Adhesives
91.080.20 Lesene konstrukcije Timber structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 15416-4
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2025
EUROPÄISCHE NORM
ICS 83.180 Supersedes EN 15416-4:2017
English Version
Adhesives for load bearing timber structures other than
phenolic and aminoplastic - Test methods - Part 4:
Determination of open assembly time under referenced
conditions
Adhésifs pour structures portantes en bois de type Klebstoffe für tragende Holzbauteile ausgenommen
autre que phénolique et aminoplaste - Méthodes Phenolharzklebstoffe und Aminoplaste - Prüfverfahren
d'essais - Partie 4 : Détermination du temps - Teil 4: Bestimmung der offenen Wartezeit bei
d'assemblage ouvert dans des conditions de référence Referenzbedingungen
This European Standard was approved by CEN on 11 August 2025.

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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15416-4:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Principle . 7
5 Apparatus . 7
6 Procedure . 7
6.1 General. 7
6.2 Preparation of bonded assemblies . 7
6.3 Preparation of samples for testing . 8
6.4 Test procedure . 8
7 Expression of results . 8
7.1 Tensile shear strength . 8
7.2 Failure mode . 8
7.3 Glue line thickness . 9
8 Requirement . 9
9 Test report . 9
9.1 General information . 9
9.2 Information about the adhesive . 9
9.3 Preparation of test pieces and testing procedure . 9
9.4 Test results . 10

European foreword
This document (EN 15416-4:2025) 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 April 2026, and conflicting national standards shall be
withdrawn at the latest by April 2026.
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 15416-4:2017.
a) terms and definitions for glue line added;
b) determination of glue line thickness in 6.3 described in more detail;
c) expression of glue line thickness added as 7.3;
d) different spread rates and glue line thicknesses considered in the requirement in Clause 8.
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.
Introduction
This document is one of a series dealing with adhesives for use with timber structures, and is published
in support of the EN 1995 series, Eurocode 5: Design of timber structures. The series consists of five
classification and performance requirements for adhesives for load-bearing timber structures, phenolic
and aminoplastic adhesives (EN 301), one component polyurethane adhesives (EN 15425), emulsion
polymer isocyanate adhesives (EN 16254), two component epoxy and polyurethane adhesives for glued
in rods (EN 17334) and for on-site repair of cracked timber structures (EN 17418) 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 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 perpendicular to the glue line (Glass house 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
EN 15425, Adhesives — One component polyurethane (PUR) for load-bearing timber structures —
Classification and performance requirements
EN 16254, Adhesives — Emulsion polymer isocyanate (EPI) for load-bearing timber structures —
Classification and performance requirements
EN 17334, Glued-in rods in glued structural timber products — Testing, requirements and bond shear
strength classification
EN 17418, Two-component epoxy and polyurethane adhesives for on-site repair of cracked timber
structures — Testing, requirements and repair strength verification
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 document can have negative environmental
impact. As technological advantages lead to better alternatives for these materials, they will be eliminated
from this document to the extent possible.
At the end of the test, it is recommended that the user of this document take care to carry out an
appropriate disposal of the wastes.
NOTE Local regulations can apply.
1 Scope
This document specifies a laboratory method of determining the open assembly time under referenced
conditions in standard climate (20 ± 2) °C and (65 ± 5) % relative humidity (hereafter climate [20/65]).
The method gives a result that cannot be applied to the safe manufacture of timber structures without
taking into account the influence of factors such as timber density, moisture content, factory temperature
and relative air humidity.
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 302-1:2023, Adhesives for load-bearing timber structures — Test methods — Part 1: Determination of
longitudinal tensile shear strength
EN 923, Adhesives — Terms and definitions
ISO 5893, Rubber and plastics test equipment — Tensile, flexural and compression types (constant rate of
traverse) — Specification
ISO 6344-2, Coated abrasives — Determination and designation of grain size distribution — Part 2:
Macrogrit sizes P12 to P220
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
glue line
adhesive layer between the wood members
3.2
open assembly time
interval between adhesive application to the adherends and assembly of the joint
[SOURCE: EN 923:2015, 2.6.60, modified – Parts of the definition deleted]
3.3
maximum open assembly time
maximum interval between adhesive application to the adherends and assembly of the joint without loss
of bond strength
Note 1 to entry: Loss of strength is specified as a shear strength of < 10 N/mm in this document.
[SOURCE: EN 923:2015, 2.6.60, modified – Term changed and Note 1 to entry added]
4 Principle
Standard beech lap joints are tested in tensile shear after various open assembly times until it is found
that the shear strength
...