SIST EN 15416-5:2025

Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test methods - Part 5: Determination of minimum pressing time under referenced conditions

This document specifies a laboratory method of determining the minimum pressing time for glue line thicknesses close contact, 0,2 mm, 0,3 mm and 0,5 mm, at three temperatures and three wood moisture contents.
This document is intended to determine the minimum pressing time using a specified procedure for obtaining a reliable base for comparison of minimum pressing time between adhesives under referenced conditions.
The method gives a result that cannot be applied to the safe manufacture of timber structures without taking into account the influence in variation of factors such as timber density, wood moisture content, factory temperature and relative air humidity.

Klebstoffe für tragende Holzbauteile ausgenommen Phenolharzklebstoffe und Aminoplaste - Prüfverfahren - Teil 5: Bestimmung der Mindestpresszeit bei Referenzbedingungen

Dieses Dokument legt ein Laborverfahren zur Bestimmung der Mindestpresszeit für die Klebstofffugendicken dünn, 0,2 mm, 0,3 mm und 0,5 mm bei drei Temperaturen und drei Holzfeuchten fest.
Dieses Dokument ist zur Bestimmung der Mindestpresszeit mit einem festgelegten Verfahren vorgesehen, um eine zuverlässige Grundlage zum Vergleich der Mindestpresszeiten verschiedener Klebstoffe bei Referenzbedingungen zu schaffen.
Das Verfahren führt zu einem Ergebnis, das für die sichere Herstellung von Holzbauteilen nur unter Berücksichtigung der Einflussfaktoren, wie z. B. Rohdichte und Feuchtegehalt des Holzes, Werkstemperatur und relative Luftfeuchte, zugrunde gelegt werden kann.

Adhésifs pour structures portantes en bois de type autre que phénolique et aminoplaste - Méthodes d'essais - Partie 5 : Détermination du temps de pressage minimal dans des conditions de référence

Le présent document spécifie une méthode de détermination en laboratoire du temps de pressage minimal pour des joints de colle minces de 0,2 mm, 0,3 mm et 0,5 mm, à trois températures et trois teneurs en humidité du bois.
Le présent document est destiné à déterminer le temps de pressage minimal en utilisant un mode opératoire spécifié afin d’obtenir une base fiable de comparaison des temps de pressage minimaux de différents adhésifs dans des conditions de référence.
La méthode conduit à un résultat qui ne peut pas être utilisé pour une fabrication sûre des structures en bois sans tenir compte de l’influence de facteurs tels que la masse volumique du bois, sa teneur en humidité, la température de l’usine et l’humidité relative de l’air.

Lepila za nosilne lesene konstrukcije, razen fenolnih in aminoplastnih - Preskusne metode - 5. del: Ugotavljanje najkrajšega časa stiskanja pri referenčnih pogojih

General Information

• Status: Published
• Public Enquiry End Date: 29-Jun-2024
• Publication Date: 04-Nov-2025
• ICS: 83.180 - Adhesives
• ICS: 91.080.20 - Timber structures
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 27-Oct-2025
• Due Date: 01-Jan-2026
• Completion Date: 05-Nov-2025
• Ref Project: EN 15416-5:2025 - Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test methods - Part 5: Determination of minimum pressing time under referenced conditions

Relations

• Revises: SIST EN 15416-5:2017 - Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test methods - Part 5: Determination of minimum pressing time under referenced conditions
• Effective Date: 14-Jun-2023

Overview

EN 15416-5:2025 - published by CEN - is a laboratory test method for adhesives for load-bearing timber structures (other than phenolic and aminoplastic). The standard defines a repeatable procedure to determine the minimum pressing time under referenced conditions for glue line thicknesses close contact, 0.2 mm, 0.3 mm and 0.5 mm. It is intended to provide a reliable basis for comparing minimum pressing times between adhesives, while noting that test results alone cannot be directly applied to safe production without accounting for real-world variations (timber density, factory temperature, RH, etc.).

Key topics and technical requirements

• Scope and objectives: Determine minimum pressing time for adhesives used in timber structures at specified glue line thicknesses and referenced conditions (temperature and wood moisture).
• Test materials: Standard beech lap joints or individual single lap joint pieces for very fast-setting adhesives.
• Referenced conditions:
  • Wood moisture contents: (9 ± 1) %, (12 ± 1) %, (15 ± 1) %.
  • Test temperatures: nominally 15 °C, 20 °C and 30 °C (with required climate control).
  • Glue line thicknesses: close contact (≤0.1 mm), 0.2 mm, 0.3 mm, 0.5 mm.
• Performance criterion: The method identifies the shortest pressing time that achieves a minimum tensile shear strength (see Clause 4 principle - tensile shear ≥ 4 N/mm under referenced conditions).
• Apparatus and procedure: Climate cabinets for conditioning, testing machine capable of constant rate loading (≈2.0 kN/min or ISO 5893 crosshead control), panel preparation, cutting and processing times, and a defined calculation method for minimum pressing time (updated in 2025 edition).
• Definitions and clarifications: Distinguishes pressing time from curing time; introduces provisions for preparing individual test pieces; updated calculation procedure compared with EN 15416-5:2017.

Applications and users

Who uses EN 15416-5:2025:

• Adhesive manufacturers developing or comparing timber adhesives (PUR, EPI and others covered by EN 15416 series).
• Materials/test laboratories performing quality control, R&D and type testing.
• Timber product manufacturers (finger-jointing, glued laminated timber) optimizing press cycles and glue line specifications.
• Certification bodies and standards committees verifying performance under referenced conditions.

Practical uses:

• Comparative bench-marking of minimum pressing time across adhesive formulations.
• Supporting product datasheets, manufacturing process design, and laboratory-based process optimization.
• Informing but not replacing factory validation - results must be adjusted for production variables before use in safe manufacture.

Related standards

• EN 15416 (other parts), EN 15416-1, -3, -4
• EN 302-1 (tensile shear strength)
• EN 15425 (PUR adhesives), EN 16254 (EPI adhesives)
• EN 923 (terms & definitions), ISO 5893 (testing machine specification)

Keywords: EN 15416-5:2025, minimum pressing time, adhesives for timber structures, glue line thickness, beech lap joints, timber adhesive testing, CEN standard.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2025
Lepila za nosilne lesene konstrukcije, razen fenolnih in aminoplastnih - Preskusne
metode - 5. del: Ugotavljanje najkrajšega časa stiskanja pri referenčnih pogojih
Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test
methods - Part 5: Determination of minimum pressing time under referenced conditions
Klebstoffe für tragende Holzbauteile ausgenommen Phenolharzklebstoffe und
Aminoplaste - Prüfverfahren - Teil 5: Bestimmung der Mindestpresszeit bei
Referenzbedingungen
Adhésifs pour structures portantes en bois de type autre que phénolique et aminoplaste -
Méthodes d'essais - Partie 5 : Détermination du temps de pressage minimal dans des
conditions de référence
Ta slovenski standard je istoveten z: EN 15416-5:2025
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 15416-5
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2025
EUROPÄISCHE NORM
ICS 83.180 Supersedes EN 15416-5:2017
English Version
Adhesives for load bearing timber structures other than
phenolic and aminoplastic - Test methods - Part 5:
Determination of minimum pressing 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 5 : Détermination du temps de - Teil 5: Bestimmung der Mindestpresszeit bei
pressage minimal 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 15416-5:2025 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 . 8
5 Apparatus . 8
5.1 Climate cabinets . 8
5.2 Testing machine . 8
6 Procedure . 8
6.1 General. 8
6.2 Preparation of the bonded assemblies (panels). 9
6.3 Preparation of test pieces from beech panels . 10
6.4 Preparation of individual single lap joint test pieces with close contact glue line . 10
6.5 Test procedure . 11
7 Expression of results . 11
7.1 Tensile shear strength . 11
7.2 Failure mode . 11
8 Calculation of minimum pressing time under referenced conditions . 11
9 Test report . 14
9.1 General information . 14
9.2 Information about the adhesive . 14
9.3 Preparation of test pieces and testing procedure . 14
9.4 Test results . 14

European foreword
This document (EN 15416-5:2025) 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 15416-5:2017.
a) glue line thickness 0,5 mm added in the scope;
b) distinction between pressing time and curing time introduced in Clause 3;
c) glue line thickness for different application areas in 6.1 described in more detail;
d) provisions for preparation of individual test pieces added in 6.2, 6.4 and Clause 8;
e) a new way of calculating the pressing time introduced 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 minimum pressing time for glue line
thicknesses close contact, 0,2 mm, 0,3 mm and 0,5 mm, at three temperatures and three wood moisture
contents.
This document is intended to determine the minimum pressing time using a specified procedure for
obtaining a reliable base for comparison of minimum pressing time between adhesives under referenced
conditions.
The method gives a result that cannot be applied to the safe manufacture of timber structures without
taking into account the influence in variation of factors such as timber density, wood 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
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
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
pressing time
time for which an adhesive joint is pressed
3.2
curing time
time span between the end of the adhesive application and the start of the test
3.3
open assembly time
maximum interval between adhesive application to the adherends and assembly of the joint, without loss
of bond strength
[SOURCE: EN 923:2015, 2.6.60, modified — The Synonym “open time” has been deleted]
3.4
closed assembly time
interval between assembly of the adhesive joint and the initiation of heat and/or pressure of the setting
process in the assembled joint
[SOURCE: EN 923:2015, 2.6.63]
3.5
total assembly time
time span between the start of the adhesive application
...