EN 16254:2023
(Main)Adhesives - Emulsion polymer isocyanate (EPI) for load-bearing timber structures - Classification and performance requirements
Adhesives - Emulsion polymer isocyanate (EPI) for load-bearing timber structures - Classification and performance requirements
This document establishes a classification for emulsion polymer isocyanate (EPI) adhesives according to their suitability for use in load-bearing timber products in defined climatic exposure conditions, and specifies performance requirements for such adhesives for the industrial manufacture of load-bearing timber products only.
The performance requirements of this document are applicable to the adhesives only, not to the 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. This document only specifies the performance of an adhesive for use in an environment corresponding to the defined conditions.
Such an adhesive meeting the requirements of this document for its type is adequate for use in load-bearing timber products, provided that the bonding process has been carried out according to an appropriate product standard.
Klebstoffe - Emulsionspolymer-Isocyanat (EPI) für tragende Holzbauteile - Klassifizierung und Leistungsanforderungen
Dieses Dokument stellt eine Klassifizierung für Klebstoffe aus Emulsionspolymer-Isocyanat (EPI) entsprechend ihrer Eignung zur Verwendung für tragende Holzprodukte unter bestimmten Klimabedingungen auf und legt die Leistungsanforderungen für derartige Klebstoffe ausschließlich zur werksmäßigen Herstellung von tragenden Holzprodukten fest.
Die Leistungsanforderungen in diesem Dokument sind lediglich für den Klebstoff, nicht für das Holzprodukt anwendbar. 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 anwendbar, wie z. B. acetyliertes Holz, wärmebehandeltes Holz und mit Kunstharz imprägniertes Holz.
Dieses Dokument ist in erster Linie für die Verwendung durch die Hersteller der Klebstoffe und der verklebten Holzprodukte bestimmt, um die Qualität von Klebstoffen zu beurteilen oder zu überprüfen. Dieses Dokument legt nur das Leistungsverhalten eines Klebstoffes für den Einsatz in einer Umgebung fest, die den festgelegten Bedingungen entspricht.
Klebstoffe, die die Anforderungen dieses Dokuments erfüllen, sind für den Einsatz in tragenden Holzprodukten geeignet, vorausgesetzt, dass der Verklebungsvorgang nach einer entsprechenden Produktnorm vorgenommen wurde.
Adhésifs - Isocyanate de polymère en émulsion (EPI) pour structures portantes en bois - Classification et exigences de performance
Le présent document établit une classification des adhésifs isocyanate de polymère en émulsion (EPI) 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.
Les exigences relatives à la performance définies dans le présent document ne s’appliquent qu’aux adhésifs et non aux produits 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, 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. Le présent document spécifie la performance d’un adhésif uniquement dans l’environnement correspondant aux conditions définies.
Un adhésif répondant aux exigences du présent document relatives à son type peut être utilisé dans des structures portantes en bois, à condition que le processus de collage ait été réalisé conformément à une norme de produit appropriée.
Lepila - Emulzijsko polimerizirani izocianat (EPI) za nosilne lesene konstrukcije - Razvrstitev in zahtevane lastnosti
Ta dokument določa razvrstitev za lepila na osnovi emulzijsko polimeriziranega izocianata (EPI) v skladu z njihovo primernostjo za uporabo pri nosilnih lesenih izdelkih v določenih pogojih izpostavljenosti podnebnim razmeram in določa zahteve glede učinkovitosti za ta lepila, izključno za industrijsko izdelavo nosilnih lesenih izdelkov.
Zahteve glede učinkovitosti v tem dokumentu se uporabljajo samo za lepila, ne za lesene izdelke. 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 izdelkih, vezanih z lepili, za ocenjevanje ali nadzor kakovosti lepil. Ta dokument določa lastnosti lepila izključno za uporabo v okolju, ki ustreza podanim pogojem.
Tako lepilo, ki izpolnjuje zahteve tega dokumenta za svojo vrsto, je primerno za uporabo pri nosilnih lesenih izdelkih pod pogojem, da je bil postopek vezave izveden v skladu z ustreznim standardom za izdelek.
General Information
Relations
Overview
EN 16254:2023 - issued by CEN - specifies classification and performance requirements for emulsion polymer isocyanate (EPI) adhesives intended for the industrial manufacture of load-bearing timber structures. The standard defines how EPI adhesives are assessed for suitability in defined climatic exposure conditions (service classes) and sets mandatory test-based performance criteria. It applies to the adhesive product only - not the finished timber element - and is intended mainly for adhesive manufacturers and timber product producers.
Key topics and technical requirements
- Scope & limitations
- Applies to EPI adhesives (water-based emulsion polymers cross-linked with isocyanate).
- For industrial (factory) bonding of load-bearing timber products only; excludes on-site gluing (except factory-like conditions), most wood-based panels (except solid wood panels) and highly modified/stabilized woods (e.g., acetylated, heat-treated, polymer-impregnated).
- Classification
- Adhesives are classified according to suitability in climatic exposure conditions (service class 1 / service class 2), reflecting expected moisture-related performance.
- Performance tests referenced
- Bond strength in longitudinal tensile shear (EN 302-1)
- Resistance to delamination (EN 302-2)
- Tensile strength perpendicular to the bond line after climatic treatment (acid damage test, EN 302-3)
- Effect of wood shrinkage on shear strength (EN 302-4)
- Static load tests and creep deformation tests under cyclic climate (EN 302-8, EN 15416-3)
- Long-term sustained load “Glass house test” (EN 15416-1)
- Delamination test on finger-jointed pieces (Annex A / EN 301)
- Working properties: working life, open assembly time, pressing time (EN 302-7, EN 15416-4/5)
- Marking & labelling
- The standard requires clear identification of adhesive type and performance to support quality control and traceability.
Practical applications
- Ensures EPI adhesives used in manufacturing of: glulam, glued solid timber members, finger-jointed elements and other bonded load-bearing timber products meet durability and mechanical performance expectations.
- Used to demonstrate that an adhesive is adequate for load-bearing use in a given service class - provided the bonding process follows the relevant product standard (e.g., glulam production standards).
- Supports quality control, product development, supplier qualification and regulatory compliance for manufacturers and specifiers.
Who should use this standard
- Adhesive manufacturers developing and certifying EPI adhesives.
- Timber product manufacturers (glulam / engineered timber producers) assessing adhesive suitability.
- Product standards writers, test laboratories, and structural engineers specifying bonded timber in accordance with Eurocode 5 (EN 1995-1-1).
Related standards (selection)
- EN 302 series (test methods for adhesives)
- EN 15416 series (long-term and working property tests)
- EN 14080 (glued laminated timber)
- EN 923 (adhesive terminology)
By aligning with EN 16254:2023, manufacturers and specifiers can ensure EPI adhesives meet harmonized EU requirements for bonded, load-bearing timber under defined climatic exposures.
Frequently Asked Questions
EN 16254:2023 is a standard published by the European Committee for Standardization (CEN). Its full title is "Adhesives - Emulsion polymer isocyanate (EPI) for load-bearing timber structures - Classification and performance requirements". This standard covers: This document establishes a classification for emulsion polymer isocyanate (EPI) adhesives according to their suitability for use in load-bearing timber products in defined climatic exposure conditions, and specifies performance requirements for such adhesives for the industrial manufacture of load-bearing timber products only. The performance requirements of this document are applicable to the adhesives only, not to the 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. This document only specifies the performance of an adhesive for use in an environment corresponding to the defined conditions. Such an adhesive meeting the requirements of this document for its type is adequate for use in load-bearing timber products, provided that the bonding process has been carried out according to an appropriate product standard.
This document establishes a classification for emulsion polymer isocyanate (EPI) adhesives according to their suitability for use in load-bearing timber products in defined climatic exposure conditions, and specifies performance requirements for such adhesives for the industrial manufacture of load-bearing timber products only. The performance requirements of this document are applicable to the adhesives only, not to the 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. This document only specifies the performance of an adhesive for use in an environment corresponding to the defined conditions. Such an adhesive meeting the requirements of this document for its type is adequate for use in load-bearing timber products, provided that the bonding process has been carried out according to an appropriate product standard.
EN 16254:2023 is classified under the following ICS (International Classification for Standards) categories: 83.180 - Adhesives. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 16254:2023 has the following relationships with other standards: It is inter standard links to EN 16254:2013+A1:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN 16254:2023 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2023
Lepila - Emulzijsko polimerizirani izocianat (EPI) za nosilne lesene konstrukcije -
Razvrstitev in zahtevane lastnosti
Adhesives - Emulsion polymer isocyanate (EPI) for load-bearing timber structures -
Classification and performance requirements
Klebstoffe - Emulsionspolymerisiertes Isocyanat (EPI) für tragende Holzbauteile -
Klassifizierung und Leistungsanforderungen
Adhésifs - Isocyanate de polymère en émulsion (EPI) pour structures portantes en bois -
Classification et exigences de performance
Ta slovenski standard je istoveten z: EN 16254:2023
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 16254
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2023
EUROPÄISCHE NORM
ICS 83.180 Supersedes EN 16254:2013+A1:2016
English Version
Adhesives - Emulsion polymer isocyanate (EPI) for load-
bearing timber structures - Classification and performance
requirements
Adhésifs - Isocyanate de polymère en émulsion (EPI) Klebstoffe - Emulsionspolymerisiertes Isocyanat (EPI)
pour structures portantes en bois - Classification et für tragende 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 16254:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Classification . 8
5 Requirements . 10
5.1 General . 10
5.2 Bond strength in longitudinal tensile shear test . 10
5.3 Resistance to delamination . 11
5.4 Tensile strength perpendicular to the bond line after climatic treatment (acid
damage test) . 12
5.5 Effect of wood shrinkage on the shear strength. 12
5.6 Static load test of multiple bond line specimens in compression shear . 12
5.7 Creep deformation test at cyclic climate conditions with specimens loaded in
bending shear . 13
5.8 Long term sustained load test at cyclic climate conditions with specimens loaded
perpendicular to the bond line (“Glass house test”) . 13
5.9 Delamination test on finger-jointed test pieces . 13
6 Test methods . 13
6.1 General . 13
6.2 Determination of bond strength in longitudinal tensile shear test . 13
6.3 Determination of resistance to delamination . 13
6.4 Determination of tensile strength perpendicular to the bond line after climatic
treatment (acid damage test) . 13
6.5 Determination of the effect of wood shrinkage on the shear strength . 13
6.6 Static load test of multiple bond line specimens in compression shear . 14
6.7 Creep deformation test with specimens loaded in bending shear . 14
6.8 Long term sustained load test at cyclic climate conditions with specimens loaded
perpendicular to the bond line (“Glass house test”) . 14
6.9 Delamination test on finger-jointed test pieces . 14
7 Working properties of the adhesive . 14
7.1 General . 14
7.2 Determination of working life under reference conditions . 14
7.3 Determination of open assembly time under reference conditions. 15
7.4 Determination of pressing time under reference conditions . 15
8 Marking and labelling . 15
Annex A (normative) Delamination test for bonding of finger-joints . 16
A.1 Production of the specimens . 16
A.2 Testing . 17
A.3 Expression of results . 17
A.4 Test report . 18
A.4.1 Adhesive . 18
A.4.2 Preparation of test pieces and testing procedure . 18
A.4.3 Test results . 18
Annex B (informative) Product limitations and glulam production control for beams
produced with Small dimension adhesives . 19
B.1 Product limitations . 19
B.2 Control of the glue line thickness . 19
Bibliography . 20
European foreword
This document (EN 16254:2023) 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 16254:2013+A1:2016.
EN 16254:2013+A1:2016:
a) the title has been changed;
b) the designation of adhesive types has been modified and aligned with EN 301 and EN 15425;
c) the reference to EN 15416-2 has been replaced by reference to EN 302-8;
d) for the delamination test according to EN 302-2 with preservative treated wood, a test with Scots
pine (Pinus sylvestris) and Silver fir (Abieas alba) covers also Norway spruce (Picea abies L.);
e) for adhesive type FJ, the test according to EN 302-2 is required only with short closed assembly time,
and the test according to EN 15416-5 is only required with thin glue line;
f) Annex A on storage treatments for tests according to EN 302-1 has been deleted and replaced by
reference to EN 302-1, the storage time for the temperature treatment (A6, A7, A8) has therefore
been reduced from 72 h to 24 h;
g) for bonding of finger-joints in additional wood species, the test according to EN 302-2 may be
replaced by the delamination test on finger-joints from EN 301, which is specified as new Annex A.
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 emulsion polymer isocyanate (EPI) adhesives for use with
timber structures, and is published in support of product standards for bonded 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 16254);
— eight test methods (EN 302-1, EN 302-2, EN 302-3, EN 302-4, EN 302-8, EN 15416-1, EN 15416-3
and the test method given in Annex A of this document (“finger-joint delamination test”) used to
assess the performance of adhesives after specified heat and humidity treatments; and
— three test methods (EN 302-7, EN 15416-4 and EN 15416-5) to 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 document may have negative environmental
impact. As technological advantages lead to better alternatives for these materials, they will be eliminated
from this European Standard to the extent possible.
At the end of the test, it is recommended that the users of this document take care to carry out an
appropriate disposal of the wastes, according to local regulations.
1 Scope
This document establishes a classification for emulsion polymer isocyanate (EPI) adhesives according to
their suitability for use in load-bearing timber products in defined climatic exposure conditions, and
specifies performance requirements for such adhesives for the industrial manufacture of load-bearing
timber products only.
The performance requirements of this document are applicable to the adhesives only, not to the 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. This document only specifies the
performance of an adhesive for use in an environment corresponding to the defined conditions.
Such an adhesive meeting the requirements of this document for its type is 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 302-7, 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 923, Adhesives — Terms and definitions
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
EN 15416-1, 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)
EN 15416-3, Adhesives for load bearing timber structures other than phenolic and aminoplastic — Test
methods — Part 3: Creep deformation test at cyclic climate conditions with specimens loaded in bending
shear
EN 15416-4, Adhesives for load bearing timber structures other than phenolic and aminoplastic — Test
methods — Part 4: Determination of open assembly time under referenced conditions
EN 15416-5, Adhesives for load bearing timber structures other than phenolic and aminoplastic — Test
methods — Part 5: Determination of minimum pressing time under referenced conditions
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
emulsion polymer isocyanate (EPI) adhesive
water based emulsion polymer or a mixture of water based emulsion polymers cross-linked with an
isocyanate as hardener
3.2
service class 1
climatic conditions characterised by a moisture content in the materials corresponding to a temperature
of 20 °C and the relative humidity of the surrounding air only exceeding 65 % for a few weeks per year
Note 1 to entry: In service class 1, which comprises typical indoor conditions, the average moisture content in
most soft-woods will not exceed 12 %.
[SOURCE: EN 1995-1-1:2004, 2.3.1.3 modified – Indoor conditions have been added in Note 1 to entry.]
3.3
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.]
3.4
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.]
3.5
glue line
adhesive layer between the wood members
3.6
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
clamping pressure of (0,8 ± 0,1) N/mm without additional groves, spacers or similar devices.
3.7
thick glue line
glue line of nominal thickness in the range of 0,2 mm to 0,5 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.
4 Classification
Adhesives for structural purpose shall produce joints of such strength and durability that the integrity of
the bond is maintained in the assigned service class throughout the expected life of the structure.
EPI-adhesives according to EN 16254 are classified by type (climate condition in use), maximum test
temperature and maximum glue line thickness in use. These three classification criteria are subdivided
as follows:
Type I: to be used in service class 1 and 2.
Type II: to be used in service class 1 only.
Maximum test temperature: 50 °C, 70 °C or 90 °C.
Maximum glue line thickness in use: 0,1 mm, 0,2 mm and 0,3 mm.
Depending on the maximum glue line thickness in use, the adhesives are assigned to different application
areas as described below and shown in Table 1.
— General purpose adhesives (GP): to be used for bond lines between laminations (maximum glue
line thickness 0,3 mm) and for finger-joints in laminations and structural timber.
— Small dimension adhesives (SD): to be used in beams with a maximum cross section 45 000 mm
(maximum glue line thickness 0,2 mm) and for finger-joints in laminations and structural timber. The
beam width shall not exceed 180 mm and the beam height shall not exceed 300 mm.
— Finger-jointing adhesives (FJ): to be used for finger-jointing of laminations and structural timber
only (maximum glue line thickness 0,1 mm).
The application of EPI shall always be in mixed state. These adhesives shall be applied according to the
manufacturer's instructions.
NOTE The definition of “General purpose” and “Type” can be different in other standards.
Each area of application and use shall be given in the design
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EN 16254:2023は、エマルジョンポリマーイソシアネート（EPI）接着剤に関する標準化文書であり、負荷を支える木材構造物に対する適用の可否を定義するための分類を確立しています。この標準は、特定の気候条件下での負荷を支える木材製品に使用するために必要な性能要件も明示しています。 このドキュメントの主な強みは、接着剤の性能要件が明確に設定されている点にあります。接着剤メーカーや木材製品の製造者にとって、EPI接着剤の品質を評価・管理するための基準を提供しており、業界全体での合意に基づく品質向上が期待できます。加えて、指定された条件に適合する接着剤は、適切な製品標準に従って接合プロセスが行われている限り、負荷を支える木材製品に使用するのに適しています。 さらに、この文書は現場での接着作業や、木質パネルの生産における性能を対象としていないため、接着剤の性能要件が特に工場環境での使用に焦点を当てています。この点は、信頼性のある製品を確保する上で重要な要素です。 EN 16254:2023は、木材製品の製造において必要不可欠な基準を提供し、接着剤の適切な使用を促進するために大いに関連性があります。特に負荷を支える木材構造におけるエマルジョンポリマーイソシアネート接着剤の使用を対象とし、工業的な製造プロセスにおいて確かな品質基準をもたらすこの標準は、業界の発展に貢献するでしょう。
La norme SIST EN 16254:2023 offre une classification claire et précise des adhésifs à base de polymères émulsion d'isocyanate (EPI), spécifiquement conçue pour les structures en bois porteurs. Son champ d'application est centré sur la détermination de l’adéquation de ces adhésifs dans des conditions climatiques définies, garantissant ainsi leur performance et leur fiabilité pour les produits en bois porteurs. Un des points forts de cette norme réside dans ses exigences de performance, spécifiant les critères auxquels les adhésifs doivent répondre pour garantir une qualité optimale lors de la fabrication industrielle de produits en bois porteurs. Cela assure une homogénéité et une sécurité dans l'utilisation des adhésifs, ce qui est essentiel pour la durabilité des structures en bois portant des charges. Il est notable que la norme exclut les performances des adhésifs utilisés pour le collage sur site, sauf dans des conditions similaires à celles de l'usine, ce qui permet de concentrer l'attention sur la fabrication en milieu contrôlé. Cela suggère une pertinence particulière pour les fabricants d'adhésifs et les producteurs de bois qui utilisent ces produits dans un cadre industriel. De plus, elle met en évidence le fait que les adhésifs peuvent être efficaces pour les produits en bois porteurs, à condition que le processus de collage respecte les normes de produits appropriées. En somme, la norme SIST EN 16254:2023 est un document essentiel qui standardise et fixe des exigences claires, pertinentes pour les fabricants d'adhésifs et les producteurs de produits en bois, garantissant que l'utilisation des adhésifs EPI soit en adéquation avec les standards de qualité requis pour des structures en bois porteurs.
표준 EN 16254:2023은 하중을 지탱하는 목재 구조물에 사용되는 에멀전 폴리머 이소시아네이트(EPI) 접착제의 분류 및 성능 요구 사항을 정립하는 문서로, 매우 중요한 요소를 포함하고 있습니다. 이 표준은 다양한 기후 환경에서 하중을 지탱하는 목재 제품에 적합한 EPI 접착제를 분류하고, 산업용으로 생산되는 하중 목재 제품에 한한 성능 요구 사항을 명확히 하고 있습니다. 표준의 주요 강점은 접착제의 품질을 평가하거나 통제할 수 있는 기준을 제공한다는 점입니다. 접착제를 사용하여 결합된 목재 제품을 제조하는 과정에서, 이 표준은 접착제가 특정 환경에서 사용될 때의 성능을 규정하므로, 제조업체가 더욱 신뢰할 수 있는 제품을 생산할 수 있도록 돕습니다. 이는 접착제가 하중을 지탱하는 목재 제품을 위해 적합하다는 것을 보증하는 중요한 기준으로 작용합니다. 또한, EN 16254:2023 표준은 공장에서의 조립 조건을 제외한 현장 접착이나 합판 생산에는 적용되지 않으며, 이는 제품의 성능 요구 사항을 명확히 하여 사용자의 혼란을 줄이는 데 기여합니다. 특히, 기존의 나무와 다르게 수축 및 팽창이 현저히 저감된 수정된 목재와 같은 재료에 대한 성능은 다루지 않으므로, 사용자는 해당 제품에 대한 적절한 기준을 설정한 후에도 더욱 신뢰할 수 있는 결정을 내릴 수 있습니다. 이 문서는 주로 접착제 제조업체와 접착제를 이용해 결합된 목재 제품의 품질을 관리하는 이들에게 적합하게 설계되어 있어, EPI 접착제를 이용한 산업적 응용의 신뢰성을 높이는 중요한 역할을 합니다. 따라서, EN 16254:2023 표준은 하중을 지탱하는 목재 제품을 위한 EPI 접착제의 필수적인 성능 기준을 제시하며, 건축 및 목재 산업에서의 활용성을 높이는 데 크나큰 기여를 할 것입니다.
Die Norm EN 16254:2023 legt eine Klassifizierung für Emulsionspolymerisocyanat (EPI) Klebstoffe fest, die speziell für Anwendungen in tragenden Holzstrukturen unter definierten klimatischen Bedingungen geeignet sind. Diese Norm ist von entscheidender Bedeutung, da sie spezifische Leistungsanforderungen für Klebstoffe definiert, die ausschließlich in der industriellen Herstellung von tragenden Holzprodukten verwendet werden. Dies spricht die Bedürfnisse von Klebstoffherstellern sowie die Anforderungen an die Qualitätssicherung von verbundenen Holzprodukten an. Ein hervorstechendes Merkmal der EN 16254:2023 ist ihre klare Fokussierung auf die Benutzerfreundlichkeit für Hersteller von Klebstoffen. Die Norm liefert eine präzise Grundlage zur Klassifizierung, was die Auswahl des richtigen Klebstoffs für bestimmte Anwendungen erheblich erleichtert. Die Festlegung von Leistungsanforderungen, die einzig für Klebstoffe gelten und nicht für die Holzprodukte selbst, reduziert potenzielle Verwirrung und schafft mehr Klarheit im Anwendungsbereich der Norm. Die Relevanz dieser Norm liegt auch im klaren Ausschluss von Klebstoffperformanzen für vor Ort durchgeführte Verklebungen, es sei denn, diese erfolgen unter werkstattähnlichen Bedingungen. Dies könnte die Verwendung der Norm für spezifische industrielle Anwendungen noch weiter einschränken, was für Unternehmen, die sich auf die Herstellung tragender Holzprodukte spezialisiert haben, von Bedeutung ist. Zudem wird die Produktion von Holzwerkstoffen wie Furnierplatten oder modifiziertem Holz, das erheblich reduzierte Schwindungseigenschaften aufweist, nicht erfasst, was die Norm fokussierter und spezialisierter macht. Zusammenfassend bietet die EN 16254:2023 eine wertvolle Ressource für die Branche, indem sie mithilfe spezifischer Klassifizierungen und Leistungsanforderungen einen klaren Leitfaden für die Verwendung von EPI-Klebstoffen in tragenden Holzstrukturen bietet. Dies fördert nicht nur die Qualität und Sicherheit der Endprodukte, sondern unterstützt auch die Effizienz in der industriellen Herstellung von Holzprodukten.
The EN 16254:2023 standard offers a crucial framework for the classification and performance requirements of emulsion polymer isocyanate (EPI) adhesives intended for load-bearing timber structures. The document serves a specific scope by establishing criteria that ensure these adhesives are suitable for use in timber products subjected to defined climatic exposure conditions, which is vital for maintaining structural integrity and safety. One of the primary strengths of this standard is its detailed focus on performance requirements tailored specifically for industrial applications in the manufacture of load-bearing timber products. By concentrating solely on the adhesives and not extending into the performance of the timber products themselves, the standard fosters clarity and precision, enabling manufacturers to assess and control the quality of adhesives effectively. The relevance of this standard cannot be overstated, especially as the industry increasingly relies on advanced adhesive technologies for load-bearing applications. By adhering to the specifications outlined in EN 16254:2023, adhesive manufacturers can ensure that their products meet rigorous performance criteria, thereby supporting the broader goals of structural durability and safety in timber construction. Moreover, the exclusion of adhesives for on-site gluing, except under factory-like conditions, reinforces the document's focus on stringent quality control in manufacturing processes, ensuring that end products meet high standards for performance and reliability. The careful delineation of adhesive specifications in the context of defined environmental criteria is particularly significant for professionals in the industry, who must navigate the complexities of bonding processes and material behavior in various climatic conditions. Overall, EN 16254:2023 is an essential standard for both adhesive manufacturers and designers of load-bearing timber structures, providing a clear benchmark for quality and performance that is crucial for advancing the field of construction adhesives.
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