Adhesives for non-structural wood applications - Test method and requirements for resistance to static load

This European Standard specifies a method for determining the ability of a test piece bonded with a thermoplastic adhesive, to support a given load for a specified time without fracture or excessive distortion, and specifies performance requirements for mean survival time.
It should be used in conjunction with EN 204 and EN 205, which describe durability classes and corresponding test methods for non-structural wood adhesives based on their ability to withstand various water treatments and relatively rapidly applied loads. The test described in this standard may be used to assess joints made with thin glue line, as defined in EN 205.
NOTE   The test described in this standard is not a mandatory requirement for the classification of adhesives into the classes D1, D2, D3 and D4 given in EN 204. It is an additional test that can be specified by a purchaser if required.

Holzklebstoffe für nicht tragende Anwendungen - Prüfverfahren und Anforderungen an die Beständigkeit gegen statische Belastung

Diese Europäische Norm beschreibt ein Verfahren zur Bestimmung der Fähigkeit eines mit einem thermoplastischen Klebstoff geklebten Prüfkörpers, einer bestimmten Last über eine festgelegte Dauer ohne Bruch oder übermäßige Formänderung standzuhalten. Sie legt Anforderungen an die mittlere Haltbarkeits¬dauer der Klebung fest.
Dieses Verfahren sollte zusammen mit den Normen EN 204 und EN 205 angewendet werden, in denen die Beanspruchungsgruppen und die entsprechenden Prüfverfahren für Holzklebstoffe für nicht tragende Anwendungen auf Grundlage ihrer Fähigkeit beschrieben werden, verschiedenen Beanspruchungen durch Wasser und relativ rasch aufgebrachten Lasten standzuhalten. Die in dieser Norm beschriebene Prüfung kann zur Beurteilung dünner Klebstofffugen, die in EN 205 definiert werden, angewendet werden.
ANMERKUNG   Die in dieser Norm beschriebene Prüfung ist für eine Klassifizierung der Klebstoffe in die in EN 204 angegebenen Beanspruchungsgruppen D1, D2, D3 und D4 nicht zwingend erforderlich. Es handelt sich um eine zusätzliche Prüfung, die auf Wunsch des Bestellers festgelegt werden kann.

Adhésifs pour bois à usages non structuraux - Méthode d'essai et exigences pour la résistance à la charge statique

La présente Norme européenne décrit une méthode permettant de déterminer la capacité d’une éprouvette collée avec un adhésif thermoplastique, à résister à une charge donnée pendant une durée spécifiée sans se rompre ni se déformer exagérément et spécifie les exigences de performance pour une durée de vie moyenne.
Il convient d’utiliser la présente norme conjointement avec l’EN 204 et l’EN 205 qui décrivent les classes de durabilité et les méthodes d’essai correspondant aux adhésifs pour bois à usages non structuraux en se reposant sur la capacité de ces derniers à résister à différents traitements aqueux et aux charges appliquées rapidement. L’essai décrit dans la présente norme peut servir à évaluer les collages réalisés avec des joints minces définis dans l’EN 205.
NOTE   L’essai décrit dans la présente Norme ne constitue pas une exigence obligatoire pour le classement des adhésifs dans les classes DI, D2, D3 et D4 définies dans l’EN 204. Il s’agit d’un essai supplémentaire qui peut éventuellement être prescrit par un acheteur.

Lepila za nekonstrukcijsko uporabo - Preskusne metode in zahteve za odpornost proti statični obremenitvi

General Information

Status
Published
Publication Date
31-Jul-2007
Withdrawal Date
28-Feb-2008
ICS
83.180 - Adhesives
Technical Committee
CEN/TC 193 - Adhesives
Drafting Committee
CEN/TC 193/SC 1/WG 12 - Adhesives for non-loadbearing timber structures
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
12-Mar-2025
Completion Date
14-Apr-2025
Ref Project
SIST EN 14256:2007 - Adhesives for non-structural wood applications - Test method and requirements for resistance to static load

Overview

EN 14256:2007 is a European Standard developed by CEN that specifies a test method and performance requirements for the resistance to static load of adhesives used in non-structural wood applications. This standard focuses on evaluating how well a timber joint, bonded with a thermoplastic adhesive, can withstand a constant static load for an extended period without failure or excessive deformation. The standard is particularly useful for assessing thin glue line joints as defined in EN 205.

This method provides essential performance data to complement the durability classifications and test methods found in EN 204 and EN 205, which cover adhesive resistance to water treatments and rapidly applied loads. While EN 14256:2007 is not mandatory for classifying adhesives into durability classes D1 through D4, it serves as an additional test that purchasers can specify when higher confidence in static load resistance is required.

Key Topics

  • Scope and Purpose
    The standard evaluates the ability of bonded wood test pieces to support a static load of about 30 kg for up to 21 days, tracking joint survival time without fracture or excessive deformation.

  • Test Setup and Conditions

    • Use of jigs holding symmetrical single lap joints with overlapping wooden adherents.
    • Test pieces conditioned at (23 ± 2) °C and (50 ± 5) % relative humidity to ensure standard environment.
    • Continuous shear forcing by suspending weights for up to 21 days.
    • Daily inspection to record failure time or survival time for each test specimen.

  • Sample Preparation

    • Test pieces prepared with a thin glue line and specific dimensions, including a 20 mm overlap.
    • Adhesive application following manufacturer's instructions or defined parameters: adhesive spread around 150 g/m² per side, open assembly time approximately 120 s, closed assembly time about 180 s, and pressing pressure between 0.7 to 1.0 N/mm² for a minimum of 2 hours.
    • Conditioning bonded specimens for 7 to 8 days before testing.

  • Performance Criteria
    The mean survival time of the test pieces must be at least 14 days under the static load to meet the standard’s performance requirements.

  • Reporting Requirements
    The test report includes detailed information about the adhesive type, wood species and moisture content, bonding procedure, conditioning method, survival times of specimens, and any deviations from the standard procedures.

Applications

EN 14256:2007 is used extensively by:

  • Adhesive manufacturers to validate and demonstrate the static load performance of thermoplastic adhesives for wood.
  • Wood product manufacturers engaged in non-structural woodworking-such as furniture, interior joinery, and decorative elements-where resistant bonded joints to static loads are critical.
  • Quality control and R&D teams assessing adhesive formulations for optimal load-bearing resistance in non-structural joints.
  • Purchasers and specifiers requiring enhanced assurance of static load performance beyond durability classifications specified in EN 204.

This standard is instrumental in guiding selections of adhesives where joints must maintain integrity under continuous loading conditions, preventing failures that can compromise product quality and safety over time.

Related Standards

  • EN 204: Classification of Thermoplastic Wood Adhesives – Defines durability classes (D1-D4) for non-structural adhesives based on resistance to water exposure and stress.
  • EN 205: Determination of Tensile Shear Strength of Lap Joints – Describes test methods for evaluating adhesive strength in wood joints, including glue line thickness and construction details.
  • EN 923: Adhesives - Terms and Definitions – Provides standardized terminology essential for consistent application and interpretation of adhesive testing standards.
  • EN 13183-1 and EN 13183-2: Moisture Content of Sawn Timber – Specify oven-dry and electrical resistance methods to measure wood moisture content, a key parameter affecting adhesion quality.

By combining EN 14256:2007 with these related standards, stakeholders establish a comprehensive framework for assessing, certifying, and applying adhesives in non-structural wood applications, ensuring safety, durability, and quality compliance across European markets.

Keywords: EN 14256:2007, adhesives for wood, non-structural wood adhesives, static load resistance test, thermoplastic adhesives, wood bonding test method, load-bearing wood joints, adhesive durability, EN 204, EN 205, wood adhesive performance

Frequently Asked Questions

EN 14256:2007 is a standard published by the European Committee for Standardization (CEN). Its full title is "Adhesives for non-structural wood applications - Test method and requirements for resistance to static load". This standard covers: This European Standard specifies a method for determining the ability of a test piece bonded with a thermoplastic adhesive, to support a given load for a specified time without fracture or excessive distortion, and specifies performance requirements for mean survival time. It should be used in conjunction with EN 204 and EN 205, which describe durability classes and corresponding test methods for non-structural wood adhesives based on their ability to withstand various water treatments and relatively rapidly applied loads. The test described in this standard may be used to assess joints made with thin glue line, as defined in EN 205. NOTE The test described in this standard is not a mandatory requirement for the classification of adhesives into the classes D1, D2, D3 and D4 given in EN 204. It is an additional test that can be specified by a purchaser if required.

This European Standard specifies a method for determining the ability of a test piece bonded with a thermoplastic adhesive, to support a given load for a specified time without fracture or excessive distortion, and specifies performance requirements for mean survival time. It should be used in conjunction with EN 204 and EN 205, which describe durability classes and corresponding test methods for non-structural wood adhesives based on their ability to withstand various water treatments and relatively rapidly applied loads. The test described in this standard may be used to assess joints made with thin glue line, as defined in EN 205. NOTE The test described in this standard is not a mandatory requirement for the classification of adhesives into the classes D1, D2, D3 and D4 given in EN 204. It is an additional test that can be specified by a purchaser if required.

EN 14256:2007 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 14256:2007 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Adhesives for non-structural wood applications - Test method and requirements for resistance to static loadAdhésifs pour bois a usages non structuraux - Méthode d'essai et exigences pour la résistance a la charge statiqueHolzklebstoffe für nicht tragende Anwendungen - Prüfverfahren und Anforderungen an die Beständigkeit gegen statische BelastungTa slovenski standard je istoveten z:EN 14256:2007SIST EN 14256:2007en,fr,de83.180LepilaAdhesivesICS:SLOVENSKI
STANDARDSIST EN 14256:200701-november-2007

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14256August 2007ICS 83.180 English VersionAdhesives for non-structural wood applications - Test methodand requirements for resistance to static loadAdhésifs pour bois à usages non structuraux - Méthoded'essai et exigences pour la résistance à la charge statiqueHolzklebstoffe für nicht tragende Anwendungen -Prüfverfahren und Anforderungen an die Beständigkeitgegen statische BelastungThis European Standard was approved by CEN on 23 June 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14256:2007: E
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