EN 302-3:2023
(Main)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
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
This document specifies a method for determining the effect on bond strength of damage to wood fibres caused by the action of acids from the adhesive or primer used in the gluing process during climatic cycling.
It is applicable to the following applications:
a) for assessing the compliance of adhesives with EN 301, EN 15425 and EN 16254;
b) for assessing the suitability and quality of adhesives for load-bearing timber structures;
c) for determining if the adhesive after bonding has a damaging influence on the strength of the wood due to chemical action.
This test is intended primarily to obtain performance data for the classification of adhesives for load-bearing timber structures according to their suitability for use in defined climatic environments. This test is carried out on Norway spruce (Picea abies L.) or Beech (Fagus sylvatica L.).
This method is not intended to provide data for structural design and does not necessarily represent the performance of the bonded member in service.
Klebstoffe für tragende Holzbauteile - Prüfverfahren - Teil 3: Bestimmung des Einflusses von Säureschädigung der Holzfasern durch Temperatur- und Feuchtezyklen auf die Querzugfestigkeit
Dieses Dokument legt ein Verfahren zur Bestimmung des Einflusses von Holzfaserschädigung auf die Klebfugenfestigkeit, verursacht durch die Wirkung von Säuren des Klebstoffs oder eines im Klebprozess eingesetzten Haftvermittlers (Primer) während einer zyklischen Klimabeanspruchung, fest.
Es ist für folgende Anwendungsfälle anwendbar:
a) zur Beurteilung der Übereinstimmung von Klebstoffen mit EN 301, EN 15425 und EN 16254;
b) zur Beurteilung der Eignung und Qualität von Klebstoffen für tragende Holzbauteile;
c) zur Feststellung, ob der Klebstoff nach der Verklebung infolge chemischer Vorgänge einen schädigenden Einfluss auf die Holzfestigkeit hat.
Diese Prüfung ist hauptsächlich dafür vorgesehen, Leistungsdaten für die Klassifizierung von Klebstoffen für tragende Holzbauteile entsprechend ihrer Eignung zur Verwendung in festgelegten klimatischen Umgebungen zu erhalten. Diese Prüfung wird mit Fichte (Picea abies L.) oder Buche (Fagus sylvatica L.) durchgeführt.
Dieses Verfahren ist nicht dafür vorgesehen, Bemessungswerte bereitzustellen, und gibt nicht zwangsläufig die Leistungsfähigkeit des verklebten Bauteiles im Gebrauch wieder.
Adhésifs pour structures portantes en bois - Méthodes d’essai - Partie 3 : Détermination de l’influence de l’attaque d’acide des fibres de bois, résultant de traitements cycliques en température et humidité sur la résistance à la traction transversale
Le présent document spécifie une méthode qui permet de déterminer l’influence sur la résistance à la rupture d’un joint, de l’attaque des fibres de bois par l’action d’acides contenus dans l’adhésif ou un primaire utilisé lors du processus de collage, pendant des cycles climatiques.
Cette méthode s’applique dans les cas suivants :
a) évaluation de la conformité des adhésifs à l’EN 301, l’EN 15425 et l’EN 16254 ;
b) évaluation de l’aptitude à l’emploi et de la qualité des adhésifs pour les structures portantes en bois ;
c) détermination de l’éventuelle influence dommageable d’une action chimique de l’adhésif après collage sur la résistance du bois.
Cet essai vise principalement à obtenir des données de performance en vue de la classification des adhésifs pour structures portantes en bois en fonction de leur aptitude à l’utilisation dans des environnements climatiques définis. Cet essai est réalisé sur de l’épicéa de Norvège (Picea abies L.) ou du hêtre (Fagus sylvatica L.).
Cette méthode n’est pas destinée à fournir des données pour le calcul des structures et ne représente pas nécessairement les performances en service de l’élément collé.
Lepila za nosilne lesene konstrukcije - Preskusne metode - 3. del: Ugotavljanje vpliva kislinskih poškodb lesnih vlaken, nastalih zaradi cikličnih obremenitev s temperaturo in vlago, na prečno natezno trdnost
Ta dokument določa metodo za ugotavljanje vpliva poškodb lesnih vlaken na sprijemno trdnost, ki nastanejo zaradi delovanja kislin iz lepila ali premaza, uporabljenega pri postopku lepljenja, med podnebno obremenitvijo.
Metoda se uporablja:
a) za oceno skladnosti lepil s standardi EN 301, EN 15425 in EN 16254;
b) za oceno ustreznosti in kakovosti lepil za nosilne lesene konstrukcije;
c) ugotavljanje, ali ima lepilo po sprijemanju škodljiv vpliv na trdnost lesa zaradi delovanja kemikalij.
Ta preskus je namenjen zlasti pridobivanju podatkov o lastnostih za razvrstitev lepil za nosilne lesene konstrukcije glede na njihovo ustreznost za uporabo v opredeljenih podnebnih okoljih. Pri tem poskusu se uporablja norveška smreka (Picea abies L.) ali bukev (Fagus sylvatica L.).
Ta metoda ni namenjena za zagotavljanje številčnih podatkov o zasnovi, pri čemer ne predstavlja nujno lastnosti zlepljenega elementa v uporabi.
General Information
- Status
- Published
- Publication Date
- 14-Feb-2023
- Technical Committee
- CEN/TC 193 - Adhesives
- Drafting Committee
- CEN/TC 193/SC 1/WG 8 - Revision of EN 301 and EN 302
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 15-Feb-2023
- Due Date
- 26-Sep-2023
- Completion Date
- 15-Feb-2023
Relations
- Effective Date
- 19-Jan-2023
Overview
EN 302-3:2023 is a European standard developed by CEN that specifies a test method to determine the effect of acid damage on wood fibers caused by adhesives or primers used in load-bearing timber structures. This damage results from chemical action during temperature and humidity cycling, which can influence the transverse tensile strength of the wood-adhesive bond. The standard focuses on assessing how acid release from adhesives impacts the bond integrity, particularly for timber species like Norway spruce (Picea abies L.) and Beech (Fagus sylvatica L.).
This testing method supports the classification and performance evaluation of adhesives used in structural timber applications under varying climatic conditions. Although primarily intended to provide performance data for adhesive classification, EN 302-3:2023 is not designed for direct structural design calculations nor does it predict the long-term in-service performance of bonded timber members.
Key Topics
Purpose and Scope
Specifies a method to evaluate bond strength degradation due to acid-induced damage under climatic cycling involving temperature and humidity variations.Applicable Timber and Adhesives
Testing uses Norway spruce or Beech wood samples. It is applicable for adhesives complying with EN 301, EN 15425, and EN 16254 standards, representing phenolic, aminoplastic, and polyurethane adhesives respectively.Test Procedure
- Preparation of wood samples with precise dimensions and moisture content (12% ± 1%)
- Bonded assemblies using specified glue line thicknesses and spacers (ranging from 0.1 mm to 2.0 mm)
- Climatic cycling in controlled conditions simulating relevant industrial environments:
- 10 ± 2 °C at 87.5% RH
- 50 ± 2 °C at 87.5% RH
- 50 ± 2 °C with RH below 20%
- Measurement of transverse tensile strength after cycling using constant rate loading machines
Performance Data for Classification
The test results assist in determining the chemical impact from adhesives on wood fibers, contributing to adhesive suitability classification for load-bearing timber structures in defined climates.Standards Referenced
Key normative references include EN 301, EN 15425, EN 16254 for adhesives classification, EN 923 for adhesive terminology, EN 384 for timber properties, and ISO 5893 for test equipment specifications.
Applications
Adhesive Quality Assurance
EN 302-3:2023 is essential for manufacturers and quality controllers to verify adhesive performance, ensuring no harmful acid damage occurs during service life.Structural Timber Engineering
Engineers and designers use the adhesive classification supported by this test to select adhesives compatible with climatic demands typical in different regions, thus improving safety and durability of timber structures.Product Development
Adhesive developers can use this standard to benchmark new formulations against acid damage criteria, facilitating innovation and compliance with Eurocode 5 related standards.Regulatory Compliance
The standard aids compliance with European requirements, enabling harmonized assessment of adhesive products across CEN member countries.
Related Standards
- EN 301 – Phenolic and aminoplastic adhesives classification and performance for load-bearing timber
- EN 15425 – One component polyurethane adhesives classification and performance
- EN 16254 – Emulsion polymer isocyanate adhesives classification and performance
- EN 17334 – Testing and classification of glued-in rods in glued structural timber products
- EN 17418 – Two-component epoxy and polyurethane adhesives for on-site repair of cracked timber
- EN 302 series – Comprehensive test methods for adhesives, including longitudinal tensile shear strength (Part 1), resistance to delamination (Part 2), and other bond performance aspects
Summary
EN 302-3:2023 delivers a reliable and standardized method to evaluate how adhesive-induced acid damage under cyclic climatic conditions affects the transverse tensile strength of timber bonds. It is a critical reference for professionals engaged in the manufacturing, testing, and application of adhesives in structural timber construction, facilitating enhanced durability and safety in load-bearing wood structures. The standard aligns with key adhesives classification norms and complements the Eurocode 5 framework for timber design, underpinning sustainable and high-performance timber construction practices in Europe and beyond.
Keywords: EN 302-3:2023, adhesives, load-bearing timber structures, acid damage, wood fibers, transverse tensile strength, temperature cycling, humidity cycling, timber adhesives testing, Norway spruce, Beech wood, adhesive classification, EN 301, EN 15425, EN 16254, structural timber, climatic conditions, Eurocode 5.
Frequently Asked Questions
EN 302-3:2023 is a standard published by the European Committee for Standardization (CEN). Its full title is "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". This standard covers: This document specifies a method for determining the effect on bond strength of damage to wood fibres caused by the action of acids from the adhesive or primer used in the gluing process during climatic cycling. It is applicable to the following applications: a) for assessing the compliance of adhesives with EN 301, EN 15425 and EN 16254; b) for assessing the suitability and quality of adhesives for load-bearing timber structures; c) for determining if the adhesive after bonding has a damaging influence on the strength of the wood due to chemical action. This test is intended primarily to obtain performance data for the classification of adhesives for load-bearing timber structures according to their suitability for use in defined climatic environments. This test is carried out on Norway spruce (Picea abies L.) or Beech (Fagus sylvatica L.). This method is not intended to provide data for structural design and does not necessarily represent the performance of the bonded member in service.
This document specifies a method for determining the effect on bond strength of damage to wood fibres caused by the action of acids from the adhesive or primer used in the gluing process during climatic cycling. It is applicable to the following applications: a) for assessing the compliance of adhesives with EN 301, EN 15425 and EN 16254; b) for assessing the suitability and quality of adhesives for load-bearing timber structures; c) for determining if the adhesive after bonding has a damaging influence on the strength of the wood due to chemical action. This test is intended primarily to obtain performance data for the classification of adhesives for load-bearing timber structures according to their suitability for use in defined climatic environments. This test is carried out on Norway spruce (Picea abies L.) or Beech (Fagus sylvatica L.). This method is not intended to provide data for structural design and does not necessarily represent the performance of the bonded member in service.
EN 302-3:2023 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 302-3:2023 has the following relationships with other standards: It is inter standard links to EN 302-3:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN 302-3:2023 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 za nosilne lesene konstrukcije - Preskusne metode - 3. del: Ugotavljanje
vpliva kislinskih poškodb lesnih vlaken, nastalih zaradi cikličnih obremenitev s
temperaturo in vlago, na prečno natezno trdnost
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
Klebstoffe für tragende Holzbauteile - Prüfverfahren - Teil 3: Bestimmung des Einflusses
von Säureschädigung der Holzfasern durch Temperatur- und Feuchtezyklen auf die
Querzugfestigkeit
Adhésifs pour structures portantes en bois - Méthodes d’essai - Partie 3 : Détermination
de l’influence de l’attaque d’acide des fibres de bois, résultant de traitements cycliques
en température et humidité sur la résistance à la traction transversale
Ta slovenski standard je istoveten z: EN 302-3:2023
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 302-3
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2023
EUROPÄISCHE NORM
ICS 83.180 Supersedes EN 302-3:2017
English Version
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
Adhésifs pour structures portantes en bois - Méthodes Klebstoffe für tragende Holzbauteile - Prüfverfahren -
d'essai - Partie 3 : Détermination de l'influence de Teil 3: Bestimmung des Einflusses von
l'attaque d'acide des fibres de bois, résultant de Säureschädigung der Holzfasern durch Temperatur-
traitements cycliques en température et humidité sur und Feuchtezyklen auf die Querzugfestigkeit
la résistance à la traction transversale
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 302-3:2023 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 Symbols . 7
5 Principle . 7
6 Apparatus . 7
7 Method . 7
7.1 Selection of timber . 7
7.2 Preparation of the bonded assemblies . 8
7.3 Preparation of the test pieces . 9
7.4 Number of test pieces .10
7.5 Climatic and cyclic storage conditions .10
7.6 Test procedure .10
8 Expression of results .11
9 Test report .11
9.1 The adhesive .11
9.2 Preparation of test pieces and testing procedures .11
9.3 Test results .12
European foreword
This document (EN 302-3:2023) 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 302-3:2017.
The main changes compared to the previous edition are listed below:
a) two new standards, EN 17334 and EN 17418, have been included in the list of standards in the
Introduction;
b) two new Clauses (Terms and definitions and Symbols) have been introduced.
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, EN 302-8,
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 standard can have a negative environmental
impact. As technological advantages lead to better alternatives for these materials, they will be eliminated
from this document to the greatest extent possible.
At the end of the test, it is recommended that the users of the standard take care to carry out an
appropriate disposal of the wastes, according to local regulations.
1 Scope
This document specifies a method for determining the effect on bond strength of damage to wood fibres
caused by the action of acids from the adhesive or primer used in the gluing process during climatic
cycling.
It is applicable to the following applications:
a) for assessing the compliance of adhesives with EN 301, EN 15425 and EN 16254;
b) for assessing the suitability and quality of adhesives for load-bearing timber structures;
c) for determining if the adhesive after bonding has a damaging influence on the strength of the wood
due to chemical action.
This test is intended primarily to obtain performance data for the classification of adhesives for load-
bearing timber structures according to their suitability for use in defined climatic environments. This test
is carried out on Norway spruce (Picea abies L.) or Beech (Fagus sylvatica L.).
This method is not intended to provide data for structural design and does not necessarily represent the
performance of the bonded member in service.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes require
...
The EN 302-3:2023 standard provides a comprehensive methodology for evaluating the impact of acid damage on wood fibers, particularly concerning adhesives for load-bearing timber structures. The scope of this document is focused on determining how the bond strength of adhesives can be affected by acidic substances that may emanate from the adhesives or primers used during the bonding process. This focus highlights the essential relationship between adhesive performance and the longevity and safety of timber structures, especially under varying climatic conditions. One of the key strengths of this standard is its rigorous testing framework, which not only assesses adherence to other relevant standards, such as EN 301, EN 15425, and EN 16254, but also evaluates the overall suitability and quality of adhesives. By employing Norway spruce and Beech wood specimens, the standard ensures that the results are relevant for widely used timber species in construction, enhancing the applicability of the findings. Moreover, the testing methodology outlined in EN 302-3:2023 enables the classification of adhesives based on their performance in specified climatic environments. This is crucial for professionals in the field, as it provides empirical data that can influence adhesive selection for specific applications in load-bearing timber structures. However, it is important to note that while this standard is invaluable for assessing the durability of adhesives, it is not designed for structural design, nor does it predict the performance of bonded timber members in real-world service conditions. Overall, the EN 302-3:2023 standard serves as a critical resource for ensuring the integrity and longevity of load-bearing timber structures, making it highly relevant in the realm of construction and adhesive technology. The thorough examination of acid damage and its effects on bond strength solidifies its role in the quality assurance processes for adhesive products in the industry.
SIST EN 302-3:2023は、負荷を支える木構造用接着剤に関する重要な標準であり、接着プロセスにおける酸の影響を木質ファイバーに与える温度や湿度の変動に対する試験方法を定めています。この標準は、接着剤の性能を評価するための方法を提供し、具体的には接着剤がEN 301、EN 15425、およびEN 16254に準拠しているかどうかを判断するための基準を含んでいます。 この文書の強みは、その適用範囲の広さにあります。接着剤の適合性や品質を評価し、荷重を支える木構造におけるセキュリティを確保するための基準を提供します。また、接着後に接着剤が化学的な作用によって木材の強度に悪影響を与えるかどうかを検証することができ、建築現場における耐久性の観点からも非常に重要です。 加えて、試験対象としてノルウェースプルース（Picea abies L.）やブナ（Fagus sylvatica L.）を使用することで、標準が持つ実用的な価値が向上しています。このように、特定の気候環境での使用に適した接着剤の分類に必要なパフォーマンスデータを得ることができ、さらに、構造設計のためのデータを提供することを目的としていないため、データの信頼性は保たれています。 SIST EN 302-3:2023は、接着剤の評価と適合性確認に関する基準としての役割を果たし、負荷を支える木構造の設計や建設において、持続可能性を向上させるために不可欠な文書です。これにより、実際のサービス条件における接着部材の性能を理解し、質の高い構造体の実現に貢献することが期待されます。
La norme SIST EN 302-3:2023 est un document essentiel pour l'évaluation des colles utilisées dans les structures en bois portantes. Son champ d'application se concentre sur la détermination de l'effet des dommages causés aux fibres de bois par des acides provenant de la colle ou du primaire lors du processus de collage, en particulier par des cycles de température et d'humidité. Cette norme présente plusieurs forces. Tout d'abord, elle permet d'évaluer la conformité des adhésifs selon les normes EN 301, EN 15425 et EN 16254, garantissant ainsi que les produits respectent des critères de qualité et de sécurité rigoureux. De plus, elle offre une méthode précise pour tester la capacité des adhésifs à maintenir la résistance des structures en bois contre l'influence potentiellement dommageable de l'acide, ce qui est crucial pour la durabilité et la fiabilité de ces constructions. La pertinence de cette norme est évidente dans le contexte des constructions en bois modernes, où la résistance et la qualité des matériaux sont primordiales. En spécifiant que les tests doivent être réalisés sur du sapin norvégien (Picea abies L.) ou du hêtre (Fagus sylvatica L.), la norme assure une évaluation adaptée aux espèces de bois couramment utilisées dans le secteur. Toutefois, il est important de noter que cette méthode n'est pas conçue pour fournir des données pour la conception structurale et ne représente pas nécessairement la performance des éléments collés en service, ce qui doit être pris en compte lors de son application. En résumé, la norme SIST EN 302-3:2023 est un outil crucial pour les professionnels de l'industrie du bois, permettant d'assurer la qualité et la sécurité des adhésifs dans les structures en bois portantes, tout en offrant un cadre d'évaluation clair et spécifique pour les conditions climatiques définies.
Die Norm EN 302-3:2023 bietet eine umfassende Methodik zur Bewertung der Auswirkungen von Säureschäden an Holzfasern auf die transversale Zugfestigkeit von Klebstoffen, die in tragenden Holzstrukturen verwendet werden. Der Fokus der Norm liegt auf der Bestimmung der Bondfestigkeit, die durch die chemische Wirkung von Klebstoffen oder Primern während klimatischer Zyklen beeinträchtigt wird. Ein bedeutender Stärke dieser Norm liegt in ihrer Anwendbarkeit auf verschiedene Klebstoffe, die den europäischen Normen EN 301, EN 15425 und EN 16254 entsprechen. Dadurch ermöglicht sie eine standardisierte Bewertung der Eignung und Qualität von Klebstoffen, die in tragenden Holzstrukturen eingesetzt werden. Die Klarheit der Testmethode unterstützt Produzenten sowie Anwender dabei, die Leistungsfähigkeit von Klebstoffen in Bezug auf unterschiedliche klimatische Bedingungen zu bewerten. Ein weiterer wichtiger Aspekt der Norm ist die spezifische Prüfung an Holzarten wie Fichte (Picea abies L.) und Buche (Fagus sylvatica L.), was die Relevanz und Anwendbarkeit in relevanten Konstruktionskontexten erhöht. Trotz ihrer spezifischen Zielsetzungen schränkt die Norm nicht die Möglichkeit ein, wertvolle Daten für die Klassifikation von Klebstoffen zu generieren, was insbesondere für Ingenieure bei der Auswahl von Materialien in der Planung von Holzbauprojekten von Bedeutung ist. Insgesamt stellt die EN 302-3:2023 eine essentielle Ressource dar, um die Auswirkungen von chemischen Einflüssen auf die strukturelle Integrität von Holzverbindungen zu verstehen und zu klassifizieren. Ihre methodische Grundlage fördert die Entwicklung sicherer und leistungsfähiger Klebstoffe für tragende Holzstrukturen, was sie zu einem relevanten Dokument in der Bauindustrie macht.
표준 EN 302-3:2023은 하중을 지지하는 목재 구조물용 접착제의 품질과 성능을 평가하는 데 매우 중요한 문서입니다. 이 표준의 범위는 특정 환경에서의 접착제의 내구성을 평가하는 방법을 명확히 규정하므로, 관련 분야에서도 필수적인 자료로 인식되고 있습니다. 이 표준에서는 산으로 인한 목재 섬유 손상이 접착 강도에 미치는 영향을 온도 및 습도 사이클링을 통해 측정하는 방법을 명시하고 있습니다. 이는 특히 접착제가 하중을 지지하는 목재 구조물에 적합한지를 판단하는 데 있어 중요한 역할을 합니다. 표준은 EN 301, EN 15425, EN 16254와의 일치를 평가하는데 필요한 실질적 데이터를 제공하며, 접착제가 화학 작용으로 인해 목재의 강도에 악영향을 미치는지 여부를 판단할 수 있게 합니다. 또한, 이 표준은 노르웨이 전나무(Picea abies L.)와 자작나무(Fagus sylvatica L.)를 사용하여 실험을 수행하도록 되어 있어, 구체적이고 재현 가능한 결과를 제공하게끔 설계되었습니다. 이러한 접근법은 하중을 지지하는 목재 구조물에 사용될 접착제가 특정 기후 환경에서 얼마나 효과적인지를 평가하는 데 있어 신뢰성을 보장합니다. EN 302-3:2023의 강점 중 하나는 다양한 접착제의 적합성과 품질을 종합적으로 평가할 수 있는 체계적인 방법론을 제공한다는 점입니다. 이는 건축 및 엔지니어링 분야에서 하중을 지지하는 목재 구조물의 안전성과 내구성을 보장하기 위해 필수적입니다. 표준에 따른 검증은 구조적 설계에 직접적으로 연관되지는 않지만, 접착제의 성능을 신뢰할 수 있는 기준으로 정립하도록 돕습니다. 결론적으로, EN 302-3:2023은 하중을 지지하는 목재 구조물의 안전성을 확보하기 위한 필수적인 기준으로서, 접착제의 성능을 평가하고 표준에 맞는 사용 가능성을 판별하는 데 중대한 기여를 하고 있습니다.
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