SIST EN 301:2023/oprA1:2025

Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification and performance requirements

This document establishes a classification for phenolic and aminoplastic polycondensation adhesives according to their suitability for use for load-bearing timber products in defined climatic exposure conditions, and specifies performance requirements for such adhesives for the factory manufacture or factory-like manufacturing conditions of load-bearing timber products only.
This document only specifies the performance of an adhesive for use in an environment corresponding to the defined conditions.
The performance requirements of this document are applicable to the adhesive only, not to the manufacturing 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. The requirements are applicable to the type testing of the adhesives. Production control activities are outside the scope of this document.
Adhesives meeting the requirements of this document are adequate for use in load-bearing timber products, provided that the bonding process has been carried out according to an appropriate product standard.

Klebstoffe, Phenoplaste und Aminoplaste, für tragende Holzbauteile - Klassifizierung und Leistungsanforderungen

Adhésifs de nature phénolique et aminoplaste, pour structures portantes en bois - Classification et exigences de performance

Lepila na osnovi fenolov in aminoplastov za nosilne lesene konstrukcije - Razvrstitev in zahtevane lastnosti - Dopolnilo A1

General Information

• Status: Not Published
• Public Enquiry End Date: 14-Dec-2025
• ICS: 83.180 - Adhesives
• ICS: 91.080.20 - Timber structures
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 28-Oct-2025
• Due Date: 17-Mar-2026
• Completion Date: 15-Dec-2025
• Ref Project: EN 301:2023/prA1 - Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification and performance requirements

Relations

• Amends: SIST EN 301:2023 - Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification and performance requirements
• Effective Date: 02-Jul-2025

Overview

EN 301:2023/prA1 - published by CEN - defines a classification and performance requirements for phenolic and aminoplastic polycondensation adhesives intended for load-bearing timber structures manufactured under factory or factory‑like conditions. The document covers adhesive performance in specified climatic exposure conditions and is focused on the adhesive itself (type testing), not on the finished timber product or on-site bonding processes.

Key topics and technical requirements

• Scope and applicability

  • Applies to phenolic and aminoplastic adhesives used in factory or factory‑like manufacture of load‑bearing timber (including solid wood panels).
  • Excludes on‑site gluing (except factory‑like), wood‑based panels (except solid wood panels), and modified/stabilized woods with greatly reduced swelling (e.g., acetylated, heat‑treated, polymer‑impregnated woods).
  • Requirements apply to the adhesive only; production control of timber products is outside scope.

• Classification

  • Adhesives are classified by suitability for defined climatic exposure conditions, enabling selection for different service environments in structural timber.

• Performance testing

  • Type testing is required to verify compliance; adhesives meeting EN 301 are acceptable for load‑bearing use provided bonding follows the relevant product standard.
  • Amendment prA1 introduces procedural clarifications:
    • Hardener dosage range: adhesive systems with variable hardener dosing must be tested at the lowest and highest mixing ratio.
    • Static load test (EN 302‑8): for six samples, no more than one may fail. Mean creep deformation limits after the test:
      • 0.05 mm for close‑contact glue lines (General purpose and Finger joint applications).
      • 0.5 mm for glue line thickness 1.0 mm (Gap filling applications).

• Standards referenced

  • Test method: EN 302‑8 (static load test) is explicitly referenced for creep performance.

Applications and users

• Primary audience:

  • Adhesive manufacturers performing type testing and product development.
  • Timber product manufacturers and engineers specifying adhesives for laminated beams, finger‑jointed members, glulam and other load‑bearing timber elements produced under factory conditions.
  • Certification bodies and laboratories conducting compliance testing.

• Practical uses:

  • Selecting adhesives based on climatic class and mechanical creep limits.
  • Defining test protocols during product qualification and supplier declarations.
  • Ensuring adhesives are suitable for factory-produced structural timber where long‑term load performance and environmental exposure are critical.

Related standards

• EN 301 is used alongside product standards for structural timber and test standards such as EN 302‑8. Users should consult relevant product standards to ensure the bonding process is compliant when using adhesives that meet EN 301:2023/prA1.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2025
Lepila na osnovi fenolov in aminoplastov za nosilne lesene konstrukcije -
Razvrstitev in zahtevane lastnosti - Dopolnilo A1
Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification
and performance requirements
Klebstoffe, Phenoplaste und Aminoplaste, für tragende Holzbauteile - Klassifizierung und
Leistungsanforderungen
Adhésifs de nature phénolique et aminoplaste, pour structures portantes en bois -
Classification et exigences de performance
Ta slovenski standard je istoveten z: EN 301:2023/prA1
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.

DRAFT
EUROPEAN STANDARD
EN 301:2023
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
October 2025
ICS 83.180
English Version
Adhesives, phenolic and aminoplastic, for load-bearing
timber structures - Classification and performance
requirements
Adhésifs de nature phénolique et aminoplaste, pour Klebstoffe, Phenoplaste und Aminoplaste, für tragende
structures portantes en bois - Classification et Holzbauteile - Klassifizierung und
exigences de performance Leistungsanforderungen
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 193.

This draft amendment A1, if approved, will modify the European Standard EN 301:2023. If this draft becomes an amendment,
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration.

This draft amendment was established by CEN 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.
Recipients of this draft are invited to submi
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