CEN/TC 193/SC 1/WG 8 - Revision of EN 301 and EN 302

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 laboratory method of determining the maximum assembly time at two spread rate levels in standard atmosphere [20/65].
This document is applicable to obtaining a reliable base of comparison of the maximum assembly time between adhesives at referenced conditions.

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.

This European Standard establishes a classification for phenolic and aminoplastic polycondensation adhesives according to their suitability for use for load-bearing timber structures 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 structures only.
This European Standard only specifies the performance of an adhesive for use in an environment corresponding to the defined conditions.
The performance requirements of this European Standard apply to the adhesive only, not to the timber structure. This European Standard does not cover the performance of adhesives for on-site gluing (except for factory-like conditions) nor the production of wood-based panels, except solid wood panels, or modified and stabilized wood with considerably reduced swelling and shrinkage properties, e.g. such as acetylated wood, heat treated wood and polymer impregnated wood.
This European Standard is primarily intended for the use of adhesive manufacturers and for the use in timber structures bonded with adhesives, to assess or control the quality of adhesives. The requirements apply to the type testing of the adhesives. Production control activities are outside the scope of this European Standard.
Adhesives meeting the requirements of this European Standard are adequate for use in a load-bearing timber structure, provided that the bonding process has been carried out according to an appropriate product standard.

This European Standard specifies a laboratory method of determining the maximum assembly time at two spread rate levels in standard atmosphere [20/65].
This European Standard is intended for obtaining a reliable base of comparison of the maximum assembly time between adhesives at referenced conditions.

This European Standard establishes a classification for phenolic and aminoplastic polycondensation adhesives according to their suitability for use for load-bearing timber structures 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 structures only.
This European Standard only specifies the performance of an adhesive for use in an environment corresponding to the defined conditions.
The performance requirements of this European Standard apply to the adhesive only, not to the timber structure. This European Standard does not cover the performance of adhesives for on-site gluing (except for factory-like conditions) nor the production of wood-based panels, except solid wood panels, or modified and stabilised wood with considerably reduced swelling and shrinkage properties, e.g. such as acetylated wood, heat treated wood and polymer impregnated wood.
This European Standard is primarily intended for the use of adhesive manufacturers and for the use in timber structures bonded with adhesives, to assess or control the quality of adhesives. The requirements apply to the type testing of the adhesives. Production control activities are outside the scope of this European Standard.
Adhesives meeting the requirements of this European Standard are adequate for use in a load-bearing timber structure, provided that the bonding process has been carried out according to an appropriate product standard.

This European Standard establishes a classification for phenolic and aminoplastic polycondensation adhesives according to their suitability for use for load-bearing timber structures in defined climatic exposure conditions, and specifies performance requirements for such adhesives for the manufacture of load-bearing timber structures only.
The performance requirements of this standard apply to the adhesive only, not to the structure. This standard does not primarily cover the performance of adhesives for the production of wood-based panels.
This standard is primarily intended for the use of adhesive manufacturers and for the use in timber structures bonded with adhesives, to assess or control the quality of adhesives. This standard 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 standard for its type is adequate for use in a load-bearing structure, provided that the bonding process has been carried out according to an appropriate product standard.

This Part of EN 302 specifies a method for determining the effect on bond strength of damage to wood fibres caused by the action of acids from the adhesive during climatic cycling.
It is suitable for the following applications:
a) assessing the compliance of adhesives with EN 301;
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 spruce (Picea abies L.).
This method is intended for use to provide numerical design data and does not necessarily represent the performance of the bonded member in service. It is not intended to be used to assess the suitability of adhesives for the manufacture of wood-based panels.
NOTE   Attention is drawn to the fact that the performance requirement established in prEN 301 for the acid fibre damage test applies only if either:
1) the adhesive mixture, or
2) one of the adhesive components, when applied separately,
shows a pH value lower than 4,0, as determined by EN 1245.

This part of EN 302 specifies a method for determining the extent to which wood shrinkage under drying conditions will weaken an adhesive bond.
It is suitable for the following applications:
a) for assessing the compliance of adhesives with EN 301;
b) for assessing the suitability and quality of adhesives for load-bearing timber structures;
c) for determining if the adhesive is capable of withstanding stresses due to wood shrinkage without unacceptable loss of strength.
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 spruce (Picea abies L.).
This method is not intended for use to provide numerical design data and does not necessarily represent the performance of the bonded member in service. It is not intended to be used to assess the suitability of adhesives for the manufacture of wood-based panels.

This part of EN 302 specifies a method for determining the conventional working life for adhesives for load-bearing timber structures, by a viscosity test.
This method is not suitable for determining the conventional working life of a multi-component adhesive whose actual working life is very short.
This standard is only intended for obtaining a reliable basis for comparison between adhesives. The method gives results which cannot be applied to the safe manufacture of timber structures without modifications for the influences of factory temperature and relative air humidity.

This Part of EN 302 specifies a method for determining the effect on bond strength of damage to wood fibres caused by the action of acids from the adhesive during climatic cycling.
It is suitable for the following applications:
a) assessing the compliance of adhesives with EN 301;
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 spruce (Picea abies L.).
This method is intended for use to provide numerical design data and does not necessarily represent the performance of the bonded member in service. It is not intended to be used to assess the suitability of adhesives for the manufacture of wood-based panels.
NOTE   Attention is drawn to the fact that the performance requirement established in EN 301 for the acid fibre damage test applies only if either:
1) the adhesive mixture, or
2) one of the adhesive components, when applied separately,
shows a pH value lower than 4,0, as determined by EN 1245.

This part of EN 302 specifies a method for determining the resistance to delamination of bonded joints.
It is suitable for the following applications:
a) for assessing the compliance of adhesives with EN 301;
b) for assessing the suitability and quality of adhesives for load-bearing timber structures;
c) for comparing the effects on the bond strength resulting from the choice of bonding conditions, from different climatic conditioning and from the treatment of the test pieces before and after bonding.
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 method is not intended for use to provide numerical design data and does not necessarily represent the performance of the bonded member in service. It is not intended to be used to assess the suitability of adhesives for the manufacture of wood-based panels.

This part of EN 302 specifies a method for determining the conventional pressing time at three temperatures for adhesives for load-bearing timber structures.
This standard is only intended for obtaining a reliable basis for comparison of conventional pressing time between adhesives. The method gives results which cannot be applied to the safe manufacture of timber structures without modifications for the influences of timber density/absorbency, moisture content, factory temperature and relative air humidity.

This part of EN 302 specifies a method of determining the shear strength of adhesive bonds. It is applicable to adhesives used in load-bearing timber structures.
This method is not intended for use to provide numerical design data, nor is it applicable to the assessment of adhesives for the manufacture of wood-based panels.

This European standard establishes a classification for phenolic and aminoplastic polycondensation adhesives according to their suitability for use for load bearing timber structures in defined climatic exposure conditions, and specifies performance requirements for such adhesives for the manufacture of load-bearing timber structures only. The performance requirements of this standard apply to the adhesive only, not to the structure.

This Part of EN 302 describes a method for determining the extent to which wood shrinkage under drying conditions will weaken an adhesive bond. It is suitable for the following applications: a) for assessing the compliance of adhesives with EN 301; b) for assessing the usability and quality of adhesives for load-bearing timber structures; c) for establishing whether or not the adhesive is capable of withstanding stresses due to shrinkage of the wood, without unacceptable loss of strength.

This Part of EN 302 describes a method of determining the effect on bond strength of damage to wood fibres caused by the action of acids from the adhesive during climatic cycling. It is suitable for the following applications:  a) for assessing the compliance of adhesives with EN 301; b) for assessing the usability and quality of adhesives for wood and 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 part of EN 302 describes a method of determining the strength in longitudinal shear of adhesive bonds between lap joint test pieces made of beech (fagus sylvatica). It is suitable for the following applications: a) for assessing the compliance of adhesives with EN 301; b) for assessing the suitability and quality of adhesives for load-bearing timber structures; c) for comparing the strengths of bond with thin or thick gluelines.

This part of EN 302 describes a method for determining the resistance to delamination of adhesively bonded joints. It is suitable for the following applications: a) for assessing the compliance of adhesives with EN 301; b) for assessing the suitability and quality of adhesives for load bearing timber structures; c) for comparing the effects on the bond strength resulting from the choice of bonding conditions, from different climatic conditioning and from the treatment of the test pieces before and after bonding.

This European Prestandard specifies a laboratory method of determining the conventional assembly time for adhesives for load bearing timber structures under specified conditions.
This test method is not intended for use with adhesive systems in which the components are separately and sequentially applied to the substrate.
This prestandard is only intended for obtaining a reliable base of comparison between similar adhesives. The method gives result which cannot be applied to the safe manufacture of timber structures without modifications for the influences of timber density/absorbency, moisture content, factory temperature and relative air humidity.