Chemie a potravinářství

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 2.11.2021
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This document specifies a method for determining the working life for adhesives mixed with hardener for load-bearing timber structures, by a viscosity test.

This method is not suitable for determining the working life of a multi-component adhesive whose actual working life is very short.

This document 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.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 2.11.2021
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This document specifies a method for determining the resistance to delamination in glue lines.

It is suitable for the following applications:

a)    for assessing the compliance of adhesives with EN 301, EN 15425, EN 16254, EN 17334 and EN 17418;

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 not applicable for modified and stabilized wood with strongly reduced swelling and shrinkage properties, such as acetylated wood, heat-treated wood and polymer impregnated wood.

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 to provide data for structural design and does not necessarily represent the performance of the bonded member in service.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 2.11.2021
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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 intended for obtaining a reliable base of comparison of the maximum assembly time between adhesives at referenced conditions.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 2.11.2021
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This document specifies a method for determining the influence of shear strength in crosswise gluing by wood shrinkage under drying conditions.

It is suitable for the following applications:

a)    for assessing the compliance of adhesives with EN 301, EN 15425, EN 16254, EN 17334 and EN 17418;

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 Norway 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.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 2.11.2021
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This document specifies a method for determining the shear strength of adhesive bonds in close contact glue line and thick glue line.

It is suitable for the following applications:

a)    for assessing the compliance of adhesives with EN 301, EN 15425, EN 16254, EN 17334 and EN 17418;

b)    for assessing the suitability and quality of adhesives for load-bearing timber structures.

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 for structural design and does not necessarily represent the performance of the bonded member in service.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 2.11.2021
Zobraz více Zobraz méně
 

This document specifies a method of determining the minimum pressing time for two glue line thicknesses, close contact glue line and 0,3 mm thick glue line (for gap filling adhesive 1,0 mm), at three temperatures. It is applicable to adhesives used in load- bearing timber structures.
This document is only intended for obtaining a reliable base of comparison of pressing time between adhesives. The method gives results that 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.