Gummi- och plastindustri

Ämnesområden: Gummi
Kommittébeteckning: SIS/TK 154 (Gummi och gummiprodukter)
Källa: ISO
Svarsdatum: den 28 okt 2021
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This document specifies three test methods for the determination of the tear strength of vulcanized or thermoplastic rubber, namely the following:
— method A, using a trouser test piece;
— method B, using an angle test piece, with or without a nick of specified depth;
— method C, using a crescent test piece with a nick.
The value of tear strength obtained depends on the shape of the test piece, speed of stretching, and temperature of test. It can also be susceptible to grain effects in rubber.
Method A: Using a trouser test piece
Method A, using the trouser test piece, is preferred because it is not sensitive to the length of the cut, unlike the other two test pieces in which the nick has to be very closely controlled. In addition, the results obtained are more easily related to the fundamental tear properties of the material and are less sensitive to modulus effects (provided that the leg extension is negligible) and the rate of propagation of the tear is directly related to the rate of grip separation. With some rubbers, the propagation of tear is not smooth (knotty tear), and analysis of results can be difficult.[3]
Method B, procedure (a): Using an angle test piece without nick
This test is a combination of tear initiation and propagation. Stress is built up at the point of the angle until it is sufficient to initiate a tear and then further stresses propagate this tear. However, it is only possible to measure the overall force required to rupture the test piece, and, therefore, the force cannot be resolved in two components producing initiation and propagation.[4]
Method B, procedure (b): Using an angle test piece with nick
This test measures the force required to propagate a nick already produced in the test piece. The rate of propagation is not directly related to the jaw speed.[5]
Method C: Using a crescent test piece

This test also measures the force required to propagate a nick already produced in the test piece, and the rate of propagation is not related to the jaw speed.
NOTE A separate method for the determination of the tear strength of small test pieces of rubber (Delft test pieces) is specified in ISO 34-2.[1]

Ämnesområden: Plast: allmänt
Kommittébeteckning: SIS/TK 156 (Plast)
Källa: ISO
Svarsdatum: den 8 nov 2021
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This document specifies the terms and definitions, requirements, test methods, test regulations and packaging, transportation and storage of biodegradable plastic shopping bags for industrial composting.
This document is applicable to plastic shopping bags made from biodegradable plastic resin as the main raw material, processed by heat sealing or bonding, etc. It is also suitable for shopping bags made of composite of biodegradable plastic and other materials.
This document does not apply to such biodegradable plastic bags as biodegradable roll bags (also known as tear bags or point break bags made from the above materials) that are only used in packaging and are not used for carrying shopping.

Ämnesområden: Plast: allmänt
Kommittébeteckning: SIS/TK 156 (Plast)
Källa: ISO
Svarsdatum: den 8 nov 2021
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This document specifies the terms and definitions, basic requirements, technical requirements, test methods, test regulations, and packaging of industrial compostable drinking straws.

Ämnesområden: Lim; Bygg och trälim
Kommittébeteckning: SIS/TK 162 (Lim och limningsteknik)
Källa: CEN
Svarsdatum: den 18 nov 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.

Ämnesområden: Lim; Bygg och trälim
Kommittébeteckning: SIS/TK 162 (Lim och limningsteknik)
Källa: CEN
Svarsdatum: den 18 nov 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.

Ämnesområden: Lim; Bygg och trälim
Kommittébeteckning: SIS/TK 162 (Lim och limningsteknik)
Källa: CEN
Svarsdatum: den 18 nov 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.

Ämnesområden: Lim; Lim utom bygg- och trälim
Kommittébeteckning: SIS/TK 162 (Lim och limningsteknik)
Källa: CEN
Svarsdatum: den 18 nov 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.

Ämnesområden: Lim; Bygg och trälim
Kommittébeteckning: SIS/TK 162 (Lim och limningsteknik)
Källa: CEN
Svarsdatum: den 18 nov 2021
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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.

Ämnesområden: Lim; Bygg och trälim
Kommittébeteckning: SIS/TK 162 (Lim och limningsteknik)
Källa: CEN
Svarsdatum: den 18 nov 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.

Ämnesområden: Kryogena kärl; Slangar
Kommittébeteckning: SIS/TK 289 (Gassystem)
Källa: CEN
Svarsdatum: den 19 nov 2021
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This document specifies design, construction, type and production testing, and marking requirements for non-insulated cryogenic flexible hoses used for the transfer of cryogenic fluids within the following range of operating conditions:
— working temperature: from −270 °C to +65 °C;
— nominal size (DN): from 10 to 100.
End fittings for mounting of any couplings are within the scope of this document, but the couplings are subject to other standards.
It is intended that the hose be designed and tested to satisfy a rated pressure. Hoses may be then selected with a PR equal to or greater than the maximum allowable pressure (PS) of the equipment to which it is to be used.

Ämnesområden: Lim; Lim utom bygg- och trälim
Kommittébeteckning: SIS/TK 162 (Lim och limningsteknik)
Källa: CEN
Svarsdatum: den 15 dec 2021
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This document specifies a T‑peel test for the determination of the peel resistance of an adhesive by measuring the peeling force of a T‑shaped bonded assembly of two flexible adherends. This test procedure does not provide design information.
NOTE This method was originally developed for use with metal adherends but other, flexible, adherends can also be used.