Plasty

Oblast zaměření: Plasty
Komise : CEN/TC 249 (Plastics)
Původce: CEN
K připomínkám do: 30.08.2019
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This International Standard specifies a method for the determination of the mass per unit area and five methods (Method A to Method E) for the determination of the fibre mass per unit area of moulding compounds and prepregs.

Method A: Extraction by soxhlet

Method B: Extraction by immersion in solvent in a beaker

Method C: Decomposition by loss ignition

Method D: Extraction by wet combustion

Method E: Method by calculation

This International Standard is applicable to the following types of material:

—    moulding compound and preimpregnated unidirectional sheet, tape, fabric and mats.

—    prepregs in which any type of reinforcement (aramid, carbon, glass, etc.) and any type of matrix (thermosetting or thermoplastic) has been used.

Typically, reinforcement fibres are coated with sizing or finishes. These normally dissolve with the resin and are, therefore, included in the resin content.

This International Standard is not applicable to the following types of prepregs:

—    these containing reinforcements which are soluble (or partly soluble) in the solvents used to dissolve the resin.

Oblast zaměření: Plasty
Komise : CEN/TC 249 (Plastics)
Původce: CEN
K připomínkám do: 3.09.2019
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This document specifies the dimensions, the method of sampling, the preparation of the test specimens and the conditions for performing the tensile test in order to determine the short-term tensile welding factor.

A tensile test may be used in conjunction with other tests (e.g. bend, tensile creep, macro) to assess the performance of welded assemblies, made from thermoplastics materials.

The test is applicable to welded assemblies made from thermoplastics materials filled or unfilled, but not reinforced, irrespective of the welding process used.

Oblast zaměření: Plasty
Komise : CEN/TC 249 (Plastics)
Původce: CEN
K připomínkám do: 3.09.2019
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This document provides the requirements for the tests made on welded thermoplastics semi-finished products.

The selection of the appropriate test method(s) should be made in accordance with the particular type and application of welded product.

The test results depend on the conditions of manufacture for the test specimen and on the test conditions. They can therefore only be related to the behaviour of the product or can only be used for designing a structure, if the test conditions can be related to the service conditions.

Oblast zaměření: Plasty
Komise : CEN/TC 249 (Plastics)
Původce: CEN
K připomínkám do: 24.09.2019
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This document specifies a method for the determination of the ultimate anoxic biodegradability of plastics made of organic compounds, where the amount of the produced nitrogen and carbon dioxide at the end of the test is measured.

The test substance is exposed to an inoculum stemming from the denitrification tank of a wastewater treatment plant. Testing is performed under defined laboratory conditions.