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Normas BSI – AENOR
BS EN ISO 305:2019

BS EN ISO 305:2019

Plastics. Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds. Discoloration method

Fecha:
2019-06-18 /Definitive
Comité:
PRI/82
Equivalencias internacionales:

EN ISO 305

ISO 305

Relación con otras normas BSI:

Reemplaza a: BS EN ISO 305:1999

Resumen:

This document specifies two methods for the determination of the thermal stability of products and compounds based on vinyl chloride homopolymers and copolymers (referred to simply as PVC in the following text) by the extent of the discoloration that occurs when they are exposed, in the form of sheet, to elevated temperatures. The two methods are:

  • Method A: Oil-bath method;

  • Method B: Oven method.

These methods are particularly applicable to the determination of the resistance of PVC to degradation by heat, as assessed by the change in colour after different times of heating under standardized conditions. The results are comparative only, and can be unsatisfactory when coloured PVC materials are tested.

The stability times given by the two methods might not be similar and cannot be used for direct-comparison purposes.

Keywords:
Testing conditions, Specimen preparation, Copolymers, Chlorine, Polymers, Thermal stability, Test equipment, Plastics, Temperature, Polyvinyl chloride, Colour tests, Test specimens, Homopolymers, Thermal resistance
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