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ISO 305:2019

Current Date published:

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

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.

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Related Information

Similar Standards

  • BS 1524:1993

    Specification for cellulose acetate moulding materials

  • BS 2571:1990

    Specification for general-purpose flexible PVC compounds for moulding and extrusion

  • BS 2782-1:Method 130A:1991

    Methods of testing plastics. Thermal properties, Determination of the thermal stability of polyvinyl chloride by the Congo red method

  • BS 2782-1:Method 131B:1983

    Methods of testing plastics. Thermal properties, Determination of extensibility after heat ageing of flexible polyvinyl chloride sheet

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ISO 305:2019

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