EN ISO 305:2019

Plastics - Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds - Discoloration method (ISO 305:2019) EN ISO 305:2019

Publication date:   Oct 16, 2019

General information

60.60 Standard published   Jun 12, 2019


CEN/TC 249 Plastics

European Norm

83.080.20   Thermoplastic materials



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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.

Life cycle


EN ISO 305:1999


EN ISO 305:2019
60.60 Standard published
Jun 12, 2019