BS EN ISO 305:2019

What is ISO 305-Determination of thermal stability of poly (vinyl chloride) about?  

ISO 305 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. 

Who is ISO 305-Determination of thermal stability of poly (vinyl chloride) for? 

ISO 305 on thermal stability of poly (vinyl chloride) is useful for: 

• Manufacturers of bottles 
• Manufacturers of pipes 
• Manufacturers of handbags 
• Manufacturers of electric cable insulation 
• Manufacturers of ropes 
• Manufacturers of toys 
• Poly (vinyl chloride) testing laboratories 

Why should you use ISO 305-Determination of thermal stability of poly (vinyl chloride)?  

Poly (vinyl chloride) is very sensitive to elevated temperatures and light and undergoes significant deterioration when exposed to temperature and light. To prevent thermal degradation during processing and light-induced deterioration of the finished product, chemical compounds with a stabilizing effect are used.  

ISO 305 ensures to determine the thermal stability of PVC by two different methods they are: 

• Method A: Oil-bath method: An oil bath is a laboratory heating device that uses boiling oil as the temperature regulator and provides uniform temperature control for synthetic reactions 
• Method B: Oven method: quick and cost-effective solution that meet the high-quality standards of the plastic industry 

Hence, ISO 305 makes sure the quality of the PVC meets desired levels of stability when exposed to heat. If you are a manufacturer, complying with these test methods can help demonstrate the durability, quality and performance of your products. 

What’s changed since the last update?  

BS EN ISO 305:2019 supersedes ISO 305:1990 which has been withdrawn. BS EN ISO 305:2019 has editorial changes have been applied to align the document with the ISO structure and Normative references and terms and definitions have been added and subsequent clauses have been renumbered.