What is BS 2782-1: Method 131B – Extensibility of flexible polyvinyl chloride sheet about?
Thermal properties of plastic decide how the material reacts when subjected to fluctuating temperatures, which is an essential parameter to consider when it comes to processing the material into the final product.
BS 2782-1 discusses Method 131B for extensibility determination in a flexible polyvinyl chloride sheet.
Method 131B has been prepared under the direction of the Plastics Standards Committee. 
Method 131B is one of the series of methods described in BS 2782-1 for the evaluation of extensibility after heat ageing of a flexible polyvinyl chloride sheet.
BS 2782-1: Method 131B describes a procedure for assessing the tendency of polyvinyl chloride sheet, of thickness not exceeding 0.9 mm, to deteriorate in service through loss of plasticizer by volatilization.
Who is BS 2782-1: Method 131B - Extensibility of flexible polyvinyl chloride sheet for? 
BS 2782-1: Method 131B on extensibility of flexible polyvinyl chloride sheet is relevant to: 
- Manufacturers of flexible polyvinyl chloride sheets
- Plastic manufacturing industry 
- Product designers/product development teams 
- Quality control and testing authorities 
Why should you use BS 2782-1: Method 131B - Extensibility of flexible polyvinyl chloride sheet?
Evaluating the thermal properties of plastics and polymers is crucial in determining the performance, quality and durability of the material, such that the final products function as desired. In the case of polyvinyl chloride, it is added with plasticizers to eliminate rigidity up to the desired need for its use. However, with time, the plasticizers that provide flexibility, degrade.
In this regard, the main objective of BS 2782-1: Method 131B is to assess the tendency of polyvinyl chloride sheet to deteriorate in service through the loss of plasticizer.
BS 2782-1: Method 131B covers molding conditions, design and shape of the plate, injection mould, preparation of the test specimen, along with best industry guidance on the test procedures.
As a result, BS 2782-1: Method 131B can play a significant role in demonstrating whether or not the flexible polyvinyl chloride sheet is fit for the intended end-application use.
