Block rubber is also known as Technically Specified Rubber (TSR), which can be classified into different grades according to its properties: dirt content, volatile matter, viscosity and ash content etc.

 

Our STR20 is certified by the Rubber Authority of Thailand (RAOT) to guarantee the highest quality possible.

 

Click here to see the certificate of analysis of STR20

 

Our block rubber only comes from ISO certified rubber factories in which certificates are available upon request.