What are the Operating Temperatures of Silicone Rubber?

When it comes to heat stability, silicone is unlike most other rubbers as it can withstand extremes of temperature without deforming. However, testing has shown, a critical factor that determines silicone’s heat resistance is the length of time it is exposed to extreme temperatures for. Continuous exposure to maximum temperatures will cause silicone to degrade over a sorter life span. Viking extrusions offer the following grades of silicone for high and low temperature applications:

General Purpose Silicone (VGP)

Available from 10 shore A to 80 shore A. Our peroxide cured general purpose compound can withstand temperatures from -70C to +200C without losing its mechanical properties.

Heat Stabilised Silicone (VGP—HST)

This compound is available from 40 shore A to 70 shore A and includes a heat stabilising additive making it suitable for applications from -70C to +260C

High Temperature Silicone (VTHT)

Our highest temperature grade of silicone. Available from 40shore A to 75 shore A and able to operate in temperatures from -70C to 300C. The high temperature additives in this compound give it a natural cream colour, limiting its pigmentation possibilities.  

Low Temperature Silicone (VLTD)

A specialised low temperature grade material that maintains its flexibility in extreme temperatures as low as -116C and heat resistant up to 200C. Usually supplied in an off-white pigment state and not FDA approved.


If you have any questions regarding silicone applications, please contact us and we will be happy to assist you.