Sealing materials, ranges of temperature

NBR (Acrylnitril-Butadien-Caoutchouc, e.g. Perbunan)
-30 °C to 100 °C

FKM (Fluorocaoutchouc, e.g. Viton®)
-20 °C to 200 °C

EPDM (Ethylene-Propylene-Dien-Caoutchouc)
-50 °C to 150 °C

PTFE (Polytetrafluoroethylene, e.g. Teflon)
-200 °C to 230 °C

POM (Polyacetal, e.g. Delrin)
-40 °C to 80 °C

Perbunan, Viton®, Teflon and Delrin are registered trademarks of the manufacturers.

Please pay attention to the advises of DIN 7716 (products made of caoutchouc and rubber; requirements for storage cleaning and service).