Made from food grade PTFE Teflon® this 1/2" Tri Clover gasket is excellent for high temperature locations such as where a connection will exist in the heat wash of a burner.  Because it is a relatively hard gasket it is the gasket of choice where you want the two fittings to be able to rotate on each other such as a rotating racking arm. 

Temperature range is -100*F to 500*F