1 graphite, PTFE and asbestos as filler 2 temperature:-200-870 degree 3 pressure:32Mpa 4 ISO9001 certified... Filler:graphite, PTFE, asebstos, non-asbestos Winding and centering material: SS and all kinds of alloyThey are suitable for petroleum, chemical, mechanical, power and ship building industries, static sealing at connecting joints of flanges of pipeing valves, pumps, pressurized vessels, ...