... high temperature steam resistant.4:No permeability to the gas.5:Suitable temperature:-50oC~150 oC6:We have got the WRAS ... and ISO9001 Certificate.7:Size: 1.5 "- 72". Materials:Rubber Seat Material: NBR, EPDM, NR, CR, SI ... fit for reference, customer must tell names,thickness,temperature,pressure in order.So that we can give you the best advice.