mechanical seal RC891 1.equivalent to chesterton 891 2.Temperature: -40 to 230 centigrade degree 3.Material: car/sic/TC/cer equivalent to chesterton 891 sealTemperature: -40 to 230 centigrade degreeRC891 is a balanced high performance, single, inside mounted seal.Material: Metal part(SS316,etc)Seal face(carbon, sic,TC, ceramic, etc)Oring: Viton, EPDM, etc.