... Ring:Ceramic(Alumina),Silicon Carbide Reaction Bonded,Silicon Carbide Sintered Pressureless,Ni-binder Tungsten CarbideRotary Ring:Resin Impregnated Carbon Graphite(Furan ... ),Antimony Impreg. Carbon Graphite,Silicon Carbide Sintered Pressureless,Silicon Carbide Reaction Bonded Secondary Seal:Nitrile(NBR),Ethylene Propylene ...