... chemical and power plantsb) Different kinds of material such as carbon, carbon impregnated with resin/metal, silicon carbide, tungsten carbide, ceramic, ... wear, thermal shock resistance as well as self- lubrication effectHuaLian Carbon Industry Co,.Ltd Baochang Industrial Zone,Haimen226151,Jiangsu Province,China ... 82861888 Fax:86-513-82671094 Mobile:86-18362168162 Mechanical graphite seal ring