We offer wb2/wb2a pump parts of mechanical seal.it is structure with materal of ptee. It is can make up for pump shaft circular runout, single pump face seal packed , easily loading and unloading , perfectly opearating status . carry with instruction line , which is located in middle of seal it have three materials of mechanical seal dynamic & static ring connect face according delivery medium 1, 99% alumina ceramics 2, reaction sintered silicon carbide 3, pressureless sintering of silicon carbide application range : pressure : 0.5mpaoperating temperature :-20-160 degreerotated speed :2m/smedium : acid , alkali , oil , macromolecule suspension liquid : if the medium contain granular , it is best choose of silicon carbide mechanical sealif the medium contain strongly alkali and hydrofluoric acid you 'd better to select pressureless sintering of silicon carbide mechanical seal