... : NBR, EPDM, Viton, silica gel and chlorinated rubber3) Tungsten carbide and graphite4) Our products:Pump seal: WM301, WM155, WM560A, WMBIA, ... WM1, WM20 and WMFBD Industrial pump seal: WM1527, WMCG, WM58U 59U ... , WM5Q and WMCU Double mechanical seal: WM202/208, WM50D, WM47D and WD5ED Automobile seal: WMB, WMBRS, WMBS, WMBG, WMBR ...