the combination materials of DY443 mechanical seals are resin carbon vs ceramic,silicon carbide vs silicon carbide,and tungsten carbide vs tungsten carbide and NBR,FKM,epdm etc can be available as o-rings. the speed of mechanical seal shafts is less than 10m/sec and the seal working pressure is less than 0.8 MPa and the pump seal working temperature is limiited from minus 20 degrees to 150 degrees
