PTFE wedge mechanical seals DY58P and DY59P can be applied in fluids such as petroleum,chemical solvents, extreme corrosion, etc.the temperature is from -40oC to 250oC and the pressure is less than 2.5Mpa and the pump shaft rotation is less than 20 m/Sec.wedges and gaskets are made of PTFE/teflon, resisting very extreme corrosion.