Moisture reaction type pressure disc type polyurethane Pur hot melt rubber machine of heating disc surface multilayer Teflon (iron fluoride Dragon) processing, Pur hot melt rubber machine melt rubber disc sealed ring used United States du State full Viton for material, highest resistance high temperature reached 307 ?, resistance corrosion, resistance high temperature, can effective prevent any material stick with, cleaning easy, applies Yu international standards of two species specifications barrels loaded Pur hot melt rubber, without replaced melt rubber disc can using.