Copper Washer - TOOGOO(R) 20Pcs 14mmx22mmx1.5mm Copper Crush Washer Flat Ring Gasket Fitting Operation temperature: 350C Max. Operation pressure:16MPa Melting point: 1083C opper Provides a Tighter Seal and Greater Heat Endurance than Steel and Rubber Washers. Widely applied in the flange and the connection of the chemical plant, electricity generating station, nuclear power station, and electronic, digital consumer products, hardware, precision instruments, electrical appliances, bearings, air pumps, water pumps, water valves, air cylinder, sealing the high pressure braking systems. ect.