copper washers
1.materials:copper asbestos non asbestos  iron
2.copper washer is used in machinery fields
3.it has a good thermal conductivity
4.it is suitable for using on the flange pipe of high pressure and high temperature
5.it is easy that the top cover of pressure  vellel is closed in all kinds of the valves
6.temperature in the high situation can still guarante good mechanical properties
7.the hardness is no more than 45HB