How much temperature can asbestos board withstand?
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To what degree can asbestos boards withstand? Can it be used for high temperature valve sealing? The operating temperature of my high temperature valve is 800-900 degrees
GB3985 "Rubber Asbestos Board"* * Standard, "This standard is applicable to equipment with a temperature of 450°C and a pressure of 588N/cm2 or less and water, steam and other media-based equipment, and the sealing gasket material used in pipe flange connections." It uses wound graphite gaskets, which can withstand high pressure and high temperature of 2000°C.
450℃~~~~~~~~~~~~~~~~~~~~
For your temperature, you can use pure asbestos, which can withstand temperatures up to 1000°C. If used for sealing, due to the bulkiness of asbestos, it needs to be pressed very tightly, otherwise it will leak.
Asbestos fiber has good heat resistance. Generally, it loses less weight when heated below 300°C for 2 hours. If heated for 2 hours at a temperature above 1700°C, chrysotile asbestos fiber loses more weight, while other types of asbestos fibers lose less weight.