What is the maximum temperature resistance of temporary gaskets made by cutting asbestos sheets oneself? What is the voltage tolerance?

Are there still companies that manufacture asbestos board cutting gaskets? What irresponsibility! Asbestos materials were thoroughly inspected in Nanjing three years ago; all chemical plants that used them were required to make corrections or replacements, otherwise they would have to suspend operations. Its alternative product now is plant fiber board. If you insist on using it, be sure to confirm that the material is non-corrosive – asbestos boards are not corrosion-resistant! The gaskets produced by our factory from plant fiber board are 3.2 mm thick, and we have tested them and found that they break down at 55 bar instantly. (The safety valve of the metering pump kept leaking, so I cut a piece of cardboard to plug it; however, it turned out that the outlet was blocked, which is how I realized the problem.) It’s really not advisable to use asbestos gaskets – there are no regulations in GB regarding their use. Suppliers sell them based on their own conscience, because in the event of an accident, it’s you who used non-standard, discarded gaskets, and you will have to bear all the responsibility; the supplier isn’t at fault even if they are unscrupulous.