In the use of thermal gaskets, the pressure and temperature are mutually restricted, with the increase of temperature, after the equipment has been running for a period of time, the gasket material softening, creep, stress relaxation phenomenon, mechanical strength will also decrease, the sealing pressure is reduced. And vice versa. For example, the manual lists high pressure asbestos rubber sheet XB450 in water and steam media, the use of temperature 450℃, pressure <6MPa (the material for sealing performance test, at 440℃~450℃, 12MPa steam pressure for 30 minutes). However, in long-term actual use, if the temperature reaches 450 ° C, the pressure that can be sealed is only 0.3~0.4MPa. For the gas medium with strong permeability, it is only 0.1-0.2mpa.
(1) Has good elasticity and recovery, can adapt to pressure changes and temperature fluctuations;
(2) It has appropriate softness and can fit well with the contact surface;
(3) no pollution process media;
(4) has enough toughness without breaking due to pressure and fastening force;
(5) No hardening at low temperature, small shrinkage;
(6) Good processing performance, convenient installation and pressing;
(7) Non-bonded sealing surface, easy to disassemble;
(8) Cheap price, long service life.
