Relationship between gasket performance and gasket material performance

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NO.	Properties of Material	Impact on performance of Gasket
1	Density	Refers to the tightness of the material structure, directly affects the bulk leakage of the gasket.
2	Gauge	Affects compressibility, stress relaxation and crush resistance
3	Compressibility	Affects the conformability between the flange surface and the gasket (interface leakage). When the compression rate is too high, the crush resistance will be lower, and the stress relaxation will be greater.
4	Recovery	Affect the interface leakage. Especially when the application temperature increases, the flange surface may deform resulting in a fall in flange pressure. If the gasket material can rebound to maintain the conformability between the gasket and flange surface, the sealing function of the gasket can be maintained.
5	Tensile	No direct impact on sealing performance, but strength generally represents the toughness and fastness of the gasket material which indirectly affect the blow-out resistance of a gasket.
6	Creep Relaxation	When gasket material is working under pressure and temperature, the gasket structure can slowly creep to become thinner (stress relaxation). During application. A gasket material with great stress relaxation can affect the interface leakage (due to thinning), which is the main cause of the longevity of the gasket seal.
7	Crush Resistance	With the tightening of bolt torque, the pressure applied onto the gasket will increase. The gasket material must have the ability to withstand the torque flange pressure in order to avoid leakage caused by crushing of the gasket.
8	LOI	A Is a phenomenon of weight loss of gasket material under a certain temperature. The ignition-loss indirectly represents the temperature resistance of a sealing material at different temperatures.
9	Immersion Tests	Refers to changes of a gasket material after immersed in different liquids (lubricants, refrigeration fluids, water, etc.) under certain temperature time conditions.