Since the gasket types are many different occasions and for different parts, you must select the right gasket. Any type of gasket in the harsh environment, to ensure a long effective seal must have the following important features.

Hermetic: sealing system for media, the gasket does not leak occur within the recommended temperature and pressure of work some time. PTFE gasket on the air tightness performance was relatively good.

Compressibility: contact surface gaskets and flanges after connecting bolts should be in good agreement, in order to ensure the seal.

Creep resistance: shim under the influence of pressure and temperature of the load, creep resistance should be good, or else return to cause the bolt torque loss, resulting in surface stress gasket reduced so hard gas system leak.

Chemical resistance: the choice of the gasket should not be corrosive chemical media, and the media can not be contaminated.

Resilience: even if the system stable condition, two flanges connected due to the influence of temperature and pressure will certainly there is a slight displacement of the gasket elasticity should be able to compensate for this shift, in order to ensure tightness of the system.

Anti-bonding: the gasket should be able to facilitate the removal from the flange after use, not bonding.

Non-corrosive: flange gasket surface connected to cope with non-corrosive.

Resistance to temperature: the choice of the gasket should ensure the normal use at the lowest temperature and the highest temperature of the system.