We have different kind of Gaskets like
F Metal Jacketed Gaskets
F Ring Type Joints
F Corrugated Gaskets
F Spiral Wound Gaskets
F Camprofile Gaskets
F Cut Gaskets
F PTFE Envelope Gaskets
F A gasket is the lowest-cost component in a flanged assembly. It offers the greatest opportunity for overall cost saving if the design is right but the greatest potential for loss if the design is wrong. In summary:
F don't re-use gaskets
F don't use unbranded gaskets
F don't use jointing compounds
F the gasket should be as thin as possible
F always lubricate bolts
F if possible, select a torque which represents between 50% and 80% of the yield stress
F use an acceptable assembly procedure