Some properties of gasket material
Gaskets must maintain a seal for an acceptable period against all the operational forces involved. To achieve this, there are eight important properties which any gasket material must possess these properties.
The gasket should not be porous to the fluid being sealed.
The gasket should compress into the imperfections on the flange sealing faces to create the initial seal.
3.Stress relaxation (creep resistance)
The gasket should not show significant flow (creep) under the influence of load and temperature. Such flow will allow the bolts to relax, reduce gasket surface stress and cause leakage.
Although normally stable, flanges do move slightly relative to one another under the influence of cycling temperature and pressure. The gasket should be capable of compensating for such movements.
The gasket should withstand chemical attack from the process medium being handled. Likewise, the gasket material itself must not contaminate the process medium.
The gasket should be able to withstand the effects of the maximum and minimum temperatures within the process and the external atmospheric temperatures.
The gasket has to be easily removable after use.
The gasket must not cause corrosion of the flange faces.
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