Compressibility
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Swell
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- Material must be squeezed to seal a gap but not deform
- A gasket must completely fill the space requiring sealing.
- The material must provide resistance over time
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- Some gaskets must resist liquids and not swell
- In other applications gaskets are designed to swell. They are engineered to absorb
liquids, forcing the gasket to expand and achieve a perfect seal. This is knows as
controlled swelling
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Relaxation
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Flexibilty
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- Once compressed the material must expand to completely fill the gap and Maintain its
integrity over time
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- Gasket material must be suited to the application it is sealing
- Stressed sump gaskets must withstand the stressed loads between an engine and the
stressed sump when a chassis moves during operation
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Recovery
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- The gasket material must perform correctly in a changing operating environment,
withstanding extreme heat and liquids under pressure
- It must return to its original state to maintain the perfect seal, for example during
the expansion and contraction of heated metals
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