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How to calculate the compression and rebound of gasket?

Compressibility and Reecovery
DIN-28090-2,ASTM-F36-87 Gasket compression and rebound in percentage, compression is in order to make the gasket to fill the flange surface roughness and defect in order to achieve sealing effect, the compression quantity related to the applied torque, compressibility is a range of gasket, not a fixed value, the size of the compressibility of numerical on normal flange seal does not have too big effect, unless the flange surface uneven or defect is bigger, need to offset amount or non-metallic materials of the large flange surface, need to torsion is compressed enough gaskets are more pay attention to the compressibility.Therefore, resilience is a more important parameter: resilience is the ability to maintain the torsion of the bolt to keep the flange face loose and to maintain the seal. For seals, resilience has more practical significance than compressibility.

Calculation of compressibility and resilience
(hi-he)/hi *100%=compressibility（%）
hd/(hi-he)*100%=resilience（%）
hi=Original thickness of gasket，he=The thickness after compression，hd=The thickness after compression and rebound

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How to calculate the compression and rebound of gasket?