The effect of the effective area of an advanced ePTFE gasket on the EN13555[ 1 ] stress retention (PQR) properties was investigated. It was found that larger areas gave higher PQR values but the systems actually lost more force and gave lower final thickness values. This effect of higher PQR with higher force lost is explained mathematically, and the reason behind the thinner final gaskets is also explained. Further analysis shows that the force loss is linked to the ratio of effective area and stiffness, and this effect can be used to better estimate the PQR values of larger area gaskets.

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