Compression set is the permanent loss of the ability to self-expand that results after a material is subject to normal compression cycles. Compression set is made worse by simultaneous exposure of certain materials to heat.
Impregnated, open-cell, foam is used as the backing for precompressed sealants because it features very low compression set.
Closed-cell foams suffer on average 25% permanent compression set under movement and temperature cycles typical in construction applications.
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