The tendency of a material to return to its original shape after deformation.
Elastomer
A general term used to describe both natural and synthetic polymers possessing the resilience required to return to approximate original shape after major or minor distortion.
Elongation
Generally referred to in terms of tensile (pull apart) testing, elongation is the increase in length of a test specimen, expressed as a percentage of its original (unstretched) length…relative to a given load at the breakpoint.
Extrusion
The forced extension of part of the seal into the diametrical clearance gap of the gland, caused by excessive system pressure.