Compression set (DIN EN ISO1856)

The residual deformation of a vulcanizate after a long-term, constant deformation is defined as the compression set. This measures the extent to which the compressed test specimen has not recovered after a certain time after relaxation. The information is given as a percentage of the ratio of the distance that has not recovered to the compressed distance.

The test is carried out at room temperature, lower or higher temperatures and for different exposure times. Typical measuring conditions are 72 hours/room temperature and 24 hours/70°C. Another common term for compression set is “compression set”.

See also: Compression deformation test