Compression set at constant strain is defined as the difference between the original thickness of a test specimen and its thickness after recovery, expressed as a percentage of the initial compression applied. This test measures the ability of vulcanized rubber to retain its elastic properties after being subjected to prolonged compression under constant strain.

In this method, cylindrical disc-shaped test specimens are compressed to a specified strain and maintained under controlled temperature conditions for a defined period. After the compression period, the specimens are allowed to recover, and the compression set value is calculated.

The “IKON” Compression Set Apparatus (Constant Strain Type) is specifically designed to determine the compression set of vulcanized natural and synthetic rubber materials, ensuring accurate and reliable testing results for quality control and research applications.