Elastomers deform under load and rarely return completely to their original dimensions when the load is removed. Most elastomers serve under a compressive load and the compression set is the value you will find the most.
Compression set is an important parameter for wheels. It gives a value for the sensitivity of a wheel to form flat spots, the so called ‘Monday morning soles’.
Vulkollan® has low values for compression set at ambient and elevated temperatures. This is one of the reasons why Vulkollan® has become the benchmark material in wheel applications.