What is rebound resilience?

Rebound resilience is a measure used to describe the damping of rubber components. It describes the percentage by which the test specimen moves away from the elastomer is pushed back by the elastomer. A high value means low damping. Flummis (rubber balls) are known in everyday life for their very high rebound resilience. It is measured by bouncing a steel ball on the rubber over a certain distance. The ratio of the initial distance and the rebound distance gives the rebound resilience. The test is defined in the DIN 53512 or ISO 4662 standard. Natural rubber has by far the best rebound resilience. However, EPDM, silicone and NBR are also suitable for this purpose. The ability to return to the starting position from a deformation is known as elasticity is referred to as elasticity.