Castable polyurethanes are an elastomeric material which possess excellent properties. Uniquely it can be cast in a broad range of hardnesses to suit your requirements as it combines the toughness of metal with the elasticity of rubber.
High load bearing and tensile strength,
impact resistance - better than structured plastics
abrasion resistance
flex properties to resist cracking under repeated flexure
resilience - available in a wide range from heavy shock-absorbing uses to high-frequency vibration
temperature resistance - cold and heat
machineability