Another group of materials which are sometimes used in this same type of applications as urethanes are plastics.
One advantage of urethane elastomers over plastics is that they are not brittle. Many plastics, particularly in the higher hardnesses, tend to crack and break under impact and shock loading.
Urethane remains true elastomers maintaining their high impact resistance even up to every high hardnesses. Urethanes also have elastomeric memory, that is, they can be stretched even at high hardnesess to substantial elongations and will return to their original dimensions. Most plastics, once they have been stretched beyond a certain point, remain permanently stretched. Finally, plastics, in general, do not have the high abrasion resistance of polyurethanes.
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