Ethylene-propylene rubber has the best dimensional stability among the elastomeric materials listed, outperforming natural rubber, styrene-butadiene rubber, and polybutadiene rubber in maintaining shape under various conditions.
Among the types of elastomeric materials listed, ethylene-propylene rubber is known to have the best dimensional stability. This type of synthetic rubber performs well in a variety of conditions, including exposure to weather, ozone, and heat. Ethylene-propylene rubber's strong resistance to degradation from a wide range of temperatures and its ability to maintain its shape over time under stress make it a superior choice for applications where dimensional stability is crucial.
Natural rubber may have excellent stretch and resilience, but it does not have the same level of dimensional stability as ethylene-propylene rubber. Styrene-butadiene rubber and polybutadiene rubber, while used extensively for their own advantageous properties, such as resistance to wear and abrasion, do not offer the same stability as ethylene-propylene rubber.
So, ethylene-propylene rubber outperforms natural rubber, styrene-butadiene rubber, and polybutadiene rubber in terms of dimensional stability.