Urethane Rubber

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Urethane elastomers are widely used when a flexible mold material is required and the more expensive and less abrasion-resistant silicone rubber is not desired. However, their use requires careful application of release agents as urethanes are adhesive. When used in conjunction with sealant and a release agent, urethane rubber can be poured or brushed to make accurate moulds or elastomeric components such as engine mounts. Urethane rubber develops a viscosity similar to water when in liquid form so vacuum degassing is not usually necessary. Urethane rubbers cure with negligible shrinkage to a durable rubber that will last in production.