Specific Elastomeric Sheet Linings

An elastomer is generally considered to Ije any material, either natural or synthetic, that is elastic or resilient and in general resembles natural rubber in feeling and appearance. A more technical definition is provided by ASTM, which 

An elastomer is a polymeric material which at room temperature can be stretched to at least twice its original length and upon immediate release of the stress will return quickly to its original length. 

Elastomers are primarily composed of large molecules that tend to form spiral threads, similar to a coiled spring, which are attached to each other at infrequent intervals. These coils tend to stretch or compress when a small stress is applied, but exert an increasing resistance to the application of addition stresses. This phenonenon is illustrated by the reaction of rubber to the application of additional stress. 

In the raw state elastomers tend to be soft and sticky when hot, and hard and brittle when cold. Compounding increases the utility of rubber and synthetic elastomers. Vulcanization extends the temperature range within which they are flexible and elastic. In addition to vulcanizing agents, ingredients are added to make elastomers stronger, tougher, or harder, to make them age better, to color 

Resistance to high temperature Resistance to cold Long life Impermeability Resistance to sunlight Resistance to chemicals Resistance to oils Lack of odor or taste 

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