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Essentially, an O Ring is a mechanical gasket that is shaped like a torus, or in more basic terms, it is a loop comprised of elastomer material with a round cross section. An O Ring is typically designed to fit into a groove and when it's compressed in an assembly of two or more mechanical parts, it creates a seal. 

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AS568 O Rings are the US standard O Ring reference system. The cataloging system was developed by the Society of Automotive Engineers (SAE) and issued in 1971.

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In elastomers, there are multiple compounds that make up various materials. These materials all have various uses, compatibilities, and harnesses, as such, each material has specific usages and requirements. These materials can be used in a variety of applications ranging from dynamic to static, high temperatures to low temperatures, and high pressure or low pressure. Some materials may be chemical resistant or compatible while others are not. 

These graphs below present all the elastomer materials and their specific specifications. 

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