ORings Design Guidelines, Specifications, Materials An Oring , also known as a packing , is a flexible gasket in the shape of a loop;Durometer (Shore A) is a measurement of the hardness of an elastomeric compound The numerical ratings for hardness run from lower numbered (less than 70) softer materials to higher numbered (greater than 70) harder materials, noting that fluorocarbon has a base rating of 75 This classification system is designed to work within a ±5 point rangeIt is a elastomer with a round crosssection designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal
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