Durometer is one of several measurements for the hardness of a given material—typically soft materials such as polymers, elastomers, and rubbers. The term is also used to refer to the measurement device itself.

In the 1920s, Albert F. Shore—founder of the Shore Instrument Company—developed a durometer device to measure the hardness of materials. The term “durometer” today usually refers to “Shore hardness.” Rigid materials like hard epoxy systems are measured using the Shore D durometer. Flexible materials like urethanes, similar in hardness to a tire or pencil eraser, are measured with a Shore A durometer. Materials with gel-like hardness are often measured with a Shore OO durometer.

See also Hardness.

Epic uses test method ASTM D2240.

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