The Durometer is the international standard for measuring the hardness of rubber, plastic and other NON-METALIC materials. A durometer tool measures a compound's susceptibility to indentation, which should not be confused with durability or tensile strength as there is no inherent relationship across all compounds.  Durometers are described in the American Society for Testing and Materials specification ASTM D2240.  There are a variety of Durometer scales.  Our products are measured using the "Shore A" Scale

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