ASTM D2240
ASTM D2240 – Standard Test Method for Rubber Property—Durometer Hardness Description: Scope 1.1 This test method covers twelve types of rubber hardness measurement devices known as durometers: Types A, B, C, D, DO, E, M, O, OO, OOO, OOO-S, and R. The procedure for determining indentation hardness of substances classified as thermoplastic elastomers, vulcanized (thermoset) rubber, …