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Shore durometer
Durometer is one of several measures of the hardness of a material.
Hardness may be defined as a material's resistance to permanent indentation. The durometer scale was defined by Albert Ferdinand Shore, who developed a measurement device to measure Shore hardness in the 1920s. The term ''durometer'' is often used to refer to the measurement as well as the instrument itself. Durometer is typically used as a measure of hardness in polymers, elastomers, and rubbers.〔(【引用サイトリンク】title=Shore (Durometer) Hardness Testing of Plastics )〕
Shore's device was not the first hardness tester nor the first to be called a ''durometer'' (ISV ''duro-'' and ''-meter''; attested since the 19th century), but today that name usually refers to Shore hardness (other devices are simply called hardness testers).
== Durometer scales ==
There are several scales of durometer, used for materials with different properties. The two most common scales, using slightly different measurement systems, are the ASTM D2240 type A and type D scales. The A scale is for softer plastics, while the D scale is for harder ones. However, the ASTM D2240-00 testing standard calls for a total of 12 scales, depending on the intended use; types A, B, C, D, DO, E, M, O, OO, OOO, OOO-S, and R. Each scale results in a value between 0 and 100, with higher values indicating a harder material.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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