International Rubber Hardness Degree (IRHD)
International Rubber Hardness Degree (IRHD) :
A unit used to measure the hardness of rubber and similar materials (technically known as elastomers). Measurements are made using an IRHD durometer, and the results are usually similar, but not identical, to readings made with the older Shore "A" durometer. The International Organization for Standardization (ISO) and the American Society for Testing and Materials (ASTM), among other standards agencies, have published IRHD test procedures
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