Hardness (Shore A and IRHD, N and M)
ISO 48 (IRHD) or ISO 7619-1 (Shore A)

There are various methods to measure hardness,  e.g. Shore A and IRHD. They have no direct linear relation, but they are comparable. Shore A and IRHD N (normal) are used for thicker test pieces. IRHD M (micro) is used for thinner test pieces and test pieces with a particular curvature (O-rings).

 

The test is carried out according to ISO standard 48 (IRHD) or ISO 7619-1 (Shore A) unless otherwise desired.

 

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