The most commonly used hardness test for elastomers is the Shore hardness test according to DIN ISO 7619-1, which is the resistance of a rubber sample to the penetration of a conical body of a certain size under a defined compressive force. Depending on the design of the measuring body, a distinction is made between Shore A for softer elastomer compounds and Shore D for harder elastomer compounds.
In order to achieve an impeccable measurement of Shore hardness, the standard specifies a sample thickness of 6 mm. If measurements are carried out on finished parts with lower wall thicknesses, these usually lead to incorrect results.
The commercially available elastomer compounds for technical rubber mouldings have a hardness range of 20-90 Shore A.
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