This part of ISO 7619 specifies a method for determining the indentation hardness (Shore hardness) of vulcanized or thermoplastic rubber using durometers with the following scales:
- the A scale for rubbers in the normal hardness range;
- the D scale for rubbers in the high hardness range;
- the AO scale for rubbers in the low hardness range and cellular rubbers;
- the AM scale for thin rubber test pieces in the normal hardness range.