The Shore hardness scale measures the hardness of elastomers (rubber, EPDM, PVC, Silicones, TPE, TPV, SEBS…), some plastics, leathers, wood…

For our range of materials, we use scales A and D:

  • Shore A (for soft materials)
  • Shore D (for hard materials)

Measurement conditions and different hardness scales

Shore hardness

The measuring tool is called durometer.

The tip of the penetrating rod is different on Shore A and Shore D durometers.

To measure the hardness correctly, the sample must have a minimum thickness of 6 mm (we recommend 10 mm).

The profile surface must be flat.

For an extruded profile, the measurement must be taken on the section (not on the external surfaces): therefore it is necessary to cut the profile to have a regular slice.

The measurement must be made at ambiant temperature on a hard flat surface.

Shore hardness scale

Measurement tolerances

Tolerances are usually +/- 5 shore, it allows to take into account the vulnerability of the measurement method and the manufacturing process.

Do you have a question or a specific request?

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