Theory of hardness testing

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Hard facts

Theory of hardness testing

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Carbon testing

Plastic testing

The hardness of plastics and hard rubber can be determined using a loaded ball indenter in accordance with standard ISO 2039-1 or ISO 2039-2.

Standard ISO 2039-1 describes determination of the hardness value by means of a ball indenter test. The measured indentation depth is used to calculate the surface area of the indent and subsequently the hardness.

Standard ISO 2039-2 describes determination of the hardness value with a Rockwell hardness testing machine, using Rockwell hardness scales E, L, M and R, similar to the Rockwell method.

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