Rockwell Hardness - ASTM D785 Plastic Test Standard
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Rockwell Hardness - ASTM D785
Rockwell hardness is a measure of the indentation resistance of a material. Testing is performed by first forcing a steel ball indentor into the surface of a material using a specified minor load. The load is then increased to a specified major load and then decreased back to the original minor load. Rockwell hardness is a measure of the net increase in depth of the indentor. Each Rockwell scale division represents a 0.002 mm (0.00008 in) penetration of the indentor.
Rockwell hardness is calculated by subtracting the penetration divided by the scale division from 130. For example, if the indentor has a net depth increase of 0.12mm, the Rockwell hardness is 70.
Shown below is a hardness comparison chart. Hardness is a complex material property influenced by a variety of factors. Any conversions using this chart will be a rough estimate and should not be considered an exact conversion.
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