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The Rockwell hardness test is the most used and versatile of the hardness tests. For soft materials such as copper alloys, soft steel, and aluminum alloys a 1/16 diameter steel ball is used with a 100-kilogram load and the hardness is read on the B scale.
Barcol hardness is not a valid hardness measure for curved surfaces. Scales and values. The governing standard for the Barcol hardness test is ASTM D 2583. Barcol hardness is measured on a scale from 0 to 100 with the typical range being between 50B and 90B. A measurement of 60B is roughly equivalent to a Shore hardness of 80D or a Rockwell hardness R100.