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Hardness

Hardness determines whether an abrasive media is capable of producing a profile on the blasting surface.

What is hardness?

Hardness is a resistance of metal to plastic deformation – usually by indentation.

This term may also refer to a metal’s stiffness, resistance to scratching, abrasion or cutting etc. It is the property of a metal which gives it the ability to resist being permanently deformed, bent or broken when an external load is applied.

How is hardness measured?

The most common hardness test applied is the Rockwell Hardness Test. This test is a hardness measurement based on the overall increase in depth of impression as a prescribed load is applied to the surface of the metal.

What determines abrasive hardness

Hardness determines whether an abrasive particle can etch or provide an anchor pattern on a particular substrate. One way to determine the hardness of an abrasive is to use the Mohs' hardness scale. The scale ranges from 1 to 10, with 1 being the softest (talc) and 10 being the hardest (diamond). Most abrasives that effectively achieve an anchor pattern on a surface have a Mohs' hardness of at least 6.0.

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