Hardness Rockwell M of Plastics
Hardness qualifies the resistance to permanent indentation of a material. Rockwell M hardness is a standardized test which consists in measuring the depth of penetration of a polished steel ball pressed at the surface of a plastic under controlled conditions. The higher the value, the harder the material. Rockwell Hardness measures are dimensionless.
Rockwell Hardness test is generally used for hard materials, like PA, PC, PS or POM, where the resilience or creep of the polymer is less likely to affect results. Different Rockwell Hardness scales utilize different size of steel balls and different loads. The three most common scales used for plastics are Rockwell E, Rockwell M, and Rockwell R.
Test methods used to measure Rockwell Hardness M are ASTM D785 and ISO 2039-2.
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