What is the difference between Rockwell and Shore Durometer?

Q. What is the difference between Rockwell and Shore Durometer?
A. Shore and Rockwell Durometer measure the resistance of plastics toward indentation. The higher the number the harder the material will be.

Shore Hardness uses either the Shore A or Shore D scale. This is scale is typically used for rubbers/elastomers and softer plastics such as polyolefins, fluoropolymers, and vinyls. The hardness value is determined by the penetration of the Durometer indenter foot into the sample. Shore A if usually used for flexible materials and Shore D is used for semi-flexible materials.

Rockwell hardness is generally chosen for 'harder' plastics such as nylon, polycarbonate, polystyrene, and acetal. The three most common scales used for plastics are Rockwell E, Rockwell M, and Rockwell R.

Article Title:
What is the difference between Rockwell and Shore Durometer?
Article Summary:
A brief explanation of the difference between Shore A and Shore D
Article Date:
5/27/2003
Article ID:
608
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