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Scope: The Rockwell Hardness test is a hardness measurement based on the net increase in depth of impression as a load is applied. Higher numbers indicate harder materials. Test Procedure: A standard specimen is placed on the surface of the Rockwell Hardness tester.
A minor load is applied and the gauge is set to zero. The major load is applied by tripping a lever. After 15 seconds the major load is removed. The specimen is allowed to recover for 15 seconds and then the hardness is read off the dial with the minor load still applied. Specimen size: A standard specimen of 6. The higher the number in each scale, the harder the material. R and M scales are commonly used with plastics.
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Rockwell Hardness ASTM D785, ISO 2039
Historical Version s - view previous versions of standard. More D Indenters are round steel balls of specific diameters. Rockwell hardness numbers are always quoted with a scale symbol representing the indenter size, load, and dial scale used. This test method is based on Test Methods E
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