Package/Shore Hardness Tester are used to check the hardness of yarn packages such as cone, beam, etc. Hardness may be defined as a materials resistance to permanent indentation. The tester is typically used to measure the hardness in polymers, elastomers and rubbers. There are several scales of durometers, used for materials with different properties. The two most common scales, using slightly different measurement systems are the ASTM D2240 type A and type D scales
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