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Standard Test Method for Rockwell Hardness of Plastics and Electrical Insulating Materials
STANDARD published on 1.10.2015
Designation standards: ASTM D785-08(2015)
Publication date standards: 1.10.2015
The number of pages: 6
Approximate weight : 18 g (0.04 lbs)
Country: American technical standard
Category: Technical standards ASTM
electrical insulating materials, indentation hardness, plastic molding, plastic sheets, Rockwell alpha hardness, Rockwell hardness, Rockwell hardness number,, ICS Number Code 29.035.20 (Plastic and rubber insulating materials)
|Significance and Use|
4.1 A Rockwell hardness number is a number derived from the net increase in depth impression as the load on an indenter is increased from a fixed minor load to a major load and then returned to a minor load (Procedure A). A Rockwell alpha (α) hardness number represents the maximum possible remaining travel of a short-stroke machine from the net depth of impression, as the load on the indenter is increased from a fixed minor load to a major load (Procedure B). 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 . Procedure A (Section 11) yields the indentation of the specimen remaining 15 s after a given major load is released to a standard 10-kg minor load. Procedure B (Section 12) yields the indentation of the indenter into the specimen after a 15-s application of the major load while the load is still applied. Each Rockwell scale division represents 0.002-mm (0.00008-in.) vertical movement of the indenter. In practice, the Rockwell hardness number is derived from the following relationship:
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