ASTM D785塑料和电绝缘材料洛氏硬度的标准试验方法
日期:2012-02-08 10:24
. An hardness number is equal to 150 minus the instrument reading. Due to a short overlap of Rockwell hardness scales by Procedure A, two different dial readings on different scales may be obtained on the same material, both of which may be technically correct.
For certain types of materials having creep and recovery, the time factors involved in applications of major and minor loads have a considerable effect on the results of the measurements.
The results obtained by this test method are not
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