使用洛氏M、L和R硬度计，用洛氏硬度计测定塑料压痕硬度的方法规范。当压头上的载荷从固定的小载荷增加到大载荷，然后返回到相同的小载荷时，洛氏硬度值由压痕深度的净增加量得出。对于蠕变和恢复率较高的材料，施加主要和次要荷载所涉及的时间因素对测量结果有相当大的影响。

Specifications of a method for the determination of the indentation hardness of plastics by means of the Rockwell hardness tester using the Rockwell M, L and R hardness scales. The Rockwell hardness number is derived from the net increase in depth of impression as the load on an indentor is increased from a fixed minor load to a major load and then returned to the same minor load. For materials having high creep and recovery, the time-factors involved in application of the major and minor loads have a considerable effect on the results of the measurements.