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nature : also known as Roche hardness. Said a hardness standards. From Rockwell (S. P. Rockwell). Using Symbolic HR said. Application of pressure to exert pressure on the method in Tsim Sha Tsui on the tougher, pressed by the test material resulting from the surface indentations. Using measured depth of the indentation hardness said. Standard greater degree, the smaller the hardness. Determination of plastic, metal and insulating materials, such as the hardness of materials. Plastic Rockwell hardness scale is as follows. Metal Rockwell hardness scale : HRA load of 60 kg to 120 ° C for the vertex of the cone diamond indentation; HRB 100 kg load to a diameter of 1.59 mm ball pressed into hardened materials; HRC load 150 to 1000 grams vertex angle of 120 ° Conical diamond indentation materials .
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