The capacity of resisting a hard object pressed into its surface is called as hardness in physics. And tungsten copper rod hardness is the basic indicator to evaluate the materials if soft or hard.

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Tungsten copper rod hardness can be divided into scratch hardness, indentation hardness and rebound hardness. Scratch hardness: Mainly used to compare the hardness of minerals, the method is selected from the soft end of a hard rod end, it will be measured along the rod across the material, soft and hard material being tested is determined according to the position of scratches (the hard draws a long scratch and the soft draws a short scratch);

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