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It is black and features brittle and sharp ,certain capacity od heat-transmission and electricity-transmission.The knoop’s hardness is 3100-3280kg/mm2. It can be used for making bonded and coated abrasibe tools,grinding metal and nin-metal materials of lower tensile strength,such as gray cast iron yellow bronze,aluminum,stone,leather,rubber,etc,Besides,it can asdo be used for refractory materials.
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