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Cubic boron nitride CBN(Cubic Boron Nitride), hardness is just second to diamond, but thermal stability is better than. CBN don’t react with iron family elements. Its hardness and chemical properties makes CBN be the most desirable superabrasive crystal for grinding ferrous and other aeronautic material. CBN grinding performance depends on crystal fracture models. It has two common models: macro-fracture and micro-fracture. CBN application: Alloy Steels ( HRC>50 ) Cast Iron, Hardened tool Steel ( HRC>50 ) Super Alloys ( HRC>40 ) Stainless Steels ( HRC>50 )

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HPHT Natural polished diamond
Natural Hpht pear polished diamond
This color is G
Clarity Vs1