Wurtzite boron nitride has been found in small quantities on meteors that have landed on earth and is not commercially available. Initial investigation of the wurtzite form suggested it was potentially 18% stronger than diamond. But as only small quantities have been found, verification of this has not been able to be conclusively proved. Cubic boron nitride has a crystal structure similar to that of diamond with similar properties. Cubic boron nitride is commercially available and is used in applications to replace diamond. It’s hardness is its key property. Hexagonal boron nitride is readily commercially available. In solid form, it can be made in large billets. The solid material can withstand high temperatures whilst having good electrical properties and withstand aggressive molten metals. Unlike the wurtzite and cubic forms, the material is relatively soft. Precision Ceramics has over 30 years of experience working with hexagonal forms of boron nitride available in various grades.