Alumina Zirconia is divided into three grades according to the content of ZrO2. ZrO2 10%-15% (low Zirconium alumina), 25%(medium Zirconium alumina), 40%(high Zirconium alumina) Becens could supply ZA25 and ZA40. ZA40 has less alumina content than ZA25, so its hardness is not as high, but it has good self-sharpening properties and is suitable for coated abrasives.