wear resistance Advanced Material Inserts Cutting Material Groups The cutting tool materials are classified by the combination The extended standard DIN ISO 513 also includes ceramic of their hardness and wear resistance characteristics. cutting materials and the superhard polycrystalline materials, boron nitride and diamond, resulting in additional identification symbols for these cutting material groups. DP Polycrystalline Diamond BN Cubic Boron Nitride CA CM Ceramics CN + CC HT Cermets Coated Hard Metal HC Uncoated Hard Metal HW toughness sub-group main group (symbol) feature HW Uncoated WC-base hard metal hard metal HT Uncoated TiC/TiN-base hard metal (cermets) HC Coated hard metal CA Al2O3-base oxide ceramics CM Composite ceramics Al2O3 + metal carbide ceramics CN Si3N4-base nitride ceramics CC Coated ceramics BL Cubic boron nitride (CBN) with low CBN content cubic boron nitride BH Cubic boron nitride (CBN) with high CBN content diamond DP Polycrystalline diamond (PCD) B166 widia.com