This is a special coating based on both Boron Nitride and Non Boron Nitride chemistries used for the protection of cast iron, steel tools in contact with molten aluminium. It's most common application is in protecting pouring ladles in pressure or gravity die casting foundries since it has wetting properties. It is higly resistant to thermal shock and affords extended corrosion resistance.
Non wetting properties
High resistance to thermal shock
Extended corrosion resistance