... degree. The abrasives made of it are suitable for working on cast iron, non-ferrous metal, rock, leather, rubber, etc. ... 2%maxJIS R6001-1987Grit No.SizeFeaturesFeatures#12Colour:black Package:Paper bag on pallet or user’s request1. Black silicon carbide is the ... .Black crystal, hardnessBlack silicon carbide abrasives are suitable for working on cast iron, non-ferrous metal, rock, leather, rubber, etc. ...