... some degree. The abrasives made of it are suitable for working on cast iron, non-ferrous metal, rock, leather, rubber, etc ... maxJIS R6001-1987Grit No.SizeFeaturesFeatures#12Colour:black Package:Paper bag on pallet or user’s request1. Black silicon carbide is ... . 3.Black crystal, hardnessBlack silicon carbide abrasives are suitable for working on cast iron, non-ferrous metal, rock, leather, rubber, etc. ...