... : from F12 to F3000 3,manufacturer Refractory , polishing ,abrasives material ,green silicon carbide with high quality1,sic content more then 98% 2.grit ... ,hard bronze and semi-conductor materials. The Chemical Composition of green silicon carbide:PurposeSpecificationChemical Composition(%)Magnetic material content(%)maxAbrasives gradeSICminF.CmaxFe2O3maxgrain12-80990.200 ...