1.With high strength,corrosion resisance,good wear resistance 2.certified by ISO9001:2008 quality system Chemical Composition %ElementSi3N4SiNFEContent90-9758-6036-391-285-9059-6134-361-280-9559-6132-341-2SIZE: 10-50MM 0-400meshACCORDING TO CUSTERMOERS REQUIRMENTS TO PRODUCTION Silicon Nitride