silicon powder with high purity 99.99%,99.95%,99.9%,99% 200mesh,325mesh D50:1.5um,D50 4-5um CNPC brand ... Chemical industry etc. STANDARD SPECIFICATION CHEMICAL COMPOSITION (%)Simore than 99.98Caless than 0.0001Feless than 0.0001Alless than 0.0002Culess ... and so on. High purity silicon powder Polysilicon powder99%,99.9% ,99.95% ,99.99%, 99.995%200mesh, 325mesh,1000mesh,3000mesh,6000mesh,average size( ...