... layer form silver department has no anti-virus powder in machine to have the very strong and anti-virus killing the ... industry line, seal to pack, conjunction etc., to micro-electronics machine piece of small scaled turns to rise to emphasize to ... ,Al,Si,Cr,Mn,Fe,Co,Cu,Mo,W,P,C,S. We offer at your requirement.Physical propertiesGradeParticle size/nmSpecific surface ...