Dark Grey Spherical Passivation Mg Powder: Less consumption , short time processing, fast reaction etc ... special type steel.Specification of Dark Grey Spherical Passivation Mg Powder:2-0.21mm(10-65 meshes), 0.85- ... and other appearance of the passivation magnesium powder.Content of granularity, loose density, Mg, CaO, CaF2, MgO, P, S ... to operation procedure. Dark Grey Spherical Passivation Mg Powder