... magnesium powder, which has the granularity of 2mm-0.0035mm(10-400meshes), magnesium content of over 99. ... 5% and loose thickness of 0.1-0.75g/cm3. The product exceeds GB5149.1- ... foreign matters of Zn<0.1%, Fe<0.2%, Ca<0.15%, Mn<0.1%, Cl<0.03%, H2O<0.05%. And hydrochloric acid insolubles ... is less than 0.2%. ...