... 53μM40-270MESH-74μM-200MESH-44μM-325MESHPACKAGE: 99.99 silicon powder 25KG/850KG/1000KG plastic bag or as your ... , mechanical or electrical engineering, analytical chemistry, or business management. 99.99 silicon powderIn Dec 2010, Factory has successfully completed REACH (Registration ... .Depending on the grade,silicon metal contains 98.5-99.99%silicon with trace amounts of iron,calcium and aluminium. ...