... 2 factories 3.Low B&PSilicon metal:Grade:553/441/421/3303/2502/2202Size:10-100mm ,90%minPacking:in 2.5kg plastic ... than ten years.We can produce high purity of all grade Silicon Metal ,such as #553,#441,#421,#3303,#2202#,2502 ... Quality Management System authorized by SGS in silicon field. metallurgical grade silicone