... control 2.Professional producer with 2 factories 3.Low B&PSilicon metal:Grade:553/441/421/3303/2502/2202Size:10-100mm ... than ten years.We can produce high purity of all grade Silicon Metal ,such as #553,#441,#421,#3303,#2202 ... #,2502 with low P&B.Should any items interested to you,Plaase don't hesitate ... System authorized by SGS in silicon field. metallurgical grade silicone