... factories 3.Low B&PSilicon metal:Grade:553/441/421/3303/2502/2202Size:10-100mm ,90%minPacking:in 2.5kg plastic ... of all grade Silicon Metal ,such as #553,#441,#421,#3303,#2202#,2502 with low P&B.Should any items interested ... >99.4%≤0.3≤0.1≤0.03≤0.005%3303>99.3%≤0.3≤0.3≤0.03≤0.005 ... SGS in silicon field. international grade metal silicon 441/553/3303/2202/1515/2203/2503/3103/411/421/1101