... Usage: raw material for industries and chemicals Silicon Metal 1) 2202Si: 99.5%min, Fe: 0.2% ... max, Al: 0.2%max, Ca: 0.02%max, P: 0.004%max 2) ... Fe: 0.3%max, Al: 0.3%max, Ca: 0.03%max, P: 0.005%max 3) ... min, Fe: 0.4%max, Al: 0.1%max, Ca: 0.1%max, P: 0.005%max 4) 421Si: ... : 0.5%max, Al: 0.2%max, Ca: 0.1%max, P: 0.005%max 5) 553Si: ... 98.5%min, Fe: 0.5%max, Al: 0.5%max, Ca ...