... you with all kinds of silicon metal like 553, 441,421,411,4405,4105, 3303,2502, 2202, 1101 etc. We ... you with all kinds of silicon metal like 553, 441,421,411,4405,4105, 3303,2502, 2202, 1101 etc. Standard ... of Silicon Metal GradeChemical composition(%) Si(≥)Impurities(≤) FeAlCa 55398.500.500.500.30 44199.000.400 ... forms are available upon customer's request. Silicon Metal 421