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Ferro Silicon - Size 10 - 100mm Chemical Analysis, Values and Grade is as follows:- Silicon (Si), 70 - 75%, Min. Calcium (Ca), 1.00%, Max. Carbon (C ), 0.15%, Max. Sulphur (S ), 0.05%, Max. Aluminium (Al), 1.00% Max. Used for 1. Reduce metals from their oxides 2. Manufacture of Silicon 3. Inoculation of Iron to accelerate graphitization 4. Additive to cast iron for controlling the initial content of silicon