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Contact SupplierSilicon Metal 553 is a specific grade of silicon metal characterized by its chemical composition, with the numbers indicating the maximum allowable percentages of iron (Fe), aluminum (Al), and calcium (Ca) impurities, in that order.Specifically, "553" means it contains a maximum of 0.5% iron, 0.5% aluminum, and 0.3% calcium, with the remaining portion being silicon, typically at least 98.5%