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553 Si 98.5% min Fe: 0.5% max Al: 0.5% max Ca:0.30%max 441 Si 99% min Fe: 0.4% max Al: 0.4% max Ca:0.10%max 3303 Si 99.3% min Fe: 0.3% max Al: 0.3% max Ca:0.03%max 2202 Si 99.5% min Fe: 0.2% max Al: 0.2% max Ca:0.02%max