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%Min Fe:0.3%Max Al:0.3%Max Ca:0.03%Max
2202 Si:99%Min Fe:0.2%Max Al:0.2%Max Ca:0.02%Max
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