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RK-O |
RK-H |
RK-G |
RK-A |
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Al2O3(%) |
25��30 |
25��30 |
25��30 |
30��35 |
SiO2(%) |
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Fe2O3(%) |
65��70 |
65��70 |
60��67 |
60��65 |
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2.1 |
2.2 |
1.65 |
2.2 |
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��60 |
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