棕刚玉:Fixed Brown Fused Alumina 95%,Al2O3:≧95%,比重:≧3.80 g/cm3,H2O:≦0.2%;
白刚玉:White Fused Alumina,Al2O3 ≧99.2%,H2O≦0.2%,比重≧3.50g/cm3
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