Saint-Gobain calcined aluminas are more pure than fused aluminum oxide products with the exception of fused white aluminum oxide. When milled, however, calcined aluminas retain the chemistry of the unmilled crude more closely than fused aluminum oxide. Precision-grade calcined alumina can be used in glass and metal lapping and polishing as well as on coated abrasive tapes.
The two characteristics of calcined alumina that distinguish it from fused aluminum oxide grains are shape and purity. Calcined alumina grains are normally composed of single platey crystals, whereas fused aluminum oxide grains tend to be fractions of large crystals and blocky in shape. A calcined crystal is theoretically a six-sided disk with a thickness of about one-fifth of its diameter. Customized sizes, vehicles, and compounds are readily available.
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