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Brown fused alumina shows blue after calcination at 1350℃ temperature. The impurities existed in the grains will be separated out & vaporized . The surface of each particle changes coarser, improves the hydrophilicity greatly. After 1350℃ calcinations ,cracks from crushing and crystal cooling proces
Brown Fused Aluminum Oxide’s higher bulk density and high hardness results in more energy being transferred to the work surface than mineral or slag abrasives, easily removing surface contamination, rust, and mill scale.
Corundum, or alpha alumina, is the most thermodynamically stable form of alumina. In fact the term corundum is generally applied when the alpha alumina has been produced by a fusion process.