棕刚玉，俗名又称金刚砂，是用矾土、碳素材料、铁屑三种原料在电弧炉中经过融化还原而制得的棕褐色人造刚玉，故为此名。棕刚玉主要化学成份是 AL2O3，其含量在95.00%-97.00%，另含有少量的Fe，Si，Ti等。棕刚玉是最基本的磨料，因其磨削性能好，适用范围广，价格便宜，被广泛应用。
巴马克砂与球磨砂是制粒工艺不同的棕刚玉砂。
Barmac grains and ball milling grains are brown corundum grains from different granulating process.
棕刚玉磨料以铝矾土为主要原料经高温熔炼而成。
Corundum abrasive with bauxite as the main raw material formed at high temperature melting.
棕刚玉是以铝矾土等为原料，经高温熔炼结晶而成。
Brown aluminium oxide Brown aluminium oxide is fused and crystallized under high temperature from a mixture of bauxite and other and other raw materials.
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