棕剛玉是在電弧爐中高溫（約攝氏2000度）下，將煅燒後的鋁土礦逐漸熔融還原而製成的產品。其化學成分主要由Al 2 O 3 (94.5-97%)和少量TiO 2、SiO 2、Fe 2 O 3、CaO和MgO組成。
棕色氧化鋁具有良好的韌性、高機械強度和硬度（莫氏硬度為 9）。該材料的顯微硬度達到1900kG/mm 2左右。比重（密度）等於 3,90+/-0,05 g/cm 3。堆積密度依尺寸不同為 1.52-1.87 g/cm 3。它具有相對較高的熱導率和低的熱膨脹。就電而言，它是一種絕緣體。
| 棕剛玉 JIS 360# | |
| 化學成分 | 百分比 |
| 氧化鋁 | ≥94.0% |
| 三氧化二鐵 | ≤0.5% |
| 論2 O | ≤0.30% |
| 二氧化矽 | ≤1.50% |
| 二氧化鈦 | 1.5-3.8％ |
| 高的 | ≤0.30% |
| 理化指標 | |
| 體積密度 | 1.53-1.99克/立方厘米 |
| 顆粒密度 | 3.90克/立方厘米 |
| 莫氏硬度 | 9 |
棕剛玉粉末 是專門製造用於固結磨料工具以及研磨和拋光工藝中的一般磨料應用的完美材料。雖然氧化鋁的硬度和磨蝕能力比鑽石、碳化硼和碳化矽低，但它被廣泛用於磨削黑色金屬材料、精加工堅韌硬質材料、填充陶瓷零件（當加工成本很重要時）。
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| #240 | ＜127 | ＜103 | 57.0±3.0 | ＞40 |
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| 第 320 章 | ＜98 | ＜74 | 40.0±2.5 | ＞27 |
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| #2000 | ＜19 | ＜17 | 6.7±0.6 | ＞4.0 |
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