Brown Fused alumina is a product manufactured by gradual melting reduction of calcined bauxite in an electric arc furnace at high temperature (approximately 2000 degrees Celsius). Its chemical composition consists mainly of Al2O3 (94,5-97%) and vestigal amounts of TiO2, SiO2, Fe2O3, CaO and MgO.
Brown Aluminium Oxide is characterised by good toughness, high mechanical resistance and hardness (9 in Mohs scale). The microhardness of the material reaches about 1900kG/mm2. Specific gravity (density) equals 3,90+/-0,05 g/cm3. Bulk density depending on size equals 1,52-1,87 g/cm3. It has relatively high thermal conductivity and low thermal expansion. As regards electricity it is an insulator.
| Brown fused alumina JIS 360# | |
| Chemical Composition | Percentage |
| Al2O3 | ≥94.0% |
| Fe2O3 | ≤0.5% |
| Na2O | ≤0.30% |
| SiO2 | ≤1.50% |
| TiO2 | 1.5-3.8% |
| CaO | ≤0.30% |
| Physicochemical Index | |
| Bulk density | 1.53-1.99g/cm3 |
| Grain density | 3.90 g/cm3 |
| Morse hardness | 9 |
Brown Fused Aluminum Oxide Powders are the perfect material specifically manufactured to be used for general abrasive applications in bonded abrasive tools and lapping and polishing processes. While aluminum oxide has lower hardness and abrasive capacity than diamond, boron carbide, and silicon carbide, it is widely used for grinding ferrous materials, finishing tough and hard materials, filling up ceramic parts when the processing cost is important.
| Item | D0（um） | D3(um) | D50(um) | D94(um) |
| #240 | ＜127 | ＜103 | 57.0±3.0 | ＞40 |
| #280 | ＜112 | ＜87 | 48.0±3.0 | ＞33 |
| #320 | ＜98 | ＜74 | 40.0±2.5 | ＞27 |
| #360 | ＜86 | ＜66 | 35.0±2.0 | ＞23 |
| #400 | ＜75 | ＜58 | 30.0±2.0 | ＞20 |
| #500 | ＜63 | ＜50 | 25.0±2.0 | ＞16 |
| #600 | ＜53 | ＜41 | 20.0±1.5 | ＞13 |
| #700 | ＜45 | ＜37 | 17.0±1.5 | ＞11 |
| #800 | ＜38 | ＜31 | 14.0±1.0 | ＞9.0 |
| #1000 | ＜32 | ＜27 | 11.5.±1.0 | ＞7.0 |
| #1200 | ＜27 | ＜23 | 9.5±0.8 | ＞5.5 |
| #1500 | ＜23 | ＜20 | 8.0±0.6 | ＞4.5 |
| #2000 | ＜19 | ＜17 | 6.7±0.6 | ＞4.0 |
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