A alumina fundida castanha é um produto fabricado pela redução gradual da fusão de bauxite calcinada num forno elétrico de arco a alta temperatura (aproximadamente 2000 graus Celsius). A sua composição química é constituída principalmente por Al 2 O 3 (94,5-97%) e por quantidades vestigiais de TiO 2 , SiO 2 , Fe 2 O 3 , CaO e MgO.
O Óxido de Alumínio Castanho é caracterizado por uma boa tenacidade, elevada resistência mecânica e dureza (9 na escala de Mohs). A microdureza do material atinge cerca de 1900kG/mm 2 . A massa específica (densidade) é igual a 3,90+/-0,05 g/cm 3 . A densidade aparente em função do tamanho é igual a 1,52-1,87 g/cm 3 . Possui uma condutividade térmica relativamente elevada e uma baixa expansão térmica. Em relação à eletricidade, é um isolante.
| Alumina fundida castanha JIS 360# | |
| Composição química | Percentagem |
| Al2O3 | ≥94,0% |
| Fe2O3 | ≤0,5% |
| Em 2 O | ≤0,30% |
| SiO2 | ≤1,50% |
| TiO2 | 1,5-3,8% |
| Alto | ≤0,30% |
| Índice físico-químico | |
| Densidade aparente | 1,53-1,99 g/cm3 |
| Densidade de grãos | 3,90 g/cm3 |
| Dureza Morse | 9 |
Os pós de óxido de alumínio fundido castanho são o material perfeito, fabricado especificamente para utilização em aplicações abrasivas gerais em ferramentas abrasivas aglomeradas e processos de lapidação e polimento. Embora o óxido de alumínio tenha menor dureza e capacidade abrasiva do que o diamante, o carboneto de boro e o carboneto de silício, é amplamente utilizado para retificar materiais ferrosos, dar acabamento a materiais duros e resistentes e preencher peças cerâmicas quando o custo de processamento é importante.
| Artigo | 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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