O óxido de alumínio castanho é fundido eletricamente num forno de arco a partir de uma mistura de bauxite a alta temperatura. Possui uma coloração castanha, elevada dureza e grande tenacidade. As ferramentas abrasivas fabricadas em óxido de alumínio castanho são adequadas para retificar aço carbono, aço de liga normal, ferro fundido maleável e bronze duro.
Grau de abrasivos:
| TAMANHO | AL2O3 MÍNIMO | SIO2 MÁXIMO | TIO2 MÁXIMO | Fe2O3 MÁXIMO |
| 12#-80# | 94,5-97% | 0,6-0,8% | 1,5-3% | 0,12-0,2% |
| 100#-180# | 93,5% | 0,7-1% | 1,5-3,8% | 0,15-0,25% |
| 240#-280# | 92% | 0,85-1,1% | 1,5-3,8% | 0,18-0,35% |
Aplicações típicas:
- aplicações coladas ou revestidas
- acabamento ou preparação de superfície
- remoção de revestimento ou incrustação
- polimento
- superfícies antiderrapantes
Adequado para estes materiais:
- aço ferroso ou de liga normal
- cerâmica
- plástico
- pedra
- copo
- madeira
- borracha
- materiais compósitos
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