Brown fused alumina is also called brown aluminium oxide.
Brown fused alumina (A) is produced by fusion of bauxite in an electric arc furnace at high temperatures. The brownish coloured product shows high hardness as well as extreme toughness. The materials are used to grind metals of high-tensile strength such as steel, annealed malleable iron and hard bronze. It can also be used as high-class refractory.
| Grain Usages and Types | ||||
| Usage | For vitrified wheels | For organic wheels | For coated abrasives | For refractory materials |
| Type | A | A-B | A-P | A-R |
| Physical Characteristics | |||||
| Item | Basic mineral | Crystal system | Crystal color | Mohs hardness | Density |
| Brown fused alumina | α- Al2O3 | Hexagonal | Brown | 9 | ≥3.90g/cm3 |
| Item | Micro hardness | Electrical resistivity | Grinding ability (compared with diamond as one) | Linear expansion coefficient (when 900℃ α•10-6k-1) | |
| Brown fused alumina | HV1800-2200 | 1014-1016Ω•cm | 0.1 | 7.6 | |
| Chemical Composition (GB/T 2478-2008) | ||||||
| Type | Grit | Chemical Composition（%, by weight） | ||||
| Al2O3 | TiO2 | CaO | SiO2 | Fe2O3 | ||
| A | F4-F80 | 95.00-97.50 | 1.70-3.40 | ≤0.42 | ≤1.00 | ≤0.30 |
| F90-F150 | 94.50-97.00 | |||||
| F180-F220 | 94.00-97.00 | 1.70-3.60 | ≤0.45 | ≤1.00 | ≤0.30 | |
| F230-F800 | ≥93.50 | 1.70-3.80 | ≤0.45 | ≤1.20 | ≤0.30 | |
| F1000-F1200 | ≥93.00 | ≤4.00 | ≤0.50 | ≤1.40 | ≤0.30 | |
| A-B | F4-F80 | ≥94.00 | 1.50-3.80 | ≤0.45 | ≤1.20 | ≤0.30 |
| F90-F220 | ≥93.00 | 1.50-4.00 | ≤0.50 | ≤1.40 | ≤0.30 | |
| F230-F800 | ≥92.5 | ≤4.20 | ≤0.60 | ≤1.60 | ≤0.30 | |
| F1000-F1200 | ≥92.00 | ≤4.20 | ≤0.60 | ≤1.80 | ≤0.30 | |
| A-P | P12-P80 | 95.00-97.50 | 1.70-3.40 | ≤0.42 | ≤1.00 | ≤0.30 |
| P100-P150 | 94.50-97.00 | |||||
| P180-P220 | 94.00-97.00 | 1.70-3.60 | ≤0.45 | ≤1.00 | ≤0.30 | |
| P240-P800 | ≥93.50 | 1.70-3.80 | ≤0.45 | ≤1.20 | ≤0.30 | |
| P1000-P1200 | ≥93.00 | ≤4.00 | ≤0.50 | ≤1.40 | ≤0.30 | |
| P1500-P2500 | ≥92.50 | ≤4.20 | ≤0.55 | ≤1.60 | ≤0.30 | |
| A-R | 0-1mm | 94.00-97.50 | 1.50-3.80 | ≤0.45 | ≤1.40 | ≤0.30 |
| 1-3mm | 94.00-97.50 | 1.50-3.80 | ≤0.45 | ≤1.40 | ≤0.30 | |
| 3-5mm | 94.00-97.50 | 1.50-3.80 | ≤0.45 | ≤1.40 | ≤0.30 | |
| 5-8mm | 94.00-97.50 | 1.50-3.80 | ≤0.45 | ≤1.40 | ≤0.30 | |
| Note: Special requirement on chemical composition can be satisfied through discussion. | ||||||
| Guarnteed bulk density range of coarse grains（A / A-B, g/cm3） | |||
| Grit | Roll Crushing | Ball Mill | BMK |
| F12 | 1.84±0.05 | 1.92±0.05 | 2.00±0.05 |
| F14 | 1.83±0.05 | 1.91±0.05 | 1.99±0.05 |
| F16 | 1.81±0.05 | 1.90±0.05 | 1.98±0.05 |
| F20 | 1.78±0.05 | 1.87±0.05 | 1.98±0.05 |
| F22 | 1.76±0.05 | 1.85±0.05 | 1.96±0.05 |
| F24 | 1.74±0.05 | 1.84±0.05 | 1.94±0.05 |
| F30 | 1.72±0.05 | 1.81±0.05 | 1.90±0.05 |
| F36 | 1.70±0.05 | 1.79±0.05 | 1.87±0.05 |
| F40 | 1.68±0.05 | 1.76±0.05 | 1.85±0.05 |
| F46 | 1.65±0.05 | 1.75±0.05 | 1.83±0.05 |
| F54 | 1.63±0.05 | 1.73±0.05 | 1.81±0.05 |
| F60 | 1.62±0.05 | 1.72±0.05 | 1.79±0.05 |
| F70 | 1.60±0.05 | 1.69±0.05 | 1.78±0.05 |
| F80 | 1.57±0.05 | 1.65±0.05 | 1.76±0.05 |
| F90 | 1.54±0.05 | 1.64±0.05 | 1.74±0.05 |
| F100 | 1.51±0.05 | 1.60±0.05 | 1.70±0.05 |
| F120 | 1.49±0.05 | 1.59±0.05 | 1.68±0.05 |
| F150 | 1.47±0.05 | 1.57±0.05 | 1.65±0.05 |
| F180 | 1.45±0.05 | 1.56±0.05 | 1.61±0.05 |
| F220 | 1.43±0.05 | 1.53±0.05 | 1.59±0.05 |
| Note: Special requirement on bulk density can be satisfied through discussion. | |||
| Guarnteed bulk density range of coarse grains（A-P, g/cm3） | |||
| Grit | Roll Crushing | Ball Mill | BMK |
| P12 | 1.80±0.05 | 1.88±0.05 | 1.96±0.05 |
| P16 | 1.78±0.05 | 1.85±0.05 | 1.94±0.05 |
| P20 | 1.76±0.05 | 1.83±0.05 | 1.93±0.05 |
| P24 | 1.73±0.05 | 1.81±0.05 | 1.92±0.05 |
| P30 | 1.70±0.05 | 1.79±0.05 | 1.90±0.05 |
| P36 | 1.68±0.05 | 1.76±0.05 | 1.88±0.05 |
| P40 | 1.65±0.05 | 1.73±0.05 | 1.86±0.05 |
| P50 | 1.62±0.05 | 1.71±0.05 | 1.83±0.05 |
| P60 | 1.59±0.05 | 1.67±0.05 | 1.81±0.05 |
| P80 | 1.57±0.05 | 1.64±0.05 | 1.77±0.05 |
| P100 | 1.55±0.05 | 1.62±0.05 | 1.73±0.05 |
| P120 | 1.52±0.05 | 1.59±0.05 | 1.70±0.05 |
| P150 | 1.49±0.05 | 1.55±0.05 | 1.66±0.05 |
| P180 | 1.47±0.05 | 1.52±0.05 | 1.62±0.05 |
| P220 | 1.45±0.05 | 1.50±0.05 | 1.58±0.05 |
| Note: Special requirement on bulk density can be satisfied through discussion. | |||
| Optional Particle Sizes | |
| Product Category | Particle Size |
| A | F12-F220, F240-F1200, JIS240#-8000# etc. |
| A-B | F12-F220, F240-F1200, JIS240#-8000# etc. |
| A-P | P12-P220, P240-P3000 etc. |
| A-R | 0-1MM, 1-3MM, 3-5MM, 5-8MM, etc. |
| Note: Special specification can be customized according to customer's requirements. | |
If you are interested in our products, you can fill in the form below and contact us. We will reply as soon as we see it. Thank you for your trust.
