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Brown fused alumina micro powder 320#-2000#
Brown fused alumina micro powder, also called brown aluminium oxide micro Powder, is an artificial electro-fused corundum obtained from the reduced fusion of high-quality bauxite and other raw materials in 2000℃ electric arc furnaces. Bauxite Used for producing BFA contains high Aluminium Oxide(Al2O3). After the fusion process, then cooled down and crushed(milled)into lump sizes. The lump sizes are then ground into finer grades or powders and refined by sieving equipment into different particle distribution materials for many applications. It is the perfect material manufactured explicitly for general abrasive applications in bonded abrasive tools, polishing, and sandblasting grit. It has a lower hardness and abrasive capacity than diamond, boron carbide, and silicon carbide; it is widely used for grinding ferrous materials and finishing hard materials. It is also be used as high-class refractory materials.
Physical characteristics of brown fused alumina micro powder 320#-2000#:
| Crystal Form: | Alpha-Alumina |
| True Density: | 3.95 g/cm3 |
| Hardness: | Mohs 9.0 |
| Melting Point: | 2000°C |
| Colour: | Brown |
Brown fused alumina micro powder 320#-2000# sizing test methods:
| Sizing: | FEPA Standard 42-2: 2006 |
| JIS R 6001 – 1998 | |
| Micron sizes based on Coulter Multisizer |
Brown aluminum oxide powder FEPA F – JIS – GB – ISO standard – powders/micro grits
| Available micron powder sizes | ||||||||
| China GB 2477-83 | JIS | FEPA(84) / DIN(70) | ISO(77) | |||||
| Grit No. | Standard size range(µm) | Grit No. | ds50 value (µm) | Grit No. | ds50 value (µm) | Grit No. | ds50 value (µm) | |
| Standard werte der Mikro-F-Reihe | Serigraph 5000D | |||||||
| 240 | 60.0±4.0 | P240 | 58.5±2.0 | |||||
| 280 | 52.0±3.0 | P280 | 52.2±2.0 | |||||
| W63 | 63 – 50 | 320 | 46.0±2.5 | F230/53 | 53±3.0 | 50.0±3.0 | P320 | 46.2±1.5 |
| W50 | 50 – 40 | 360 | 40.0±2.0 | F240/45 | 44.5±2.0 | 42.0±2.0 | P360 | 40.5±1.5 |
| 400 | 34.0±2.0 | P400 | 35.0±1.5 | |||||
| W40 | 40 – 28 | 500 | 28.0±2.0 | F280/37 | 36.5±1.5 | 34.5±1.5 | P500 | 30.2±1.5 |
| 600 | 24.0±1.5 | F320/29 | 29.2±1.5 | 27.7±1.5 | P600 | 25.8±1.0 | ||
| W28 | 38 – 20 | 700 | 21.0±1.3 | F360/23 | 22.8±1.5 | 21.6±1.5 | P800 | 21.8±1.0 |
| 800 | 18.0±1.0 | F400/17 | 17.3±1.0 | 16.5±1.0 | P1000 | 18.3±1.0 | ||
| W20 | 20 – 14 | 1000 | 15.5±1.0 | F500/13 | 12.8±1.0 | 12.3±1.0 | P1200 | 15.3±1.0 |
| W14 | 14-10 | 1200 | 13.0±1.0 | |||||
| 1500 | 10.5±1.0 | F600/9 | 9.3±1.0 | 9.0±1.0 | ||||
| W10 | 10-7 | 2000 | 8.5±0.7 | |||||
| W7 | 7-5 | 2500 | 7.0±0.7 | F800/7 | 6.5±1.0 | 6.3±1.0 | ||
| W5 | 5 – 3.5 | 3000 | 5.7±0.5 | F1000/5 | 4.5±0.8 | 4.5±0.8 | ||
| F1200/3 | 3.1±0.5 | 3.1±0.5 | ||||||
| for general purposes | for general purposes | for bonded abrasives | for coated abrasives | |||||
Brown Fused Alumina（FAQ）
How is fused alumina obtained?
Raw materials containing aluminium oxide are electrothermally melted at a reaction temperature of more than 2,000 °C to produce the various fused aluminas. Different starting materials are used depending on the desired type of fused alumina. For instance, bauxite is used for the manufacture of brown and semi-friable fused alumina,
What is a mesh vs. Grit size?
If you take a (1) inch space and add wires to it, the number of openings within the 1″ space is defined as mesh. For example, if the 1″ space has ten openings for particles to fall through, then that sieve would be called a 10 mesh sieve. Typical sieve
What is the specific weight?
The specific weight is the ratio of the weight of a body to its volume. The specific weight of corundum under normal conditions is 3.94 g/cm3.
What is porosity?
Porosity is defined as the gas proportion (cavity volume) of a particle’s total volume. It can be determined using different measurement techniques, such as gas adsorption and mercury porosimetry. With the same grain size and shape, a lower bulk density corresponds to a higher porosity of the grains.
What is the structure?
Structure is basically the spacing between abrasive grains. An open structure would be 12 or higher while a closer structure would be 6 or so. Here again, the structure depends on a variety of factors not the least of which is how difficult the material is to grind.
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