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White fused alumina micro grits powder FEPA & JIS using the high-quality fine powder, further broken and shaped by a pipe mill and removed iron, acid pickling and moisture by magnetic separation. White fused alumina micro grits are produced by the grinding & classification of selected Macro grain feedstock in advanced milling and classifying facility. The sizes are controlled and tested using an x-ray sedimentation particle size analyzer and particle counter. Micro grits generally conform to the FEPA (Federation of European Producers of Abrasives) specifications. Also, the plant supplies JIS and other customer-specific sizes as required.
Introduce of white fused alumina micro grits powder FEPA & JIS:
White fused alumina micro-powder is a high-quality α-alumina powder as a raw material. It also has high purity, good self-sharpening, acid and alkali resistance, high-temperature resistance, thermal state performance stability, and excellent insulation. White fused alumina powder is suitable for making bonded and coated grinding tools; wet or dry, sandblasting, ultra-fine grinding and polishing in the crystal and electronic industry; and making advanced refractory materials and materials with high tensile strength. Also, it can be used as a catalyst, insulator, precision casting sand, etc. White fused alumina powder is also widely used in the emerging wood flooring industry, circuit boards, special coatings, polishing waxes, etc. Compared with ordinary micro-powder, our fine powder and ultrafine micro-powder properties are more concentrated in particle size distribution, making uniform surface and better gloss performance of polished wafer.
Physical properties of white fused alumina micro grits powder FEPA & JIS:
| Melting point(℃) | 2250 | |
| Bulk density(g/cm3) | 1.80~1.95 | |
| Mohs Hardness | 9.0min | |
| Whiteness | 85min | |
| Size | FEPA F230-F1200 & JIS #240-#10000 | |
Chemical composite of white fused alumina micro grits powder FEPA & JIS:
| Item | Al2O3 % | Fe2O3 % max | SiO2 % max | Na2O % max |
| WAM-S | 99.5 | 0.05 | 0.10 | 0.35 |
| WAM-A | 99.7 | 0.05 | 0.10 | 0.06 |
Particle distribution of white fused alumina micro grits powder FEPA
| FEPA SIZE | Average grain size (μm) | ||
| ds3 (μm) max | ds50 (μm) | ds94 (μm) min | |
| F 230 | 77 | 55.7 ± 3.0 | 38 |
| F 240 | 68 | 47.5 ± 2.0 | 32 |
| F 280 | 60 | 39.9 ± 1.5 | 25 |
| F 320 | 52 | 32.8 ± 1.5 | 19 |
| F 360 | 46 | 26.7 ± 1.5 | 14 |
| F 400 | 39 | 21.4 ± 1.0 | 10 |
| F 500 | 34 | 17.1 ± 1.0 | 7 |
| F 600 | 30 | 13.7 ± 1.0 | 4.6 |
| F 800 | 26 | 11.0 ± 1.0 | 3.5 |
| F 1000 | 23 | 9.1 ± 0.8 | 2.4 |
| F 1200 | 20 | 7.6 ± 0.5 | 2.4 |
| Abrasives micro size distribution Japan standard JIS#240~10000 | ||||||||
| Settlement pipe particle size analysis method(μm) | Electric-resistivity grain counter method(μm) | |||||||
| ds0 | ds3 | ds50 | ds94 | ds0 | ds3 | ds50 | ds94 | |
| #240 | 127 | 90 | 60±4.0 | 48 | 127 | 103 | 57±3.0 | 40 |
| #280 | 112 | 79 | 52±3.0 | 41 | 112 | 87 | 48±3.0 | 33 |
| #320 | 98 | 71 | 46±2.5 | 35 | 98 | 74 | 40±2.5 | 27 |
| #360 | 86 | 64 | 40±2.0 | 30 | 86 | 68 | 35±2.0 | 23 |
| #400 | 75 | 56 | 34±2.0 | 25 | 75 | 58 | 30±2.0 | 20 |
| #500 | 65 | 48 | 28±2.0 | 20 | 63 | 50 | 25±2 | 16 |
| #600 | 57 | 43 | 24.0±1.5 | 17 | 52 | 41 | 20±1.5 | 13 |
| #700 | 50 | 39 | 21.0±1.3 | 14 | 45 | 37 | 17±1.3 | 11 |
| #800 | 46 | 35 | 18.0±1.0 | 12 | 38 | 31 | 14±1.0 | 9 |
| #1000 | 42 | 32 | 15.5±1.0 | 9.5 | 32 | 27 | 11.5±1.0 | 7 |
| #1200 | 39 | 28 | 13.0±1.0 | 7.8 | 27 | 23 | 9.5±0.8 | 5.5 |
| #1500 | 36 | 24 | 10.5±1.0 | 6.0 | 23 | 20 | 8.0±0.6 | 4.5 |
| #2000 | 33 | 21 | 8.5±0.7 | 4.7 | 19 | 17 | 6.7±0.6 | 4 |
| #2500 | 30 | 18 | 7.0±0.7 | 3.6 | 16 | 14 | 5.5±0.5 | 3 |
| #3000 | 28 | 16 | 5.7±0.5 | 2.8 | 13 | 11 | 4.0±0.5 | 2 |
| #4000 | 4.7±0.4 | 11 | 8 | 3.0±0.4 | 1.3 | |||
| #6000 | 8 | 5 | 2.0±0.4 | 0.8 | ||||
| #8000 | 6 | 3.5 | 1.2±0.3 | 0.6（ds75） | ||||
| #10000 | 0.8±0.2 | |||||||
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,
Abrasive grains – usually aluminum oxide or silicon carbide Bonding agent – usually a resin bond Spacing of grains within the bond – determine porosity and strength
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Centerless grinding Cylindrical grinding Foundry snagging Internal grinding Mounted point grinding Portable grinding Surface grinding Toolroom grinding
Yes, No problem, but Customer resposiable for the charge.
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