What are the main components used in the construction of bonded abrasives?
Abrasive grains – usually aluminum oxide or silicon carbide Bonding agent – usually a resin bond Spacing of grains within the bond – determine porosity and strength
White fused alumina FEPA grain F24-F100
White fused alumina FEPA grain F24-F100 was made from high-quality alumina by melting above 2000 in the electric arc furnace and cooling. It is white with the main crystal phase alpha-Al2O3. The white alumina produced in titling electric arc furnaces has high purity, hardness, bulk density, low porosity, good volume stability, and thermal shock resistance. As the most commonly used corundum in the industry, white fused alumina grain has a lengthy application history because of its high hardness and good self-sharpening advantages. The European FEPA (Federation of European Producers of Abrasives) is an applied particle size specification for abrasives and refractory materials. The particle size numbers are: F24, F30, f36, F40, F46, f54, F60, F70, F80, f90, F100.
Introduce of white fused alumina FEPA grain F24-F100:
White Fused Alumina is from the fusion of high purity Bayer processed alumina in electric arc furnaces at about 2,050 degrees Celsius. White fused alumina has the features of well-distributed particle size composition, low magnetic substance content, high bulk density and toughness, good toughness, high cleanliness, etc. The white fused alumina is recommended for grinding high carbon steel, high-speed steel, and chilled steel. It can also work for blasting, lapping, polishing media, and laminating flooring materials.
Physical properties of white fused alumina FEPA grain F24-F100:
| Melting point(℃) | 2250 | |
| Bulk density(g/cm3) | 1.80~1.95 | |
| Mohs Hardness | 9.0min | |
| Whiteness | 85min | |
| Size | 120, 150, 180, 220 | |
Chemical composite of white fused alumina FEPA grain F24-F100:
| Items | WAS | WAN |
| Al2O3 | 99.5%min | 99.70%min |
| SiO2 | 0.10%max | 0.10%max |
| Fe2O3 | 0.10%max | 0.08%max |
| Na2O | 0.30%max | 0.10%max |
Particle distribution of white fused alumina FEPA grain F24-F100:
| FEPA SIZE | Average grain size(μm) |
| F 10 | 1700 – 2360 |
| F 12 | 1400 – 2000 |
| F 14 | 1180 – 1700 |
| F16 | 1000 – 1400 |
| F 20 | 850 – 1180 |
| F 22 | 710 – 1000 |
| F 24 | 600 – 850 |
| F 30 | 500 – 710 |
| F 36 | 425 – 600 |
| F 40 | 355 – 500 |
| F 46 | 300 – 425 |
| F 54 | 250 – 355 |
| F 60 | 212 – 300 |
| F 70 | 180 – 250 |
| F 80 | 150 – 212 |
| F 90 | 125 – 180 |
| F 100 | 106 – 150 |
White Fused Alumina（FAQ）
What is mohs hardness?
Mohs hardness (according to Friedrich Mohs, 1773 – 1839) ascribes a relative hardness value to certain known minerals on a scale ranging from 1 (talc) to 10 (diamond). Accordingly, a mineral is considered harder than another if it can scratch the latter. Please note that these values merely form an
What does the term “flow properties” mean?
The flow behaviour of powders depends on many factors. The following applies in general: Coarser, dry grain types flow easily, but the fine the grains get, the stronger is the impact of morphology and various adhesive forces on the flow behaviour: Van der Waals forces Liquid bridges Electrostatic interaction The
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 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 are the three basic raw materials used in the manufacture of coated abrasives?
Grain – a synthetic or natural abrasive; Bond – an adhesive that permanently bonds the backing to the abrasive; Backing – a backing that the abrasive is bonded to
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