Brown fused alumina grit F-size F8-F220

Brown fused alumina grit and crystallized under high temperature from calcined bauxite, coke, and iron mixture. Brown aluminium oxide has high compression strength, toughness, excellent self-sharpening, low thermal expansion coefficient, and excellent hydrophilia and cleanliness. Due to its good toughness and high hardness, brown fused aluminium oxide is suitable for bonded abrasives such as grinding wheels and cutoff wheels, coated abrasives, lapping, polishing, sandblasting abrasives that are used for grinding metals of high-tensile strength, such as carbon steel, general-purpose alloy steel, malleable cast-iron, and hard bronze, etc. It also can be used as refractory materials.

The process of brown fused alumina grit F-size F8-F220 :
Brown fused alumina is produced from high-quality bauxite. This process is conducted via the 3500 KVA electric arc furnace at a temperature higher than 2200℃.
bauxite is broken into crushing machine — elevating– roll crusher mill– sizing —magnetic separator —fine sieve —water washing (acid washing )—package (25kg/pp bag or 25kg paper bag,40 bags/ton bag or pallet )
Our brown fused alumina covers two production lines. The F type is mainly used for producing resin cutting /grinding wheels and sandblasting. The P-type is designed for coating abrasives.

FEPA Average grain size (µm) brown fused alumina grit F-size F8-F220

F8 2000 – 2800µm
F10 1700 – 2360µm
F12 1400 – 2000µm
F14 1180 – 1700µm
F16 1000 – 1400µm
F20 850 – 1180µm
F22 710 – 1000µm
F24 600 – 850µm
F30 500 – 710µm
F36 425 – 600µm
F40 355 – 500µm
F46 300 – 425µm
F54 250 – 355µm
F60 212 – 300µm
F70 180 – 250µm
F80 150 – 212µm
F90 125 – 180µm
F100 106 – 150µm
F120 90 – 125µm
F150 63 – 106µm
F180 53 – 90µm
F220 45 – 75µm

Typical physical properties of brown fused alumina grit F-size F8-F220

Hardness 9 Mohs
Grain shape angular
Melting point 2050 °C
Specific gravity 3.9 – 4.1 g/cm3
Bulk density 1.5 – 2.1 g/cm3

Typical chemical analysis of brown fused alumina grit F-size F8-F220

Al2O3 95.65 %
TiO2 2.42 %
Fe2O3 0.12 %
SiO2 0.92 %
CaO 0.35 %

Brown Fused Alumina(FAQ)

What is the shelf life of fused aluminum oxide?

fused aluminum oxide products do not have a known shelf life. As long as the product is maintained in the original sealed container and stored in a cool, dry, ventilated area, our product will last indefinitely

Amount of abrasive applied:

This decision is made by knowing the type of material you will be working with. Open Coat – Here, the abrasive granules cover from 50% – 70% of the backing and are set at pre-determined spacing to reduce loading. Used on softer surface materials that tends to load or fill

What’s lead time for bulk order?

1)for 5~25 tons, it takes around 10~15days. 2)For 26~200 tons,20-40days We will try to deliver it with the promise of quality guarantee as soon as possible

What is your sample policy?

We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and the courier cost. 

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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