Brown fused alumina

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Brown fused alumina F60 F70 F80 F90

Grain:
F60 - 0,212-0,425
F70 - 0,180-0,355
F80 - 0,150-0,300
F90 - 0,125-0,250

Chemical composition:
Al2O3 – 47-70%
Fe2O3 – 1,5%
TiO2 – 1,2%
CaO – 18%

Brown fused alumina F36 F40 F46 F54

Grain:
F36 - 0,5-0,6
F40 - 0,30-0,70
F46 - 0,30-0,60
F54 - 0,20-0,50

Chemical composition:
Al2O3 – 47-70%
Fe2O3 – 1,5%
TiO2 – 1,2%
CaO – 18%

Brown fused alumina F20 F22 F24 F30

Grain:
F20 - 1,0-1,18
F22 - 0,85-1,0
F24 - 0,71-0,85
F30 - 0,6-0,71

Chemical composition:
Al2O3 – 47-70%
Fe2O3 – 1,5%
TiO2 – 1,2%
CaO – 18%

Brown fused alumina F12 F14 F16

Grain:
F12 - 1,7-2,0
F14 - 1,4-1,7
F16 - 1,18-1,4

Chemical composition:
Al2O3 – 47-70%
Fe2O3 – 1,5%
TiO2 – 1,2%
CaO – 18%

Brown fused alumina: features and use

Electrocorundum is one of the most frequently used abrasives, it is in demand in various industries in large volumes. If you want to reduce production costs and get a quality product at a dealer price, contact our company. We are a manufacturer, it is possible to deliver large batches in a short time. Delivery by our transport or pickup.

What is a brown fused alumina?

Bown fused alumina - is an abrasive with a color from light brown to dark brown. By composition, it is a crystalline aluminum oxide containing from 4% to 7% of third-party impurities, usually iron, chromium, silicon oxides. Among all types of manufactured electric corundums, it is most often used as the most affordable. It has sufficient hardness, strength and abrasive properties for processing most grades of steel and other materials.

Brown fused alumina is produced directly from bauxite, and not pure alumina, by electric melting. In the smelting process, petroleum coke or anthracite is added as a reducing agent, and metal chips are added as a precipitator. After solidification and cooling, the electrocorundum is ground in special mills, sorted into different fractions, from powder with particles of 5-7 microns to grains with a diameter of up to 2 mm. The industry produces several brands: 12A, 13A, 14A, 15A, 16A. The higher the grade, the lower the impurity content and the higher the hardness.
This material has high mechanical strength and hardness, as it contains 47-70% Al2O3, 1.2% TiO2, and ~30% other components. Its microhardness is 1250-2000 kgf/mm2, density is 3.85-3.95 g/cm3;

Physical features of brown fused alumina:

melting point: from 1650 °C;
microhardness: up to 1250-2000 kgf/mm2;
density: 3.85-3.95 g/cm3;
consumption during sandblasting: from 3 kg/m2 to 10 kg/m2.

Use of brown fused alumina

The main field of application of brown fused alumina is as an abrasive in sandblasting, the manufacture of abrasive tools: grinding, polishing, grinding wheels, bars, pastes, abrasive paper. Used for:

lapping of metal parts in mechanical engineering, watchmaking;
grinding and polishing of various grades of steels, including carbon steels, before applying a protective coating;
cleaning surfaces from paintwork, cement mortar residues, rust;
sharpening of the cutting tool;
grinding, polishing of materials with high viscosity;
polishing of wood, leather;
sandblasting (matting) of glass.

Also, brown fused alumina is added as a filler to ceramic insulators of radio tubes, high-voltage insulators for power supply networks.

Unlike quartz and other abrasive materials, corundum has a higher strength, hardness. During sandblasting, it can be reused for up to 20 cycles. If the processing technology is followed by a normal electric corundum, it is possible to obtain a surface with the specified roughness parameters, to improve the quality of adhesion of protective coatings to the substrate.

To order a brown fused alumina call or leave a request on the website. We give discounts to regular customers.

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