Brown Fused Alumina (F)
Brown Fused Alumina(F)
Description
Kowa’s Brown Grits are produced by the fusion of high-quality bauxite in an electric arc furnace at high temperatures. Brown Aluminum Oxide has high compression strength, high toughness, excellent self-sharpening, low coefficient of thermal expansion and cleanliness. Vitrified ranges are with medium Titania, blocky shape and high density. To get the kind of grains, we specially process the ingots, separate the magnetic material, and sieve the grains carefully to get a complete range of grit sizes.
Applications
Bonded Abrasives: Kowa’s blocky, tough, high-density grains are ideal for vitrified products requiring strength and durability. And less bulk density ranges are for resin bonded wheels.
Uses: grinding & lapping wheels, rice polishing, gear, crankshaft, cam and tool room wheels, mounted points, razor blades, bearings, thin, roll, and centreless wheels.
Abrasive Blasting: Available from coarse to micron sizes, Kowa Sharp grains combine hardness, toughness, and sharp edges for efficient cleaning, surface prep, and recyclability with minimal dust.
Uses: casting and valve cleaning, turbine blades, automotive parts, paint/rust removal, glass etching, granite/marble engraving, cookware coating, and more.
Refractories: Stable at high temperatures with toughness and thermal shock resistance.
Uses: crucibles, kiln furniture, furnace linings, tap holes, and ramming mass.
Physical Properties
Principal Crystalline Phase
Crystal Color
True Specific Gravity
Mohs hardness
Micro Hardness
Grinding Ability
α-Al2O3
Brown
≥ 3.90 g/cm³
≥ 9.00
HV1800-2200
≥ 0.10
Typical Chemical Analysis(F12-F46):
Al2O3 93.5-94%
TiO2 3-3.5%
SiO2 ≤2.4%
Fe2O3 ≤0.3%
Chemical Composition
ABRR For Blasting/Resinoid Wheel applications Regular Quality
| Specification | Al2O3 | SiO2 | Fe2O3 | TiO2 |
|---|---|---|---|---|
| F12-F54 | 94.00 ± 0.5% | ≤ 2.5% | ≤ 0.30% | 2.0~3.5% |
| F60-F120 | 93.00 ± 0.5% | ≤ 3.0% | ≤ 0.30% | 2.2~3.5% |
| F150-F220 | 91.00 ± 0.5% | ≤ 3.5% | ≤ 0.40% | 2.5~3.5% |
ABRH For Blasting/Resinoid Wheel applications High Quality
| Specification | Al2O3 | SiO2 | Fe2O3 | TiO2 |
|---|---|---|---|---|
| F12-F54 | 95.50 ± 0.5 % | ≤1.8% | ≤ 0.30% | 2.0~3.5% |
| F60-F120 | 94.00 ± 0.5 % | ≤ 1.8% | ≤ 0.30% | 2.2~3.5% |
| F150-F220 | 93.50 ± 0.5 % | ≤ 2.0% | ≤ 0.35% | 2.5~3.5% |
ABV For Vitrified Bonded Wheel Applications
| Specification | Al2O3 | SiO2 | Fe2O3 | TiO2 |
|---|---|---|---|---|
| F12-F54 | 95.50 ± 0.5% | ≤1.5% | ≤ 0.25% | 2.0~3.5% |
| F60-F120 | 94.50 ± 0.5% | ≤ 1.5% | ≤ 0.25% | 2.2~3.5% |
| F150-F220 | 93.50 ± 0.5% | ≤ 1.8% | ≤ 0.35% | 2.3~3.5% |
Grain Sizes Available (Macro)
F12 to F220 In accordance with the current FEPA / JIS / ANSI sieve standards. Other sizes available on request.
