Brown fused alumina sand is a brownish-red synthetic corundum abrasive produced by melting and reducing high-quality bauxite, anthracite, and iron filings in an electric arc furnace at temperatures above 2000℃. Due to its high hardness, good toughness, and excellent self-sharpening properties, it is one of the most widely used and cost-effective abrasive products globally.
We offer a long-term, stable supply of high-quality brown fused alumina sand. Our products strictly adhere to national and international standards, with particle sizes ranging from F4 to F320, as well as various grades of snd and fine powder. It is widely used in sandblasting, precision grinding, abrasive tool manufacturing, refractory materials, and wear-resistant flooring.
Bairuitong Brown Corundum Sand is made from high-grade bauxite, refined through the following core processes:
High-Temperature Smelting: Smelted at temperatures above 2250℃ in an electric arc furnace to ensure full reduction of the raw material.
Crushing and Shaping: Crushed and shaped using a self-grinding mill, resulting in mostly spherical particles with a clean, dry surface and good flowability.
Magnetic Separation for Iron Removal: Multiple magnetic separation processes remove magnetic impurities, improving purity.
Precision Sieving: Strictly sieved according to international standards, ensuring uniform particle size distribution and stable quality.
Physical and Chemical Indicators
Item
Index Parameter
Mineral Composition
Al₂O₃, trace amounts of TiO₂, SiO₂, Fe₂O₃
Al₂O₃ Content
92.5%-97% (depending on particle size)
Mohs Hardness
≥9.0
Microhardness
HV 1800-2200
True Density
≥3.90 g/cm³
Bulk Density
1.55-1.95 g/cm³ (depending on particle size)
Melting Point
2250℃
Maximum Service Temperature
1900℃
Crystal Form
Trigonal Crystal System
Color
Brown (dark blue after calcination)
Magnetic Substance Content
≤0.3% (F Series) / ≤0.2% (P Series)
Linear Expansion Coefficient
7-9×10⁻⁶/℃ (0-1600℃)
Chemical composition (classified by particle size)
Application Category
Specification
Al₂O₃ (%)
Fe₂O₃ (%)
SiO₂ (%)
TiO₂ (%)
Magnetic Substance (%)
Abrasive Tools
4# - 80#
≥95
≤1.5
≤3.0
≤3.0
≤0.30
Abrasive Tools
90# - 150#
≥94
≤1.5
≤3.0
≤3.0
≤0.30
Abrasive Tools
180# - 240#
≥93
≤1.5
≤3.5
≤3.0
≤0.30
Coated Abrasives
8# - 80#
≥95.0
≤1.2
≤3.0
≤0.5
≤0.20
Coated Abrasives
100# - 150#
≥94.0
≤1.2
≤3.0
≤0.5
≤0.20
Coated Abrasives
180# - 220#
≥93.0
≤1.5
≤3.5
≤0.5
≤0.30
Micropowder
1# - 63#
≥92.5
≤1.8
≤4.0
—
≤0.50
Chemical indicators vary depending on particle size; please refer to the product testing report for specific details.
Core Product Advantages
1.High Hardness and Outstanding Grinding Efficiency:
Brown fused alumina boasts a Mohs hardness of 9.0 and a microhardness of HV1800-2200, exhibiting toughness superior to silicon carbide. During sandblasting and grinding operations, it provides strong cutting force and rapid decontamination, significantly improving work efficiency.
2. Strong Self-Sharpening and Continuously Sharp:
Brown fused alumina possesses a unique shell-like fracture surface, continuously generating new sharp edges during grinding, maintaining sustained cutting capability. This characteristic makes it particularly suitable for long-term continuous operation scenarios, resulting in low overall operating costs.
3. High Purity and Controllable Impurities:
Depending on the particle size grade, the Al₂O₃ content can reach 92.5%-95% or higher, while the magnetic material content is controlled below 0.3%. High purity ensures stable grinding results and prevents workpiece surface contamination.
4. High Temperature Resistance and Wide Range of Applications
With a melting point as high as 2250℃ and a maximum operating temperature of 1900℃, it has a low coefficient of thermal expansion (7-9×10⁻⁶/0-1600℃). It maintains stable performance under high-temperature conditions, making it suitable for high-temperature applications such as refractory materials.
5. Environmentally Friendly and Safe
Brown fused alumina contains no free silica, eliminating the risk of silicosis and making it an ideal environmentally friendly sandblasting material.
Product Specifications
Baitong offers a complete range of brown fused alumina abrasives to meet the needs of various industries:
Main Application Areas
1. Sandblasting
Brown fused alumina is the most widely used sandblasting abrasive, suitable for:
Rust removal from steel structures, pipes, and ships (cleanliness can reach Sa2.5-Sa3 level)
Descaling and matte finishing of stainless steel/aluminum profiles
Cleaning of aluminum alloy wheels and precision molds
2. Abrasive Tool Manufacturing
As a traditional abrasive, brown fused alumina is the core raw material for many abrasive tools:
Ceramic grinding wheels, resin grinding wheels
Sandpaper, abrasive cloth, abrasive belts
Oilstones, grinding heads, grinding blocks
Polishing wax, polishing paste
3. Precision Grinding and Polishing
Grinding of optical glass and lenses
Cutting and grinding of single-crystal silicon and semiconductor materials
Polishing of watch glass, crystal products, and jade
Brown fused alumina, as a wear-resistant material, is widely used in:
Industrial plant floors, underground garages
Highway pavements, airport runways
Docks, stadiums, hospital floors
6. Functional fillers
Automotive brake components, special tire additives
Special building materials
Anti-slip coatings
7. Filter media
Using granular brown fused alumina as the bottom layer media of a filter bed, it is used to purify drinking water or wastewater. It is a new type of material for non-ferrous metal ore beneficiation and oil drilling mud weighting agents.
8. Waterjet cutting
As an auxiliary abrasive for waterjet cutting, it is suitable for cutting oil and gas pipelines, steel components, etc., with high cutting precision and smooth kerf.
