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Brown Corundum
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Brown Corundum

Brown Corundum Product Details

Brown corundum, also known as brown fused alumina, is a high-performance abrasive material produced by smelting high-quality bauxite in an electric arc furnace at temperatures exceeding 2,000°C. This process creates a dense, crystalline structure with exceptional hardness and wear resistance. Composed primarily of aluminum oxide (Al₂O₃ 95%) with trace elements of silicon, iron, and titanium, it is a versatile solution for industrial surface treatment and material processing.

Compared to other abrasives, brown corundum offers a unique balance of hardness (Mohs 9) and toughness, making it ideal for heavy-duty applications. Its self-sharpening properties ensure continuous cutting efficiency, while high thermal stability allows use in high-temperature environments.

Key Product Features

Grades: Available in coarse, medium, and fine grits (F4-F320 / 8#-220#), compliant with FEPA and Chinese standards.

Forms: Granules, powders, and customized aggregates for different equipment compatibility.

Production Process

Raw Material Selection: Premium bauxite ore is carefully selected for its high alumina content and low impurity levels.

High-Temperature Smelting: Ore is melted in an electric arc furnace to remove impurities and form a homogeneous melt.

Cooling & Solidification: The melt is rapidly cooled to form crystalline corundum blocks.

Crushing & Screening: Blocks are crushed into particles and sorted into precise grit sizes using advanced sieving technology.

Magnetic Separation: Iron impurities are removed to ensure high purity (≤0.3% magnetic content).

Quality Testing: Each batch is tested for chemical composition, hardness, and particle distribution.

Advantages & Characteristics

Exceptional Hardness & Wear Resistance:

Mohs hardness of 9 and Rockwell hardness of 82-85 HRA enable efficient material removal in grinding, blasting, and cutting applications.

Long service life reduces replacement frequency, lowering operational costs.

Self-Sharpening Performance:

Fractures under pressure to expose new sharp edges, maintaining consistent abrasion efficiency.

Thermal & Chemical Stability:

Withstands temperatures up to 2,050°C, suitable for high-speed machining and refractory applications.

Resistant to chemical corrosion, ensuring reliability in harsh environments.

Precision Grading:

Tight control over particle size distribution (±5% tolerance) ensures uniform surface finishes, from rough descaling to fine polishing.

Environmental Compliance:

Recyclable and low-dust, aligning with global sustainability standards.

Application Areas

Metal Fabrication:

Shot blasting and sandblasting for rust removal, paint stripping, and surface preparation of steel structures, ship hulls, and automotive parts.

Grinding & Polishing:

Used in bonded abrasives (grinding wheels, cutting discs) and coated abrasives (sandpaper, belts) for precision machining of metals, ceramics, and composites.

Refractory Industry:

Component in high-temperature refractories for furnaces, kilns, and foundry linings due to its thermal stability.

Waterjet Cutting:

As an abrasive medium for precision cutting of metals, glass, and stone in aerospace and construction industries.

Ceramics & Abrasive Tools:

Enhances hardness and durability in ceramic glazes and abrasive tool formulations.

Technical Specifications

Property	Specification	Test Method
Chemical Composition	Al₂O₃: ≥95%, SiO₂: ≤1.5%, Fe₂O₃: ≤0.5% TiO₂: 2-3%, CaO: ≤0.5%	XRF Analysis
Hardness	Mohs: 9, Rockwell: 82-85 HRA	ASTM E18
Bulk Density	1.78-1.85 g/cm³	ASTM C136
True Density	3.8-4.0 g/cm³	ASTM C97
Thermal Conductivity	30-35 W/m·K	ASTM E1225
Melting Point	~2,050°C	ASTM E28
Grain Size	F4-F220 (FEPA) / 8#-220# (Chinese)	ASTM E11
Magnetic Content	≤0.3%	Magnetic Separation

Grit Size Applications

Grit Range	Application Scenarios	Surface Finish (Ra)
Coarse (F8-F16)	Heavy-duty descaling, foundry cleaning	25-100 μm
Medium (F22-F80)	General grinding, shot peening	6.3-25 μm
Fine (F90-F320)	Precision polishing, abrasive tools	0.8-6.3 μm

Compliance & Standards

International: ISO 9001, CE, ASTM

Industrial: Compliant with abrasive tool and refractory industry requirements.

Why Choose Our Brown Corundum?

Quality Assurance: Strict QC processes ensure batch-to-batch consistency.

Custom Solutions: Tailored grit sizes and packaging (25kg bags, 1MT super sacks) to meet specific needs.

Global Supply Chain: Reliable logistics for timely delivery to over 50 countries.

Hot Tags

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We're well-known as one of the leading brown corundum manufacturers and suppliers in China. Please feel free to buy high quality brown corundum at competitive price from our factory. For quotation, contact us now.