High-Purity White Fused Alumina WFA for Abrasive & Refractory Applications
Product Description
HUAO White Fused Alumina (WFA) is produced by fusing high-purity calcined alumina powder in an electric arc furnace at temperatures exceeding 2000°C. Characterized by a highly uniform alpha-alumina (α-Al₂O₃) crystalline structure, it exhibits superior Mohs hardness (9.0), high toughness, excellent self-sharpening capabilities, and exceptional chemical stability. HUAO supplies two standardized product lines to serve diverse industrial demands: Abrasive Grade for precision blasting, grinding, and surface finishing, and Refractory Grade for high-temperature furnace linings, monolithic castables, and structural ceramics.
Technical Parameters
Physical Properties
| Item |
Unit |
Index Value |
| Specific Gravity |
g/cm³ |
3.95 |
| Refractoriness |
°C |
1850 |
| Density |
g/cm³ |
3.6 |
| Apparent Porosity |
% |
7 |
Chemical Composition
| Type |
Specification / Grain Size |
Al₂O₃ (%) |
Na₂O (%) |
SiO₂ (%) |
Fe₂O₃ (%) |
| Particle |
0-1mm, 1-3mm, 3-5mm, 5-8mm |
99.4 |
0.3 |
0.08 |
0.08 |
| Powder |
200 mesh, 325 mesh |
99.2 |
0.35 |
0.1 |
0.1 |
Key Features
Electric arc furnace fusion above 2000°C develops a dense α-Al₂O₃ crystal network, ensuring high mechanical strength and thermal stability. Featuring a Mohs hardness of 9.0 and good fracture toughness, WFA continually exposes sharp new cutting edges during grinding and abrasive blasting. Maintains volume stability and load-bearing strength in ultra-high temperature applications, preventing premature structural collapse. Low silica (SiO₂ ≤ 0.08-0.1%) and low iron (Fe₂O₃ ≤ 0.08-0.1%) content protect against liquid slag penetration and chemical corrosion. Supplied in granular sizes (0-1mm to 5-8mm) for coarse refractory aggregates and fine micro-powders (200 mesh, 325 mesh) for high-density matrix packing.
Applications
Abrasive Grade Applications
Used for dust-free metal preparation, scale removal, and glass etching.
Key raw material for high-speed grinding wheels, cutting discs, and mounted points.
Applied in manufacturing high-durability sandpapers, abrasive belts, and flap discs.
Ideal for optical glass, semiconductor wafers, and stainless steel finishing.
Added as a functional filler to enhance wear resistance in epoxy coatings and composite floors.
Refractory Grade Applications
Used in high-performance ladle linings, tundishes, and iron runners.
Suitable for glass melting tanks, regenerators, and petrochemical cracking furnaces.
Forms saggers, batts, and burner blocks needing high thermal shock performance.
Acts as a durable aggregate in unshaped castables exposed to thermal abrasion.
Why Choose HUAO
Our electric arc furnace melting process guarantees complete recrystallization and uniform grain density across every production batch. Advanced screening and air classification equipment ensure narrow particle size distribution for both granular aggregates and fine powders. Direct manufacturing ensures continuous supply capacity, direct cost savings, and reliable international maritime shipping logistics.
Customization
HUAO provides customizable grain size distributions (FEPA, JIS, or custom mesh sizes) to fit exact client process setups. Export packaging options include 25kg multi-layer paper bags and 1000kg/1200kg heavy-duty bulk bags equipped with inner polyethylene moisture barriers, fully palletized and shrink-wrapped for international transport.
FAQ
Q1: Are HUAO manufacturing facilities certified under international quality standards?
A1: Yes, HUAO operates in strict compliance with certified ISO 9001, ISO 14001, and ISO 45001 management systems, conducting thorough chemical analysis and physical property testing on every production lot.
Q2: What is the primary difference between Abrasive Grade and Refractory Grade WFA?
A2: Abrasive Grade focuses on particle sharpness, friability, and toughness for cutting and surface finishing. Refractory Grade emphasizes high thermal resistance (1850°C), low porosity (7%), and chemical resistance against slag and metal erosion.
Q3: What particle sizes are available for White Fused Alumina?
A3: We supply granular sizes including 0-1mm, 1-3mm, 3-5mm, and 5-8mm, as well as fine powders in 200 mesh and 325 mesh specifications. Custom sizes can also be prepared upon request.
Q4: How does the chemical purity of WFA support high-temperature applications?
A4: With Al₂O₃ content reaching up to 99.4% and low silica/iron impurities (≤ 0.08%), WFA minimizes low-melting phase formation, retaining high mechanical strength at elevated temperatures.
We also provide other alumina products. If you would like to learn more about Tabular Alumina, please click here.
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