White Fused Alumina Powder - Sintering Release Powder

White Fused Aluminum Oxide (WFA) - High-Purity Abrasive & Refractory Material

Premium white fused alumina manufactured through high-temperature electric arc furnace processing, offering 99.3-99.7% Al₂O₃ purity with exceptional hardness (Mohs 9.0), thermal stability (melting point 2250°C), and chemical inertness for demanding industrial applications in abrasives, refractories, and surface treatment.

Technical Specifications

High-Purity Composition & Manufacturing Excellence

White Fused Aluminum Oxide is produced through a precisely controlled electric arc furnace process at temperatures exceeding 2000°C, utilizing premium alumina raw materials to achieve exceptional purity levels of 99.3-99.7% Al₂O₃. The manufacturing process ensures consistent α-Al₂O₃ crystal structure formation, resulting in a bright white material with uniform chemical and physical properties. Our production facilities maintain strict quality control protocols to guarantee batch-to-batch consistency, with impurity levels carefully managed (Na₂O ≤0.35%, Fe₂O₃ ≤0.06%) to meet the exacting requirements of industrial applications where material purity directly impacts performance and end-product quality.

Exceptional Mechanical & Abrasive Properties

With a Mohs hardness of 9.0 and specific gravity ≥3.90 g/cm³, white fused alumina delivers superior abrasive performance for grinding, cutting, and surface finishing applications. The material's high hardness combined with controlled particle morphology provides efficient material removal rates while maintaining consistent cutting action throughout the abrasive's service life. The sharp, angular grain structure of properly processed WFA ensures aggressive cutting performance, making it particularly effective for precision grinding of hardened steels, alloy metals, and other difficult-to-machine materials where both cutting efficiency and surface finish quality are critical requirements.

Superior Thermal & Chemical Stability

White fused alumina exhibits exceptional thermal stability with a melting point of 2250°C and refractoriness up to 2100°C, making it suitable for demanding high-temperature applications including refractory linings, kiln furniture, and thermal insulation materials. The material's chemical inertness and resistance to acids and alkalis ensure long-term performance stability in corrosive environments. This combination of thermal and chemical stability makes WFA an ideal choice for refractory castables, monolithic linings, and advanced ceramic composites where both temperature resistance and chemical durability are essential performance criteria.

Controlled Particle Size & Distribution

We supply white fused aluminum oxide in precisely graded particle sizes from coarse grits for heavy stock removal to fine powders for precision polishing applications. Our advanced processing and classification technology ensures tight particle size distribution control, minimizing oversized or undersized particles that can affect application performance. This precise sizing is particularly important for bonded abrasive tools, coated abrasives, and precision surface finishing operations where consistent particle dimensions translate to predictable performance, uniform surface finishes, and optimized process efficiency.

Comprehensive Material Documentation & Compliance

All white fused alumina products are accompanied by complete technical documentation including Material Safety Data Sheets (SDS), chemical analysis certificates, and particle size distribution reports. Our materials comply with international standards including ISO 8486, FEPA standards, and various industry-specific specifications. For international trade, the appropriate HS code (typically 2818.20.00 for aluminum oxide) is provided with all shipment documentation, facilitating smooth customs clearance and regulatory compliance for our global customers.

Technical Support & Application Engineering

As an established manufacturer of white fused aluminum oxide, we provide comprehensive technical support to help customers optimize material selection for specific applications. Our technical team offers guidance on grain size selection, processing parameters, and performance optimization based on decades of industry experience. We work collaboratively with customers to develop customized solutions for challenging applications, leveraging our production flexibility to meet specific purity, particle size, and packaging requirements that align with unique operational needs and performance objectives.

White Fused Alumina Applications

Frequently Asked Questions

What is white fused alumina used for?

White fused alumina is primarily used as an abrasive material for grinding wheels, sandpaper, and blasting media, as well as a refractory material for high-temperature applications. Its high purity and hardness also make it suitable for precision polishing, surface treatment, and as a reinforcement filler in composite materials.

What is alumina powder used for?

Alumina powder, including white fused alumina, serves multiple industrial functions: as abrasive grains in grinding and polishing applications, as refractory aggregates in high-temperature linings, as polishing compounds for precision surfaces, and as raw material for advanced ceramics and composite materials requiring high hardness and thermal stability.

What is the difference between white fused alumina and brown fused alumina?

White fused alumina (WFA) has higher purity (99.3-99.7% Al₂O₃) and is brighter white in color, while brown fused alumina (BFA) contains 94-97% Al₂O₃ with titanium and iron impurities giving it a brown color. WFA offers better hardness and purity for precision applications, while BFA provides higher toughness for heavy-duty grinding at a lower cost.

What is white aluminum oxide used for?

White aluminum oxide, synonymous with white fused alumina, is extensively used in precision grinding of hardened steels, surface preparation for coatings, manufacturing of bonded and coated abrasives, refractory applications requiring high purity, and as a polishing agent for optical components and semiconductor materials where contamination must be minimized.

What particle sizes are available for white fused alumina?

White fused alumina is available in a comprehensive range of particle sizes from coarse grits (4-220 mesh) for heavy grinding to fine powders (F230-F2000) for precision polishing. Specific sizing follows both FEPA and ANSI standards, with custom sizing available to meet unique application requirements.