What Is White Fused Alumina?
White Fused Alumina (WFA), also called White Corundum, is a high-purity alumina material produced by fusing selected calcined alumina in electric arc furnaces, followed by controlled cooling, crushing, shaping, magnetic separation, and precise grading. Thanks to its very low content of iron and alkali impurities, WFA delivers a clean white appearance, high hardness, sharp cutting edges, and stable high-temperature performance—making it a preferred choice in refractory and abrasive applications.
Key Advantages
- High purity (typ. Al2O3 ≥ 99.2–99.6%) for consistent performance and color-critical applications.
- High hardness (Mohs ≈ 9.0) and angular shape for efficient grinding, lapping, and blasting.
- Low Fe2O3 & Na2O, minimizing unwanted reactions in refractory mixes and avoiding discoloration.
- Thermal stability and high refractoriness for steel/ceramic service conditions.
- Narrow particle size distribution with FEPA F/P grits and refractory fractions from 0–1 mm up to 3–5 mm and fines (200F–325F).
Applications
White Fused Alumina (WFA) is widely used across industries that demand clean, hard, and thermally robust alumina:
- Refractories: alumina-based castables, plastic mixes, gunning mixes, precast shapes, slide gates, ladle/tundish linings, kiln furniture.
- Abrasives: vitrified/ceramic-bonded wheels, resin-bonded tools, coated abrasives (sanding papers/belts), lapping and polishing powders.
- Blasting media: surface preparation for stainless steel, titanium, and non-ferrous substrates where low contamination is critical.
- Ceramics & advanced materials: wear-resistant components, spark plug parts, electronic ceramics, and special composites.
Related materials: For sintered, high-density alumina aggregates, see Tabular Alumina. For fine-particle reactive alumina powders, check Calcined Alumina and Boehmite Powder.
Technical Specifications
Custom grades are available upon request.
| Product Name | White Fused Alumina |
| Appearance | White |
| Hardness | 10.0 Mohs |
| Al2O3 | ≥99.4% |
| True Density | 3.95~4.0 g/cm3 |
| Bulk Density | 1.53~1.99 g/cm3 |
| Melting Point | 2250℃ |
| Max Service Temperature | 1900℃ |
Why Choose BanLanChem White Fused Alumina(WFA)?
- Process control: rigorous fusion, cooling, magnetic separation, and multi-stage classification for narrow PSD and minimal contaminants.
- Stable supply: mainstream grades in stock; quick production changeover for custom sizes.
- Application support: formulation suggestions for refractory mixes and abrasive bond systems.
- Quality documentation: COA per lot, MSDS, and technical data sheets.
- Packaging options: 25 kg paper/plastic bags, PE inner liner; 1,000 kg jumbo bags; palletized and shrink-wrapped.
White Fused Alumina(WFA) vs. Other Alumina Materials
White Fused Alumina vs. Brown Fused Alumina (BFA): WFA provides higher purity and lower iron, giving cleaner color and less contamination risk. It cuts sharply and is preferred in stainless and precision grinding. BFA, with slightly higher toughness and lower cost, is suitable for heavy-duty stock removal and general-purpose blasting.
White Fused Alumina vs. Tabular Alumina: For high-density refractory aggregates, Tabular Alumina (sintered α-Al2O3) offers very low porosity and high bulk density. WFA is fused and crushed, offering angular morphology and sharp edges; often used together with tabular in advanced castables to balance flow, packing, and hot strength.
White Fused Alumina vs. Calcined Alumina/Boehmite: Calcined Alumina and Boehmite are fine powders engineered for reactivity and sintering characteristics in binders/matrices. WFA primarily contributes skeletal structure, abrasion resistance, and thermal stability.
Recommended Grades by Use
- Refractory castables & precast: 0–1 mm, 1–3 mm, 3–5 mm with fines (200F–325F) for optimized particle packing; combine with tabular alumina and reactive powders.
- Bonded abrasives: FEPA F12–F220 with controlled shape for wheel strength and cutting rate.
- Coated abrasives: FEPA P24–P220 for sanding papers/belts; tight PSD improves surface finish.
- Blasting media: angular grits in the 12–120 mesh range for stainless/titanium; low-iron media reduces after-cleaning.
- Polishing & lapping: 200F–325F micronized fines for final finishing of metals and ceramics.
Handling, Packaging & Storage
WFA is supplied in moisture-protected bags or jumbo sacks. Store in a dry, ventilated area away from contamination sources. For best performance in refractories, keep fines sealed to maintain flow and water demand consistency. Material Safety Data Sheet (MSDS) is available upon request.
FAQs
Is WFA compatible with stainless steel surface preparation?
Yes. Its low iron contamination and sharp angular shape make it ideal for stainless, non-ferrous alloys, and titanium blasting or pre-coating preparation.
Do you supply custom blends or narrow cuts?
Yes. We offer customized blends and narrow bands to meet specific rheology, surface finish, or cutting rate targets. Contact our technical team with your spec sheet.
Can WFA replace tabular alumina entirely in castables?
Not usually. A hybrid approach—combining Tabular Alumina aggregates with WFA and reactive powders—often yields the best flow, packing density, and hot strength balance.
What documentation is provided?
COA, MSDS, and—upon request—PSD curves, magnetic content reports, and trial recommendations for your application.
Request a Quote / Technical Support
Tell us your target application, preferred size (e.g., 0–1 mm, 1–3 mm, F46, P60, 200F–325F), and any special limits for Fe2O3/Na2O/PSD. Our team will recommend the right grade and packing.
Looking for a trusted white fused alumina supplier with consistent quality and competitive pricing? Contact BANLANCHEM today for more information and pricing.Get a Free Quote
