White Fused Alumina (WFA)
Electro-fused from high-purity Bayer process alumina powder at 2,250°C in dedicated arc furnaces. Featuring ≥99.5% Al2O3 purity, ultra-low Na2O (≤0.25%), and virtually zero iron (≤0.05%). Designed for precision vitrified grinding wheels, stainless steel & aerospace sandblasting, optical/semiconductor lapping, and high-purity refractories.
Smelting Precision & Grain Morphology Control
Industrial abrasive performance depends on crystal phase purity, bulk density (LPD), and zero oversize contamination. At our Gongyi smelting and sizing complex, every ton of White Fused Alumina (WFA) undergoes controlled fusion, impact shaping, and high-Gauss magnetic extraction.
Minimized Beta-Alumina Phase & High True Density
Excess sodium oxide (Na2O) forms soft beta-alumina (Na2O·11Al2O3), reducing hardness and refractory refractoriness. Our long-arc fusion process volatilizes excess alkali, achieving ≥99.5% alpha-Al2O3 purity and true density ≥3.95 g/cm³.
Self-Sharpening Cleavage for Heat-Sensitive Steels
Higher Knoop microhardness and controlled crystal friability allow WFA grains to micro-fracture under grinding pressure—continuously exposing fresh, razor-sharp cutting edges without burning hardened tool steels, gears, or aerospace alloys.
Zero Ferrous Contamination for Medical & Stainless Media
Processed through alumina-lined crushers and multi-stage magnetic separators to guarantee iron-free purity for stainless steel blasting, titanium medical implant texturing, and cleanroom wafer polishing.
Chemical Composition & Physical Parameters
Verified by in-house XRF fluorescence spectrometry and W.S. Tyler Ro-Tap mechanical sieve analysis. A signed Certificate of Analysis (COA) accompanies every shipment.
Available Grit Sizes & Particle Distribution Matrix
Precision-classified across multi-deck vibrating screens and air/water elutriation lines to meet strict international FEPA, JIS, and ASTM sieve tolerances.
| Grade / Classification | Available Size Range | Nominal Micron (µm) | Governing Standard | Primary Industrial Applications |
|---|---|---|---|---|
| FEPA F Macro Grits | F16, F20, F24, F36, F46, F60, F80, F100, F120, F150, F180, F220 | 1,400 µm – 53 µm | FEPA 42-1:2006 | Precision vitrified tool & gear grinding wheels, non-ferrous blasting |
| FEPA Micro Powders | F240, F280, F320, F400, F500, F600, F800, F1000, F1200 | 44.5 µm – 3.0 µm | FEPA 42-2:2006 | Medical implant micro-blasting, ceramic investment casting shells |
| JIS Precision Powders | JIS #240, #400, #600, #800, #1000, #1500, #2000, #3000, #4000 | 57.0 µm – 3.0 µm | JIS R6001:2017 | Silicon wafer lapping, optical glass polishing, whetstones |
| Refractory Aggregate | 0–0.5 mm, 0–1 mm, 1–3 mm, 3–5 mm, 5–8 mm | 500 µm – 8,000 µm | ISO / GB/T 2479 | High-purity corundum castables, purge plugs, sliding gate plates |
| Refractory Fine Powders | 180#, 200#, 325# (95% passing) | < 90 µm / < 45 µm | ASTM E11 Sieve | High-alumina refractory matrix, technical ceramic sintering |
Engineered for Heavy Industrial Performance
Consistent chemical purity and controlled grain geometry make our White Fused Alumina (WFA) a trusted raw material for global grinding tool, blasting, and refractory manufacturers.
4-Stage Metrology Lab Inspection & Batch Traceability
Every production lot is tested in our ISO 9001:2015 Gongyi laboratory before bagging. No shipment leaves our warehouse without a verified Certificate of Analysis.
X-Ray Fluorescence Chemical Analysis
Quantitative verification of primary crystal content and trace oxides (Fe2O3, SiO2, Na2O, TiO2) per GB/T and ISO analytical standards.
Ro-Tap Sieve & Laser Diffraction
Macro grits are tested on W.S. Tyler Ro-Tap sieve shakers; micro-powders are analyzed via Malvern laser diffraction for D10/D50/D90 accuracy.
Bulk Density (LPD) & Magnetic Check
Loose packed density, true specific gravity, moisture (<0.2%), and residual magnetic iron are measured to guarantee lot-to-lot consistency.
Signed COA & 12-Month Sample Retention
Each batch receives a traceable barcode and signed COA. A sealed 500g reference sample is archived in our lab for 12 months.
Moisture-Proof Export Packaging & Container Loading
Engineered to prevent bag tearing, moisture ingress, and pallet shifting during long-haul ocean freight from Qingdao, Tianjin, or Shanghai ports.
Frequently Asked Questions
Key technical parameters, grit sizing standards, and export logistics for White fused alumina abrasive.
What is the chemical purity of Fengtai White Fused Alumina?
Our White Fused Alumina is electro-fused from high-grade Bayer process alumina in high-temperature arc furnaces. Typical Al2O3 content is ≥99.2% to 99.5%, with Na2O ≤0.3% and Fe2O3 ≤0.05%, guaranteeing ultra-low iron contamination on critical workpieces.
Why choose White Fused Alumina over Brown Fused Alumina for sandblasting?
White Fused Alumina is virtually iron-free, eliminating rust spots or ferrous cross-contamination on stainless steel, aluminum, brass, aerospace alloys, and medical implants. It is also slightly harder (Mohs 9.0) and self-sharpening during blasting.
What grit sizes are available for precision polishing and micro-finishing?
In addition to macro grits (F12 to F220), we produce high-precision micro powders from F240, F280, F320 up to F1200, as well as JIS #2000, #3000, #4000 with narrow particle distribution for optical glass, semiconductor, and technical ceramic lapping.
How is White Fused Alumina packaged for international sea freight?
Standard packaging is 25kg multi-layer PP/PE moisture-proof bags, packed 40 bags into a 1-ton jumbo bag, or palletized on fumigated ISPM-15 wooden pallets with waterproof shrink wrapping for safe oceanic transport.
Request Quote & Free Samples
Submit your required specs. Our technical sales engineers respond within 4 hours during business days.