Brown Fused Alumina (BFA)
Manufactured in Gongyi by electro-fusing calcined bauxite, anthracite, and iron filings at 2,250°C in tilting electric arc furnaces. Processed via Barmac impact shaping and dual-drum magnetic separation to deliver blocky, tough alpha-alumina grains for vitrified/resinoid grinding wheels, coated abrasives, sandblasting, and refractory castables.
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 Brown Fused Alumina (BFA) undergoes controlled fusion, impact shaping, and high-Gauss magnetic extraction.
Tilting Arc Furnace vs. Fixed Furnace Smelting
Unlike fixed-furnace ingots with uneven cooling fringes, our tilting electric arc furnaces pour molten alumina at 2,250°C into controlled cooling molds—yielding uniform alpha-Al2O3 crystal size, higher fracture toughness, and consistent TiO2 solid-solution levels.
Controlled Blocky & Angular Grain Geometry
Primary ingots are crushed via jaw/roller mills and shaped in Barmac vertical-shaft impactors (VSI). We tailor bulk density (LPD) to your application: high-density blocky grains for vitrified/resinoid wheels, or sharp angular grains for coated abrasive belts.
Dual-Stage 12,000-Gauss Magnetic Extraction
Every grit fraction passes through dual rare-earth permanent magnetic separators to strip ferrosilicon and free iron below 0.015%, preventing brown spots or firing blisters in ceramic-bonded grinding wheels and refractory bricks.
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 | F12, F16, F20, F24, F30, F36, F46, F60, F80, F100, F120, F150, F180, F220 | 2,000 µm – 53 µm | FEPA 42-1:2006 | Vitrified & resinoid grinding wheels, heavy-duty sandblasting |
| FEPA P Coated Grits | P16, P24, P36, P40, P60, P80, P100, P120, P150, P180, P220 | 1,320 µm – 65 µm | FEPA 43-1 / ISO 6344 | Coated abrasive belts, flap discs, fiber discs, sandpaper rolls |
| Micro Powders | F240, F280, F320, F400, F500, F600, F800, F1000, F1200 | 44.5 µm – 3.0 µm | FEPA 42-2 / JIS R6001 | Precision lapping, polishing compounds, wear-resistant floor coatings |
| Refractory Section Sands | 0–1 mm, 1–3 mm, 3–5 mm, 5–8 mm | 1,000 µm – 8,000 µm | GB/T 2478 / Custom | Iron & steel ladle castables, blast furnace runners, shaped bricks |
| Refractory Fines | 0–200 Mesh (75µm), 0–325 Mesh (45µm) | < 75 µm / < 45 µm | ASTM E11 Sieve | Refractory matrix binder, unshaped ramming mixes & mortars |
Engineered for Heavy Industrial Performance
Consistent chemical purity and controlled grain geometry make our Brown Fused Alumina (BFA) 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 Brown fused alumina abrasive.
What is the difference between Tilting Furnace and Fixed Furnace Brown Fused Alumina?
Tilting furnace (倾倒炉) BFA offers higher Al2O3 purity (≥95%), lower magnetic material content, and superior crystal toughness, making it the preferred choice for precision bonded abrasives (vitrified and resinoid wheels) and high-temperature refractory castables. Fixed furnace (固定炉) BFA offers high bulk toughness and economical pricing for heavy-duty sandblasting and surface preparation.
What grit size standards do you provide for Brown Fused Alumina?
We screen grains strictly according to international standards: FEPA 42-1:2006 (F4 to F220 for bonded abrasives and blasting, P12 to P220 for coated sandpaper), JIS R6001, and ANSI B74.12. We also supply custom refractory section sizes (0-1mm, 1-3mm, 3-5mm, 5-8mm, 200 mesh, 325 mesh).
What is your Minimum Order Quantity (MOQ) and delivery lead time?
Our standard commercial MOQ is 1 metric ton (1000kg). For testing, we provide free 1kg to 5kg trial samples (express courier freight collected). Standard full container orders (20-25 MT) ship from our Gongyi factory within 7 to 10 working days.
Do you provide a Certificate of Analysis (COA) with each batch?
Yes. Every production batch undergoes strict laboratory inspection including XRF chemical composition analysis, bulk density testing, and laser particle size distribution analysis. A certified COA and MSDS/SDS document accompany every export shipment.
Request Quote & Free Samples
Submit your required specs. Our technical sales engineers respond within 4 hours during business days.