Calcined Alumina Powder (α-Al₂O₃)
Thermally converted in high-temperature rotary kilns at >1,450°C from Bayer feedstock to achieve ≥95% alpha-alumina phase conversion. Ball-milled and air-classified into ultra-fine micro-powders for technical ceramics, refractory castable matrices, and precision optical polishing.
Direct Gongyi Plant Processing & Sizing Precision
Every batch of Calcined Alumina Powder (α-Al₂O₃) is refined, crushed, magnetically separated, and precision-screened in our 35,000 m² Gongyi facility—eliminating middleman quality variation and ensuring strict adherence to international industrial standards.
Strict Raw Material Selection & Thermal Processing
Processed from selected high-grade raw ore under tightly monitored kiln/furnace temperature profiles to guarantee consistent chemical purity, specific gravity, and mechanical durability across every 20' FCL load.
Narrow Particle Size Distribution & Zero Oversize Contamination
High-frequency vibrating screens and air classification lines remove dust and oversize particles, ensuring uniform packing density and predictable industrial performance.
In-House XRF Assay & Signed COA with Every Shipment
Tested in our ISO 9001:2015 metrology lab for chemical composition, moisture, bulk density, and sieve retention prior to container sealing.
Chemical & Grading Technical Datasheet
Tested in our Gongyi plant laboratory prior to shipment. Every export container includes a batch-specific Certificate of Analysis (COA).
| Grade Designation | Al₂O₃ (%) | Na₂O (%) | Fe₂O₃ (%) | SiO₂ (%) | α-Al₂O₃ Phase | Median Particle Size (D50) |
|---|---|---|---|---|---|---|
| CA-325 Refractory Matrix Grade | ≥ 99.0% | ≤ 0.30% | ≤ 0.04% | ≤ 0.06% | ≥ 94% | 45 μm (325 Mesh) |
| CA-M5 Technical Ceramic Grade | ≥ 99.3% | ≤ 0.20% | ≤ 0.03% | ≤ 0.04% | ≥ 95% | 3.5 – 5.0 μm |
| CA-M2 Reactive / Polishing Grade | ≥ 99.5% | ≤ 0.12% | ≤ 0.02% | ≤ 0.03% | ≥ 96% | 1.2 – 2.2 μm |
Standard Seaport Export Staging
- 25kg Bags + Pallet: 40 × 25kg multi-ply moisture-proof bags shrink-wrapped on a 1,000kg ISPM-15 fumigated wooden pallet.
- 1,000kg Jumbo Bags: Heavy-duty woven PP FIBC bulk bags with top/bottom spouts and PE moisture liner.
- Container Capacity: 20 – 26 Metric Tons per 20' GP container.
- Port of Loading: Qingdao / Tianjin / Shanghai (7–10 days dispatch).
Primary Industrial Sectors & Use Cases
Engineered for reliable performance across heavy industrial manufacturing, surface preparation, and thermal processing.
Refractory Castable Matrix Fines
Improves rheological flow, reduces water addition, and promotes high-temperature mullite bonding in low-cement castables.
High-Alumina Technical Ceramics
Sintered wear tiles, spark plug insulators, electronic substrates, and ballistic armor plates requiring uniform linear shrinkage.
Precision Lapping & Polishing
Polishing compounds and slurries for stainless steel, optical glass, quartz crystals, and semiconductor wafers.
Thermal Conductive Fillers
High-purity electrically insulating filler for silicone thermal pads and epoxy potting compounds.
Frequently Asked Questions
Key technical parameters, grit sizing standards, and export logistics for Aluminum oxide powder.
Can you customize particle sizes according to our technical requirements?
Yes. Gongyi Fengtai possesses automated multi-deck sieving lines and air classification systems capable of screening custom mesh sizes, FEPA, JIS, ANSI, or proprietary buyer grain distributions.
How can I request free testing samples?
Simply fill out the inquiry form below or message our sales team on WhatsApp (+86-158-3803-2047). We arrange 1kg to 2kg trial samples dispatched worldwide via DHL/FedEx.
What are your export shipping terms and accepted payment methods?
We offer FOB Qingdao/Tianjin, CIF, CFR, and DDP shipping terms. Accepted payment methods include T/T (Telegraphic Transfer) and irrevocable Letter of Credit (L/C) at sight.
Request Quote & Free Samples
Submit your required specs. Our technical sales engineers respond within 4 hours during business days.