Calcined Alumina is a high-purity Calcined Alumina powder designed for precision polishing, advanced ceramics, refractories, and electronic materials. BanlanChem is a professional Manufacturer, Supplier, and Factory offering stable quality, tight particle-size control, and reliable Wholesale supply for global buyers.
Contents
- Product Overview
- Key Features & Advantages
- Applications
- Grades & Particle Size
- Typical Technical Specifications
- Processing & Surface Options
- Packaging & Logistics
- Quality & Traceability
- How to Choose Calcined Alumina
- FAQ
- Related Products & Articles
- Contact the Manufacturer
Product Overview
Calcined Alumina (α-Al2O3) is produced by calcining aluminum hydroxide or precursor alumina under controlled temperature to form stable alpha phase with low soda and low loss on ignition. Our Calcined Alumina powder features consistent hardness, high whiteness, and excellent chemical stability. It flows well, disperses well, and sinters predictably across different forming methods.
If you need to compare calcined alumina with other alumina grades before purchasing, see our full product range here: Alumina Powder Product Series.
If you work with different alumina materials and want a quick comparison of all major grades, you can check our full guide here: Types of Alumina – Grades, Properties & Applications.
Key Features & Advantages
- High purity: Low Na2O and low Fe content for clean firing and bright surfaces.
- Stable α-phase: Predictable sintering and high-temperature stability.
- Controlled PSD: Narrow particle size distribution for smooth polishing and dense ceramics.
- Good flow & dispersion: Improves packing and consistency in mixing.
- High hardness: Suitable for abrasive and lapping processes.
- Reliable supply: Manufacturer direct with Wholesale options.
Applications of Calcined Alumina Powder
1. Ceramics and Advanced Ceramics
Calcined alumina serves as a fundamental raw material for producing spark plugs, cutting tools, and wear-resistant ceramics. Its fine particle size and high density ensure strength and durability.
2. Refractories
Used in high-temperature furnace linings, castables, and bricks. Its resistance to heat and corrosion makes it ideal for harsh environments.
3. Polishing and Abrasives
Due to its hardness (9 on Mohs scale), it is a preferred material for polishing optical lenses, metals, and semiconductors.
For polishing-focused users, we also provide a detailed guide on how calcined alumina performs in metal, glass and semiconductor finishing: Calcined Alumina Polishing.
4. Catalyst Carriers
In the petrochemical industry, high-purity calcined alumina is used as a support for catalytic reactions, offering high surface area and stability.
For ultra-high density or thermal shock resistance, see related grades such as Tabular Alumina.
Grades & Particle Size
We supply multiple Calcined Alumina grades. Choose by particle size, purity, and application. Custom cuts are available from our Factory.
- Microfine: D50 ≈ 0.4–1.0 μm for precision polishing and fine ceramics.
- Fine: D50 ≈ 1–3 μm for ceramic forming and dense bodies.
- Medium: D50 ≈ 3–6 μm for refractories and general ceramics.
- Coarse: D50 > 6 μm for special blends and castables.
Typical Technical Specifications
Ordinary Calcined Alumina
High quality aluminum hydroxide as raw material, it is calcined by rotary kiln at reasonable calcine temperature. It has the advantages of high conversion rate, crystal stability, high mechanical strength, stable shrinkage rate, wear resistance, corrosion resistance and high temperature resistance.
| Brand | Chemical composition（%） | α-Al2O3 | Effective density | Primary crystal size | ||||
| Al2O3≥ | SiO2≤ | Fe2O3≤ | Na2O≤ | L.O.I≤ | %≥ | ≥ | μm | |
| AC-30 | 99.0 | 0.10 | 0.04 | 0.5 | 0.20 | 94 | 3.93 | 4±1 |
| AC-30-A | 99.0 | 0.10 | 0.04 | 0.5 | 0.20 | 93 | 3.93 | 2.5±1 |
Application: various abrasives, abrasives and various wear-resisting filler, various ceramic and refractory alumina micro powder.
| Brand | Chemical composition（%） | α-Al2O3 | Particle size | ||||
| Al2O3 ≥ | SiO2 ≤ | Fe2O3≤ | Na2O≤ | L.O.I≤ | % ≥ | μm | |
| ACG-2A | 99.0 | 0.20 | 0.04 | 0.5 | 0.25 | 93 | 3-5 |
Ordinary Fine Powder Of Calcined Alumina
Characteristics: good sintering performance, stable line shrinkage, narrow particle size and grain size distribution.
Application: refractories, refractory binder, alumina ceramics, glass raw materials, polishing raw materials.
Note: The above are typical values for reference. For your batch COA and target Calcined Alumina grade, please contact our Manufacturer team.
Processing & Surface Options
- Deagglomeration: Jet milling or classification for narrow PSD.
- Surface treatment: Optional dispersant-friendly surfaces to improve slurry stability.
- Slurry guidance: Solid loading, binder selection, and defoaming tips.
- Shaping routes: Pressing, tape casting, slip casting, extrusion, and 3D binder-jet guidance.
- Firing windows: Support with pilot firing curves based on target density.
Packaging & Logistics
- Standard packs: 25 kg paper bags with PE liner.
- Palletized: 40 bags/pallet (1,000 kg) or as requested.
- Big bags: 500–1,000 kg FIBC for Wholesale users.
- Labeling: Grade, batch, net weight, production date, QR for COA.
- Storage: Dry, cool place; keep sealed to avoid moisture uptake.
Quality & Traceability
- Incoming raw material checks and calcination control charts.
- In-process PSD, whiteness, and chemistry monitoring.
- Finished goods testing with retained samples and COA.
- Traceable batches for each shipment from our Factory.
How to Choose Calcined Alumina
Match grade to process and end-use. Use this quick checklist:
- Polishing: Choose microfine D50 (0.4–1.0 μm) with narrow PSD for smooth finish.
- Ceramics: Pick fine to medium grades by density and shrinkage targets.
- Refractories: Medium to coarse grades for packing and thermal stability.
- Dielectric/Insulation: Low-soda grade with very low Fe.
- Slurry needs: Consider treated surfaces for dispersion and high solid loading.
If you need a beginner-friendly explanation, you can read our introduction article here: What Is Calcined Alumina Powder?
For flame-retardant fillers or polymer applications, you may also consider our high-whiteness ATH product: High Whiteness Aluminum Hydroxide (ATH).
Compare with Tabular Alumina (sintered, coarse, high strength) or White Fused Alumina (fused, high hardness) when you need different microstructures or cutting actions.
FAQ
What is Calcined Alumina used for?
Calcined Alumina is used in polishing, advanced ceramics, refractories, electronics, and as a high-whiteness functional filler.
How is Calcined Alumina different from Tabular Alumina?
Calcined Alumina is a fine powder with controlled PSD for polishing and ceramic bodies. Tabular Alumina is a sintered, coarse, high-density aggregate for refractories and structural ceramics.
Can I get low-soda Calcined Alumina powder?
Yes. Low-soda and ultra-low-soda options are available for electrical and high-performance ceramics.
Do you offer OEM labeling and custom packing?
Yes. As a Manufacturer and Supplier, we support OEM labels, barcodes, pallets, and big-bag Wholesale solutions.
Related Products & Articles
Contact the Manufacturer
Looking for a reliable Calcined Alumina Manufacturer and Supplier with stable Wholesale supply? Contact BanlanChem for grade selection, COA, samples, and pricing. We support OEM labels, custom PSD, and logistics to your destination. Contact us to get a quote.
