Calcined alumina powder is a high-purity aluminum oxide (Al₂O₃) material made by heating aluminum hydroxide at high temperatures. It is produced through the calcination (“heating”) of alumina to various temperatures. By controlling the calcination temperatures and time, the properties of the alumina can be controlled. Calcined alumina is therefore utilized in a variety of industrial applications including Structural ceramics, Technical ceramics, Polishing compounds for plastic, metal, and glass, Fillers for Rubber and Plastics, Friction – anti slip, Refractories, Paint & Coatings and Thermal Spray Powders.
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.
Primary Selection Variables
Typically the primary variables in selecting the proper calcined alumina for your application are:
- Density of crystal: low/soft, medium, or high/hard material – determined by the degree and duration of calcination.
- Surface area: decreases with higher degree and duration of calcination.
- Soda content: decreases with higher calcination levels and chemical treatments.
- Alpha Alumina Content
- Primary Crystal Size
- Polishing grades: vary based on application and material being polished.
Key Features of BanLanChem Calcined Alumina Powder
- High purity (≥99.5%)
- Controlled particle size distribution
- Excellent thermal and mechanical properties
- Low soda and impurity content
Typical Properties
- High Hardness
- High Compression Strength
- Abrasive / Wear-Resistance
- Chemical Inertness
- High Degree of Refractoriness
- Superior Electrical Insulating Properties
- Resistance to Thermal Shock
- Dielectric Properties
- High Melting Point
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.
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.
Why Choose BanLanChem as Your Supplier?
- ISO-Certified Production
- Custom specifications available upon request
- Factory-direct pricing and fast global shipping
We have over 15 years of experience producing activated alumina, tabular alumina, and related materials.
FAQ - Frequently Asked Questions
What is the difference between calcined and activated alumina?
Calcined alumina powder is fully converted to alpha-alumina and used for structural applications, while activated alumina is porous and used for adsorption and catalysis.
Can you supply customized grades?
Yes, we offer custom particle sizes, surface areas, and packaging options according to client needs.
Is BanLanChem a manufacturer or trader?
We are a direct manufacturer with a modern production facility in China, serving clients worldwide.
Contact Us
Interested in our calcined alumina powder? Contact us today to get a quote, sample, or technical datasheet.
