Alumina Powder (Al2O3)
High-purity alumina powder in 99.5%, 99.9% and 99.99% grades, from nano to micron particle sizes, in spherical or calcined form. Supplied for thermal spray, technical ceramics, polishing/CMP, refractories and additive manufacturing. Small quantities, prototypes and free evaluation samples are welcome.
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Tell us your grade, particle size and quantity. We typically reply within one business day.
Alumina Powder — Grades & Specifications
Alumina (aluminium oxide, Al2O3) powder is supplied across a range of purities, particle sizes and morphologies. The options below are typical; specify your target values in the request form and we will confirm availability, lead time and pricing.
| Material | Alumina / Aluminium Oxide |
|---|---|
| Chemical formula | Al2O3 |
| CAS number | 1344-28-1 |
| Purity grades | 99.5% · 99.9% · 99.99% (higher on request) |
| Particle size | Nano (sub-100 nm) to micron; target D50 specified per order |
| Morphology | Spherical, calcined, or irregular |
| Crystal phase | α-alumina (calcined); other phases on request |
| Appearance | White powder |
| Typical applications | Thermal spray, technical ceramics, polishing/CMP, refractories, additive manufacturing |
Applications by Industry
Particle Size & Mesh Conversion
Reference for converting between US mesh and microns/millimetres. Figures are nominal sieve openings and may vary slightly by standard.
Show mesh ↔ micron conversion table
| Mesh (US) | Micron (µm) | mm |
|---|---|---|
| 3 | 6730 | 6.730 |
| 4 | 4760 | 4.760 |
| 5 | 4000 | 4.000 |
| 6 | 3360 | 3.360 |
| 7 | 2830 | 2.830 |
| 8 | 2380 | 2.380 |
| 10 | 2000 | 2.000 |
| 12 | 1680 | 1.680 |
| 14 | 1410 | 1.410 |
| 16 | 1190 | 1.190 |
| 18 | 1000 | 1.000 |
| 20 | 841 | 0.841 |
| 25 | 707 | 0.707 |
| 30 | 595 | 0.595 |
| 35 | 500 | 0.500 |
| 40 | 420 | 0.420 |
| 45 | 354 | 0.354 |
| 50 | 297 | 0.297 |
| 60 | 250 | 0.250 |
| 70 | 210 | 0.210 |
| 80 | 177 | 0.177 |
| 100 | 149 | 0.149 |
| 120 | 125 | 0.125 |
| 140 | 105 | 0.105 |
| 170 | 88 | 0.088 |
| 200 | 74 | 0.074 |
| 230 | 63 | 0.063 |
| 270 | 53 | 0.053 |
| 325 | 44 | 0.044 |
| 400 | 37 | 0.037 |
| 550 | 25 | 0.025 |
| 625 | 20 | 0.020 |
| 1200 | 12 | 0.012 |
| 1250 | 10 | 0.010 |
| 2500 | 5 | 0.005 |
| 4800 | 3 | 0.003 |
| 5000 | 2.5 | 0.0025 |
| 12000 | 1 | 0.001 |
Information Required for Quotation
- Purity grade (e.g. 99.5% / 99.9% / 99.99%)
- Particle size / target D50 (micron, nano, or mesh)
- Morphology (spherical / calcined / irregular)
- Quantity
- Application environment
- Required delivery country
Frequently Asked Questions
- What purity grades of alumina powder are available?
- Alumina powder is offered in 99.5%, 99.9% and 99.99% purity grades. Other grades can be reviewed on request depending on your application and quantity.
- What particle sizes can you supply?
- Particle sizes range from nano (sub-100 nm) to micron, with the target D50 specified per order. Mesh-based requirements are also accepted; a mesh-to-micron conversion reference is provided on the page.
- Do you provide free samples of alumina powder?
- Yes. Small evaluation samples are available for qualified inquiries. Use the request form and select “Free sample” so we can review quantity and destination.
- What is the minimum order quantity (MOQ)?
- Order quantity is flexible and small quantities and prototype requests are welcome. Please state your required quantity in the form for an accurate quotation.
- Can you export and ship alumina powder internationally?
- Yes, export inquiries are welcome. Availability and shipping are reviewed based on destination country, purity grade and quantity.
- Do you provide a Certificate of Analysis (COA) or technical data?
- A Certificate of Analysis and technical data (purity, particle size distribution) can be provided on request for supplied lots.
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Request a Quote for Alumina Powder
Send us your purity grade, particle size, quantity and application. We will review availability, quotation and lead time. Small quantities, prototypes and free evaluation samples are welcome.