Alumina is the most-used technical ceramic in industrial production. We stock 95%, 99%, and 99.7% purity grades — covering everything from cost-sensitive wear-resistant linings to semiconductor-clean components. ISO 9001 certified with lot-specific test certs on every shipment.
Properties below are typical ranges for our standard production grades, measured at room temperature unless noted. Custom compositions and densities available — contact our engineering team with your spec.
| Property | Unit | 95% Al₂O₃ | 99% Al₂O₃ | 99.7% Al₂O₃ |
|---|---|---|---|---|
| Density | g/cm³ | 3.70 | 3.85 | 3.92 |
| Hardness (HV) | Vickers | 1450 | 1700 | 1800 |
| Flexural Strength | MPa | 300 | 360 | 400 |
| Compressive Strength | MPa | 2000 | 2100 | 2200 |
| Fracture Toughness | MPa·m½ | 3.5 | 4.2 | 4.5 |
| Max Service Temp | °C | 1500 | 1650 | 1700 |
| Thermal Conductivity | W/m·K | 20 | 27 | 30 |
| Thermal Expansion (RT–1000°C) | ×10⁻⁶/K | 7.5 | 7.8 | 8.0 |
| Dielectric Strength | kV/mm | 10 | 13 | 14 |
| Volume Resistivity (20°C) | Ω·cm | 10¹³ | 10¹⁴ | 10¹⁵ |
| Surface Finish (as ground) | Ra μm | 0.4 | 0.3 | 0.2 |
Higher purity costs more but isn't always needed — most industrial wear and insulation jobs run fine on 95% or 99%. Save 99.7% for jobs where particle contamination or chemical inertness actually matters.
The cost-effective choice when bulk wear resistance matters more than chemical purity. Standard for grinding media, wear-resistant pump liners, and low-voltage electrical insulators.
Our default workhorse. Used for heating rod substrates, structural components, lab thermocouple sheaths, and standard industrial electrical insulators. Sweet spot of performance and cost.
For semiconductor wafer processing, ICP-OES spectral analysis, ultra-pure lab crucibles, and high-voltage isolators. The cleanest standard grade we make — custom 99.9% available on request.
Across our 42 export markets, alumina components ship into these eight application categories most often. Each entry lists the grade we typically supply for that use.
Alumina heating tubes and rods for lab furnaces, industrial process heating, and tube furnace heating elements. Max continuous service temperature 1650°C.
High-purity alumina crucibles and tubes for analytical lab work, ICP-OES atomization tubes for spectral analysis instruments, and high-temperature lab vessels.
High-purity alumina fixtures, dummy wafers, and wafer-handling components for the semiconductor industry. Low particle generation, chemically inert in HF and KOH chemistries.
Alumina valve seats, pump liners, and abrasive slurry wear components. Hardness HV 1800 outperforms hardened steel by 3× in abrasive service.
Alumina grinding balls for ball mills used in paint, coating, mineral processing, and battery slurry production. Available in 5mm to 60mm diameters.
Alumina insulators for high-voltage and high-frequency electrical applications. Dielectric strength 14 kV/mm at 99.7% purity, low loss tangent.
Alumina is the cost-effective baseline — reach for Si₃N₄, SiC, or ZrO₂ only when your duty cycle specifically exceeds what alumina can handle. Here's when alumina wins and when it doesn't.
A German analytical equipment manufacturer needed custom-geometry alumina crucibles for their ICP-OES instruments — 99.7% purity verified by independent test, lot-specific certs on every shipment. We've supplied them quarterly since 2022.
Direct answers from our application engineering team. Need a deeper dive? Email engineering@ceramitell.com with your drawing or spec.