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Alumina
The most widely used technical ceramic for electrical insulation, wear resistance, chemical stability and cost-effective production.
95%, 96%, 99%, 99.5% and 99.7%+ alumina ceramics
Technical specifications
Typical reference data for first-round screening.
Values are typical engineering references. Final material selection should confirm grade, process route, geometry, tolerance and test method.
| Density | 3.70–3.90 g/cm³ typical, purity dependent |
|---|---|
| Hardness | 15.7–17.2 GPa (converted from HV1 1600–1750) |
| Max service temperature | 1,600–1,650 °C in air, purity dependent |
| Thermal conductivity | 20–32 W/(m·K) at room temperature, purity dependent |
| Flexural strength | 300–380 MPa typical at room temperature |
| Fracture toughness | 3.5–4.0 MPa·m¹/² typical |
| Electrical behavior | Excellent electrical insulation |
Typical applications
- Insulating tubes, bushings, spacers and substrates
- Wear plates, liners, plungers and guide components
- Chemical processing parts exposed to many media
- High-volume custom ceramic components
Advantages
- Excellent balance of performance and cost
- Strong dielectric behavior across purity grades
- Good hardness and wear resistance
- Broad manufacturing availability for custom shapes
Comparison notes
- Choose alumina first when the application needs insulation and wear resistance at a controlled cost.
- Move to zirconia or silicon nitride when impact, cracking or contact stress is the main failure mode.
Application review
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