Alumina ceramic insulator parts are high-purity Al₂O₃ components used to electrically isolate conductors from metal structures under high temperature and voltage. Produced as bushings, sleeves, standoffs, spacers, rings and terminal supports, they are applied in industrial furnaces, heating equipment, power electronics, high-voltage cabinets, welding systems and automation fixtures.
Alumina Ceramic Insulator Parts Benefits
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Stable dielectric performance under high temperature
Alumina ceramic insulator parts maintain dielectric strength in the order of tens of kV/mm and high resistivity even near red-heat conditions, helping to keep insulation clearances safe in heaters, kilns and power cabinets. -
Mechanical rigidity and dimensional stability
The dense alumina body resists creep and deformation at elevated temperature, keeping bolt holes, slots and creepage distances within tolerance over long service life. -
Geometry flexibility for complex assemblies
Components can be produced as thick-wall bushings, thin spacers, long standoffs or shaped insulating blocks, allowing engineers to integrate electrical insulation and mechanical support in a single ceramic part. -
Wear and erosion resistance around live conductors
Alumina ceramic insulator parts withstand abrasion from clamping hardware, wire movement and occasional contamination better than many polymeric insulating parts in hot, dusty or chemically active environments. -
Compatibility with high-voltage and high-frequency systems
With low dielectric loss and stable permittivity, alumina insulators are suitable for power electronics, high-voltage test rigs and RF heating equipment where electrical field distribution must remain predictable.
Alumina Ceramic Insulator Parts Properties
| Property | Unit | 96% Al₂O₃ | 99% Al₂O₃ | 99.5% Al₂O₃ | 99.6% Al₂O₃ | 99.7% Al₂O₃ | 99.8% Al₂O₃ | 99.9% Al₂O₃ | 99.99% Al₂O₃ |
| Alumina content | % | 96 | 96 | 99.5 | 99.6 | 99.7 | 99.8 | 99.9 | 99.99 |
| Density | g/cm³ | 3.6-3.75 | 3.83 | 3.89 | 3.91 | 3.92 | 3.93 | 3.94 | 3.98 |
| Color | – | white | Ivory | Ivory | Ivory | Ivory | Ivory | Ivory | Ivory |
| Water absorption | % | 0 | 0 | – | 0 | 0 | 0 | 0 | 0 |
| Young’s modulus (Elastic modulus) | GPa | 0 | 0 | 375 | 356 | 357 | 358 | 359 | 362 |
| Shear modulus | GPa | – | – | 152 | – | – | – | – | – |
| Bulk modulus | GPa | – | – | 228 | – | – | – | – | – |
| Poisson’s ratio | – | – | – | 0.22 | – | – | – | – | – |
| Compressive strength | MPa | 1910 | 2210 | 2600 | 2552 | 2554 | 2556 | 2558 | 2570 |
| Flexural strength | MPa | 260 | 300 | 379 | 312 | 313 | 314 | 315 | 320 |
| Fracture toughness | MPa·m¹ᐟ² | – | – | 4 | – | – | – | – | – |
| Hardness | GPa | 14.5 | 17 | 17 | 23 | 24 | 25 | 26 | 30 |
| Thermal conductivity | W/m·K | 22 | 24 | 35 | 32–37 | 33–38 | 34–39 | 35–40 | 36–42 |
| Thermal shock resistance ΔT | °C | – | – | – | 222 | 223 | 224 | 225 | 228 |
| Maximum use temperature (no load) | °C | 1450 | 1680 | ≤1750 | 1755 | 1760 | 1765 | 1770 | 1800 |
| Coefficient of thermal expansion | 10⁻⁶/°C | 7.6 | 7.6 | 8.4 | – | – | – | – | – |
| Volume resistivity | Ω·cm | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ |
| Dielectric constant (relative permittivity) | – | 9.2 | 9.5 | 9.8 | 9.83 | 9.84 | 9.85 | 9.86 | 9.92 |
| Dielectric strength | kV/mm | 15 | 19 | 16.9 | 23.2 | 23.4 | 23.6 | 23.8 | 24 |
| Dissipation factor (loss factor @ 1 kHz) | – | – | – | 0.0002 | – | – | – | – | – |
Alumina Insulator Parts Specifications
Type 1: Round Alumina Plate
| Round Alumina Plate | |||
| Item no. | Diameter(mm) | Thickness(mm) | Purity |
| AT-AM1-001 | 100 | 20 | 96%-99% |
| AT-AM1-002 | 90 | 5.5 | 96%-99% |
| AT-AM1-003 | 80 | 14.5 | 96%-99% |
| AT-AM1-004 | 70 | 7.5 | 96%-99% |
| AT-AM1-005 | 60 | 4.5 | 96%-99% |
| AT-AM1-006 | 50 | 6 | 96%-99% |
| AT-AM1-007 | 40 | 5 | 96%-99% |
| AT-AM1-008 | 30 | 4 | 96%-99% |
Type 2: Alumina Ceramic Cushion
Type 3: Alumina Ceramic Clip
Type 4: Aluminum Oxide Heat Sink
Type 5: Aluminum Oxide Connector
Type 6: Aluminum Oxide Column
Type 7: Alumina Install Ceramic Strips
Type 8: Alumina Install Ceramic Block
Type 9: Alumina Ceramic Sleeve I
Type 10: Alumina Ceramic Sleeve II
Type 11: Alumina Ceramic Seat
Type 12: Alumina Ceramic Terminal Support Insulator
Type 12: Alumina Ceramic Support Bottle
Type 12: Alumina Ceramic Wiring Seat
Alumina Ceramic Insulator Parts Packaging
- Each part or matched set is individually wrapped with soft protective material to avoid direct ceramic-to-ceramic contact and prevent edge chipping during transit.
