High-Purity Alumina Ceramic Plate – for Insulation & High-Temperature Fixtures
St.Cera’s ceramic plate is manufactured from 99.8% high-purity alumina (Al₂O₃), offering high dielectric strength (15×10⁶ V/m), thermal stability up to 1600°C, and excellent wear resistance. Plates are precision lapped to achieve flatness ≤5 μm over 100 mm and surface roughness Ra ≤0.4 μm. Available in standard thicknesses from 1 mm to 20 mm, custom sizes up to 500×500 mm. Used as electrical insulators, heater bases, chamber liners, and vacuum chuck substrates.
Specifications (based on 99.8% Al₂O₃):
| Property | Value |
| Material | 99.8% Alumina (Ivory) |
| Density | 3.93 g/cm³ |
| Flexural Strength | 361 MPa |
| Dielectric Strength | 15×10⁶ V/m |
| Specific Resistance | >10¹⁴ Ω·mm²/m |
| Thermal Conductivity | 32 W/m·k |
| Thermal Expansion (25-1000°C) | 7.2×10⁻⁶/℃ |
| Max Operating Temp | 1600°C |
| Flatness (per 100 mm) | ≤5 μm |
| Thickness Tolerance | ±0.05 mm |
| Surface Roughness | Ra ≤0.4 μm |
Applications:
- · Electrical insulation plates in high-voltage equipment
- · Heater support plates in diffusion furnaces
- · Chamber liners for CVD/PVD
- · Base plates for vacuum chucks
Advantages:
- · 0% water absorption – no outgassing in vacuum
- · Chemically inert – resistant to acids and halogens (except HF)
Customization:
Holes, cutouts, edge rounding, and metallization available.
