High-Purity Alumina Ceramic Tube for High-Temperature & Corrosive Environments
St.Cera’s ceramic tube is manufactured from 99.8% high-purity alumina (Al₂O₃), offering excellent thermal stability up to 1600°C, high dielectric strength (15×10⁶ V/m), and superior chemical resistance. Our precision machining capabilities enable inner diameters as small as 0.2mm, outer diameters up to 600mm, and lengths up to 1500mm, with straightness of 0.005mm, concentricity of 0.01mm, and surface finish of Ra0.1. The tube’s zero porosity (0% water absorption) prevents outgassing in vacuum environments, making it ideal for semiconductor diffusion furnaces, thermocouple protection, and chemical processing. Custom wall thicknesses and end configurations (flat, tapered, flanged) are available.
Specifications (based on 99.8% Al₂O₃ & St.Cera manufacturing capabilities):
| Property | Value |
| Material | 99.8% Alumina (Ivory) |
| Density | 3.93 g/cm³ |
| Flexural Strength | 361 MPa |
| Vickers Hardness | 16 GPa |
| Dielectric Strength | 15×10⁶ V/m |
| Max Length | 1500mm |
| Max Outer Diameter | 600mm |
| Min Inner Diameter | 0.2mm |
| Straightness | 0.005mm |
| Concentricity | 0.01mm |
| Surface Finish | Ra0.1 (lapped) |
| Max Operating Temp | 1600°C |
Applications:
- · Thermocouple protection tubes for high-temperature furnaces
- · Diffusion furnace tubes in semiconductor processing
- · Chemical reactor liners and feedthroughs
- · Electrical insulation sleeves
Manufacturing Precision:
Achieved with precision grinding machines and CNC machining centers. Roundness: 0.002mm, parallelism: 0.002mm, perpendicularity: 0.005mm.
Advantages over Metal or Quartz Tubes:
- · Withstands 1600°C vs quartz’s 1100°C limit
- · No metal contamination in process environments
- · 10× longer wear life in abrasive conditions
Customization:
Custom OD/ID ratios, flanged ends, side ports, and multi-bore configurations available.
