High-Purity Alumina Conical Tubes | Combustion & Thermocouple Protection | 99% Al₂O₃

These High-Purity Alumina Conical Tubes are manufactured from high-purity Al₂O₃ (>99%) using a precision slip-casting process, ensuring excellent density, uniformity, and smooth interior and exterior surfaces. They are engineered for long-term use at temperatures up to 1600°C, providing superior resistance to thermal shock, corrosion, and chemical attack.

Commonly used as combustion tubes or thermocouple protection tubes, they offer reliable performance in laboratory and industrial high-temperature applications.

Available Dimensions (Ø×Length×Wall Thickness):

• 47 × 10 × 2 mm

• 98 × 19.5 × 2 mm

Package Includes: 1 pc/pack

Precautions for Using 99% Alumina Components

1. Pre-drying: Before first use, heat at approximately 105°C for 120 minutes to remove moisture.

2. Avoid direct flame: Do not use gasoline, acetylene, or alcohol torches to prevent cracking from uneven heating.

3. Maintain clearance: Keep at least 2 cm between the component and heating elements (carbon tubes, SiC rods, heating wires, etc.).

4. Controlled heating/cooling:

   • Below 1200°C: ≤5°C/min

   • Above 1200°C: ≤4°C/min

   • Avoid sudden temperature changes or power-off cooling.

5. Proper placement: For large components, avoid direct contact with the furnace floor. Use corundum or alumina plates to elevate them, improve airflow, and extend service life.