A 70mm tube furnace refers to a tubular heating system with an outer diameter (OD) of approximately 70 mm. It is a commonly used heating reactor in laboratories and pilot plants. It is typically equipped with quartz, corundum, or silicon carbide tubes and can be configured with single-, dual-, or triple-zone heating systems.

This diameter offers a medium capacity and strikes a balance between sample capacity, heating rate, and temperature uniformity.

Common 70mm Tube Furnace Configurations

Heating System

Resistance Wire (Fe-Cr-Al or MoSi₂) Heating

Single, Dual, or Triple Zone Configurations Available

Temperature Control Accuracy: ±1–2°C

Tube Material

Quartz Tube (Suitable for ≤1100°C, high-purity experiments, and optical transillumination)

Corundum Tube (Up to 1600°C, Corrosion-Resistant, Thermal Shock-Resistant)

Silicon Carbide Tube (Excellent Thermal Conductivity, Rapid Thermal Cycling Resistance)

Sealing Method

Stainless Steel or Aluminum Alloy Flange + O-Ring (FKM/Silicone)

Water-Cooled Flange Available (Suitable for High Temperature/Vacuum)

Atmosphere and Vacuum System

Inert Gas/Oxidizing Gas/Reducing Gas/Mixed Gas

Vacuum Pumping Up to 10⁻³ Torr (Low-Pressure Experiments)

Sample Support

Quartz Boat, Corundum Boat, Sample Basket, Push-Pull Boat

Applicable Temperature Ranges

1100°C Model: Quartz tube + resistance wire heating, suitable for general laboratory heat treatment

1300°C Model: Corundum tube + resistance wire/SiC element, suitable for ceramic sintering and metal annealing

1600°C Model: Corundum tube + MoSi₂ heating element, suitable for high-temperature material research

1800°C Model: High-purity corundum tube + SiC element, suitable for ultra-high temperature sintering