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Alumina Furnace Tube Plug — Thermal Insulation

Alumina Furnace Tube Plug — Thermal Insulation

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The standard range is selected according to common laboratory furnace tube diameters from 25 to 130 mm. Plug diameter is intentionally smaller than the process-tube bore to allow straightforward insertion and removal. Because tube wall thickness and actual inner diameter can vary, the tube ID should be checked before selecting the plug size. Alternative plug diameters can be supplied where a different clearance is required.

Key Features

✓ Porous alumina thermal-insulation construction
✓ Removable cylindrical plug geometry
✓ 65 mm standard plug length
✓ Reference maximum temperature of 1300°C
✓ Compatible with common 25–130 mm furnace tubes
✓ Alternative diameters and custom sizes available on request

Typical Applications

• Laboratory tube-furnace end insulation
• Reduction of heat loss from open tube ends
• Thermal barrier between hot zone and flange area
• Quartz process-tube assemblies
• Alumina and corundum furnace tubes
• High-temperature laboratory thermal processing
Technical Specifications
Material Porous alumina insulation ceramic
Product Type Furnace tube thermal-insulation plug
Construction Porous cylindrical plug
Standard Length 65 mm
Reference Maximum Temperature 1300°C
Compatible Tube OD Range 25–130 mm
Standard Supply 2 plugs / pair
Standard Sizes
Compatible Tube OD Plug Diameter Plug Length
25 mm 18 mm 65 mm
30 mm 24 mm 65 mm
40 mm 31 mm 65 mm
50 mm 40 mm 65 mm
60 mm 52 mm 65 mm
70 mm 60 mm 65 mm
80 mm 70 mm 65 mm
90 mm 80 mm 65 mm
100 mm 90 mm 65 mm
110 mm 100 mm 65 mm
120 mm 110 mm 65 mm
130 mm 117 mm 65 mm
Technical Notes
• Verify the actual inner diameter of the furnace tube before selecting the plug size.
• The plug should enter the tube without force and with sufficient clearance for thermal expansion and removal.
• This component provides thermal insulation and is not intended to form a gas-tight or vacuum-tight seal.
• Remove or reposition the plugs only after the furnace assembly has cooled to a safe handling temperature.
Package Contents
2× Alumina Furnace Tube Insulation Plugs
One matched pair — selected plug diameter × 65 mm
Selection & Custom Sizes
Select the plug according to the actual inner diameter of the quartz, alumina or corundum process tube rather than the nominal tube OD alone. The listed tube compatibility is provided as a practical selection guide. Additional plug diameters, alternative clearances and custom lengths can be supplied on request for non-standard furnace tubes and experimental setups.

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