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Fused Quartz Reaction Tube — Closed End, Round Bottom

Fused Quartz Reaction Tube — Closed End, Round Bottom

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High-purity fused quartz reaction tube with one open end and a rounded closed bottom, intended for high-temperature laboratory work, small-scale material processing and controlled-atmosphere experiments.

The closed-end construction is suitable for applications requiring sample containment within a quartz tube, including thermal treatment, reaction studies and vacuum ampule preparation. Standard sizes cover outer diameters from 10 to 40 mm, with several wall thicknesses and lengths available to suit different experimental setups.

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  • Dimensions (OD × ID × Length, mm)

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This range of closed-end fused quartz tubes is intended for laboratory applications where the sample or reaction zone must remain contained within the tube. The rounded bottom provides a continuous closed end, while the opposite side remains open for sample loading, connection to suitable laboratory fittings or subsequent sealing. Standard dimensions cover compact reaction tubes from 10 to 40 mm OD.

Key Features

✓ High-purity fused quartz construction
✓ One open end with rounded closed bottom
✓ Suitable for high-temperature laboratory work
✓ Low thermal expansion
✓ Standard OD from 10 to 40 mm
✓ Additional dimensions available on request

Typical Applications

• High-temperature reaction studies
• Small-scale heat treatment
• Vacuum ampule preparation
• Controlled-atmosphere experiments
• Materials and powder processing
• Laboratory thermal synthesis
Technical Specifications
Material High-purity fused quartz
Configuration One open end / one rounded closed end
Reference SiO₂ Purity 99.99–99.9997%
Appearance Clear quartz
Mohs Hardness 7
Reference Maximum Temperature 1200°C
Linear Thermal Expansion 5.5 × 10−7 K−1
Thermal Conductivity 1.4 W·m−1·K−1
Standard Sizes
OD ID Wall Length
10 mm 8 mm 1 mm 75 / 100 mm
12 mm 10 mm 1 mm 75 / 100 / 150 mm
15 mm 12 mm 1.5 mm 100 / 150 / 200 mm
18 mm 15 mm 1.5 mm 150 / 200 mm
20 mm 17 mm 1.5 mm 100 / 150 / 200 mm
25 mm 21 mm 2 mm 100 / 150 / 200 mm
30 mm 26 mm 2 mm 150 / 200 mm
40 mm 36 mm 2 mm 150 / 200 mm
Technical Notes
• Avoid rapid heating and cooling cycles that may generate excessive thermal stress.
• The closed end should be supported without concentrated mechanical loading during high-temperature operation.
• For vacuum ampule preparation or flame sealing, allow sufficient free tube length outside the heated or reaction zone.
• The tube is not supplied as a pressure-rated vessel; vacuum or pressure conditions must be evaluated for the complete experimental assembly.
Package Contents
1× High-Purity Fused Quartz Reaction Tube
Round closed end — selected OD × ID × length
Selection & Use
Select the tube diameter and length according to the sample volume, heating zone and required connection or sealing method. For flame-sealed or controlled-atmosphere work, retain sufficient free length outside the active heating zone. Other dimensions, including the omitted short-format sizes, can be supplied on request.

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