DeutschHow Quartz Tubes Are Made
Quartz tube manufacturing starts from high-purity quartz raw material that is melted and drawn into continuous tubing. The drawing process determines the tube's core quality parameters: OD and wall thickness consistency, concentricity, bubble content and hydroxyl (OH) level.
The Drawing Process
In industrial practice, quartz tubing is produced by melting quartz raw material at around 2000 °C and drawing the viscous melt into tube. Two main routes exist:
- Electric fusion / continuous drawing — the standard route for JGS2/JGS3 class industrial and optical tubing.
- Flame fusion — crystal melted in an oxy-hydrogen flame, typically used for higher-purity grades.
During drawing, the melt is shaped over a rotating mandrel to form the bore, and draw speed with temperature control sets OD, wall thickness and concentricity. OH content is influenced by the fusion method and processing atmosphere — relevant for high-temperature service, where high OH content lowers deformation resistance. [Our Raw Material Sources and Grade Options To Be Added]
Post-Drawing Processing
Most practical quartz tubes are not used as-drawn. We further process drawn tube by:
- Cutting to length with controlled end quality
- Bending and coil forming
- Flanging and port welding
- Fire polishing of cut edges
- CNC machining of slots, holes and threads on heavy-wall sections
See our fabrication capabilities for the full process range.
Quality Parameters We Control
- OD, ID and wall thickness within agreed tolerance
- Concentricity and bow over the tube length
- Bubble and inclusion class per grade (JGS2/JGS3)
- End-face quality after cutting
