Quartz Glass Tube

Product Overview

Quartz glass tube is a clear tube designed for liquid level sight glasses and tubular level gauge assemblies. Made from fused quartz (SiO₂ ≥ 99.99%), it offers better thermal stability and chemical resistance than regular borosilicate or soda-lime glass tubes. It also offers superior optical clarity.

Often known as Quartz Sight Glass Tube, Quartz Level Gauge Tube, or Fused Quartz Transparent Tube, this product is widely used in industrial equipment. It provides a reliable visual level signal, which is essential in many processes.

Material & Manufacturing Expertise

We supply industrial sight glass components to OEMs, maintenance contractors, and export distributors. We have long-term experience in quartz processing for level gauge applications.

Manufacturing Process

• High-purity electrically fused quartz raw material

• Precision tube forming and straightening

• CNC cutting to length

• Fire-polished or fine-ground tube ends

• Strict dimensional and visual inspection

Engineers design each quartz glass tube for high pressure, a tight seal, and durability, not for decoration.

Key Performance Advantages

High Temperature Capability

• Continuous working temperature: up to 1,100 °C

• Short-term exposure: up to 1200 °C

• Very low thermal expansion: 0.5 × 10⁻⁶ /K

Ideal for steam, hot water, and high-temperature chemical processes.

Chemical Resistance

• Excellent resistance to acids, alkalis, and solvents.

• Not suitable for hydrofluoric acid (HF).

• No surface reaction or clouding occurred during long-term exposure.

Optical Clarity

• Visible light transmittance: >90%

• Clear liquid interface visibility

• Stable transparency without yellowing.

Applications

Quartz glass tubes are widely used in:

• Tube-style liquid level sight glass

• Tubular level gauge assemblies

• Boiler water level indicators

• Chemical processing equipment

• Pharmaceutical reactors

• Power generation and steam systems

• Oil & gas auxiliary equipment

They work well where borosilicate glass tubes break from temperature shock or chemical damage.

Technical Specifications

Material Properties

• Property: Fused Quartz (SiO₂ ≥ 99.99%)

• Density: 2.2 g/cm³

• Softening Point: ~1680 °C

• Continuous Working Temp: ≤1100 °C

• Thermal Expansion: 0.5 × 10⁻⁶ /K

• Light Transmittance: >90%

Standard Tube Dimensions

Outer Diameter (OD)

Common industrial sizes (mm):

• Ø10

• Ø12

• Ø14

• Ø16

• Ø18

• Ø20

• Ø22

• Ø25

• Ø30

Inner Diameter (ID)

Typical wall thickness options:

• 1.5 mm

• 2 mm

• 2.5 mm

• 3 mm

• 4 mm

Wall thickness selection depends on working pressure, tube length, and mounting method.

Standard Length Options

• 150 mm

• 200 mm

• 250 mm

• 300 mm

• 400 mm

• 500 mm

• Custom lengths of up to 2000 mm

Custom cutting is available according to drawings or samples.

Pressure Reference (Typical Industrial Use)

While the final pressure rating depends on installation and protection design:

• Low-pressure systems: ≤ 1.0 MPa

• Medium-pressure systems (with protective housing): ≤ 2.5 MPa

• Higher pressures require metal protection covers or reflex/plate-type gauges.

We assist customers in engineering selection to ensure safe operation.

End Finish & Compatibility

• Fire-polished or ground tube ends

• Compatible with:

  • Graphite gaskets

  • Mica gaskets

  • PTFE sealing systems

Designed for use with metal frames and protective shields in tubular level gauges.

Why Choose Our Quartz Glass Tubes

• Direct manufacturer & industrial exporter

• Stable batch quality for long-term supply

• OEM and replacement compatibility

• Engineering support for pressure & temperature selection

• Proven supply to the chemical, power, and process industries

We focus on process safety, clarity, and durability, not consumer-grade glass tubing.

Ordering Information

To quote accurately, please provide:

• Outer diameter & wall thickness

• Required length

• Working temperature

• Working pressure

• Medium type

• Quantity & application

Technical confirmation is provided before production.

Contact Us

Email:  info@hsahglass.com
WhatsApp: 8618632879676
Website: www.hsahglass.com

For datasheets, samples, or quotations, feel free to contact us.