High-purity transparent fused silica tube
High Purity Clear Fused Quartz Tube with SiO₂ purity ≥99.99%. It provides exceptional long-term thermal stability for continuous service up to 1200°C. Homogeneous clear material ensures premium optical transmission, especially in the UV range, alongside remarkable resistance to acids, alkalis and chemical corrosion.
Thanks to ultra-low thermal expansion, the tube tolerates severe thermal shock and avoids cracking during rapid temperature changes. Custom dimensions are offered with uniform wall thickness, zero bubbles, inclusions and striae, and stable purity. Ideal for laboratory instruments, UV disinfection & photochemical systems, industrial high-temperature heaters, optoelectronic hardware and scientific research as a premium substrate for high-temperature, UV and corrosive environments.
Main characteristics of transparent fused silica tubes
Thermal Properties
- Thermal Expansion Coefficient(20~300℃): 5.5 × 10⁻⁷ /°C
- Max Continuous Working Temp: 1200°C; Short-term Temp: 1300°C
- Annealing Point ≈1215°C, Softening Point ≈1680°C
- Outstanding thermal shock resistance, no crack under rapid temp change
- Thermal Conductivity(20℃): 1.4 W/(m·K)
Optical Performance
- Wide transmission spectrum: Ultraviolet, visible light to near infrared
- High light transmittance, low bubble & inclusion for clear observation
- JGS2 grade balances UV transmission and cost for most industrial applications
- Optional low-OH quartz tube to reduce infrared absorption peak
- Can be used for UV lamp housing, sight glass and optical reaction chamber
Chemical Stability
- Highly resistant to nearly all mineral acids, water and organic solvents
- Only corroded by hydrofluoric acid and hot concentrated phosphoric acid
- No ion leaching, avoid contamination of high-purity process media
- Excellent resistance to atmospheric corrosion at high temperature
- Not react with most metal materials under normal heating environment
Electrical Insulation
- Extremely high resistivity at room temperature, excellent dielectric material
- Maintain good insulation performance even under high temperature over 1000°C
- Low dielectric constant and low dielectric loss at high frequency
- Suitable for electric heating equipment, high-frequency and microwave device insulation parts
Mechanical Properties
- Mohs Hardness: 5.5 ~ 6.5, higher than common glass
- Density(20℃): 2.2 g/cm³, lightweight high strength
- Compressive Strength up to 1100 MPa
- Fire polished smooth surface, easy to clean & bake
Custom Processing Compatibility
- Support flat cutting, fire polishing, drilling, bending, flange welding
- Available in small tube and large diameter tube up to OD 1000mm
- Can make closed end tube, branched tube, special shaped pipeline
- Strict dimensional tolerance control for industrial equipment matching