Optical fused silica quartz tubes are precision-engineered components made from high-purity SiO₂ (≥99.99%). The
se tubes are widely used in semiconductor processing, optical systems, laboratory equipment, and high-temperature in
dustrial applications.
Our quartz tubes are free of bubbles, stripes, chipping, or scratches, and can be manufactured according to customer designs with customized inner hole shapes (round, square, or other geometries). They combine high optical transmittance, excellent chemical resistance, and superior thermal stability for demanding applications.
Key Features
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High purity SiO₂ (≥99.99%) with controlled impurity levels (2–20 ppm)
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Continuous high-temperature operation up to 1,200°C; short-term tolerance up to 1,500°C
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Exceptional thermal shock resistance due to low thermal expansion coefficient (5.5 × 10⁻⁷ /°C)
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Acid and alkali resistance, inert to all chemicals except hydrofluoric acid
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High light transmittance depending on spectrum (85–95%)
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Excellent electrical insulation and dielectric properties
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Available in diameters 20–30 mm and lengths from 10 mm to 3,000 mm
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Customized inner hole shapes (round, square, or special designs)
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Tolerance ±0.05 mm and surface roughness Ra <2 nm
Physical and Mechanical Properties
| Property | Value / Range |
|---|---|
| Hardness | 5.5–6.5 Mohs, ~570 KHN |
| Design Tensile Strength | 4.8 × 10⁷ Pa |
| Design Compressive Strength | >1.1 × 10⁹ Pa |
| Bulk Modulus | 3.7 × 10¹⁰ Pa |
| Rigidity Modulus | 3.1 × 10¹⁰ Pa |
| Young’s Modulus | 7.2 × 10¹⁰ Pa |
| Poisson’s Ratio | 0.17 |
| Coefficient of Thermal Expansion | 5.5 × 10⁻⁷ cm/cm·°C |
| Thermal Conductivity | 1.4 W/m·°C |
| Specific Heat | 670 J/kg·°C |
| Softening Point | 1,683°C |
| Annealing Point | 1,215°C |
| Strain Point | 1,120°C |
| Electrical Resistivity | 7 × 10⁷ Ω·cm (350°C) |
| Velocity of Sound | Shear: 3,750 m/s, Compression: 5,900 m/s |
| Sonic Attenuation | <11 dB/m MHz |
| Chemical Stability | High resistance to water and most acids (except HF) |
Applications
Semiconductor Industry
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Quartz cover for wafers and semiconductor devices
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Optical communication windows and covers
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Photolithography and inspection components
Optics and Photonics
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Optical glass lenses and substrates
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Custom quartz optical windows
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High-transmittance optical components
Laboratory and Analytical Equipment
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Custom reaction vessels and tubes
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Laboratory sight glasses
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Precision measurement and experimental setups
High-Temperature and Industrial Applications
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Furnace observation tubes
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Reactor tubes and protective sheaths
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UV and IR lamp housings
Customization Options
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Diameter: 20–30 mm (or custom)
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Length: 10–3,000 mm
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Inner hole shapes: round, square, or other designs
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Optical coatings available on request
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Tight tolerances: ±0.05 mm
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Surface finish: optical grade, polished or ground
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Special machining: flaring, threading, drilling, notches
FAQ
Q1: What is the MOQ?
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Standard inventory: 25 pcs
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Custom or special-shaped products: 25 pcs or more
Q2: What is the delivery time?
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Standard stock: 5 working days
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Custom products: 2–3 weeks
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Special-shaped designs: ~4 weeks
Q3: Can the tubes be customized?
Yes. Material, specifications, inner hole shapes, length, and optical coatings can all be customized to meet your requirements.
Q4: What shipping options are available?
We ship via DHL, FedEx, EMS, or customer-provided express accounts. Freight is calculated based on actual shipment.
Q5: What are the payment terms?
T/T, PayPal, secure payment, and trade assurance options are accepted.
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