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বিস্তারিত তথ্য |
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| Density: | 2.2 g/cm³ | Compressive Strength: | 1100 MPa |
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| Flexural (Bending) Strength: | 67 MPa | Tensile Strength: | 48 MPa |
| Porosity: | 0.14–0.17 | Young’s Modulus: | 7200 MPa |
পণ্যের বর্ণনা
Introduction
A large‑diameter fused silica capillary tube is engineered to deliver high fluid throughput, robust mechanical strength, and excellent optical transparency. Typically featuring inner diameters (ID) from 300 µm to several millimeters, these tubes leverage the inherent UV–IR transparency, chemical inertness, and low thermal expansion of fused silica. As a result, this type of fused silica capillary tube excels in applications including fluidic reactors, laser beam delivery, and high‑volume analytical systems.
Manufacturing Principle
Production starts with synthetic high‑purity silica preforms drawn in temperature‑controlled (≈1,500 °C) furnaces. The drawing process yields fused silica capillary tubes with tight ID tolerances (±5 µm) and wall thickness control. A protective polyimide coating is applied immediately after drawing, providing reinforcement and resistance to pressures up to ~10,000 psi (≈689 bar) over –190 °C to +400 °C operational ranges Precision laser or CNC end‑machining enables integration of custom windowed segments or connector-ready ends without degrading the tube's optical or structural integrity.
Physical, Mechanical & Electrical Properties of Fused Quartz
| Property | Typical Value |
|---|---|
| Density | 2.2 g/cm³ |
| Compressive Strength | 1100 MPa |
| Flexural (Bending) Strength | 67 MPa |
| Tensile Strength | 48 MPa |
| Porosity | 0.14–0.17 |
| Young’s Modulus | 7200 MPa |
| Shear (Rigidity) Modulus | 31,000 MPa |
| Mohs Hardness | 5.5–6.5 |
| Short‑Term Maximum Use Temperature | 1300 °C |
| Annealing (Strain‑Relief) Point | 1280 °C |
| Softening Point | 1780 °C |
| Annealing Point | 1250 °C |
| Specific Heat (20–350 °C) | 670 J/kg·°C |
| Thermal Conductivity (at 20 °C) | 1.4 W/m·°C |
| Refractive Index | 1.4585 |
| Coefficient of Thermal Expansion | 5.5 × 10⁻⁷ cm/cm·°C |
| Hot‑Forming Temperature Range | 1750–2050 °C |
| Long‑Term Maximum Use Temperature | 1100 °C |
| Electrical Resistivity | 7 × 10⁷ Ω·cm |
| Dielectric Strength | 250–400 kV/cm |
| Dielectric Constant (εᵣ) | 3.7–3.9 |
| Dielectric Absorption Factor | < 4 × 10⁻⁴ |
| Dielectric Loss Factor | < 1 × 10⁻⁴ |
Applications
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High-throughput microfluidics: Utilized in flow reactors, sampling lines, and sensor enclosures.
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Laser/optical systems: Serve as beam passage tubes or protective windows for powerful UV–IR lasers .
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Chromatography & mass analysis: Incorporated as low-volume transfer lines in GC, LC, and GC‑MS setups
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Chemical processing: Ideal for harsh chemical media, high-temperature-lined reactors, and in-line analysis modules due to chemical resistance .
FAQ
Q1: What sizes are available?
A1: Standard IDs range from ~300 µm to several millimeters, with OD up to ~3 mm and custom lengths available
Q2: What pressure can they handle?
A2: With polyimide coating, large‑diameter fused silica capillary tubes can withstand pressures of ~689 bar and temperatures from cryogenic to +400 °C .
Q3: Can I include windowed segments or fittings?
A3: Yes—precision laser machining allows adding optical windows or connector interfaces without compromising the tube’s integrity.
Q4: How is optical transmission?
A4: Excellent—retains full UV to mid‑IR transparency (190 nm–3.6 µm), ideal for high-power optics .
Q5: Are custom coatings available?
A5: Yes—polyimide is standard; UV‑transparent or high‑temperature coatings can be customized upon request.
