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Fused Silica Capillary Tubes SiO2 Ultra-Fine Biomedical Semiconductor
Λεπτομέρειες:
| Place of Origin: | China |
| Μάρκα: | ZMSH |
| Model Number: | tube |
Πληρωμής & Αποστολής Όροι:
| Minimum Order Quantity: | 2 |
|---|---|
| Τιμή: | 10 USD |
| Packaging Details: | customize cartons |
| Delivery Time: | 2-4 weeks |
| Payment Terms: | T/T |
| Supply Ability: | by case |
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Λεπτομερής ενημέρωση |
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| 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 |
Περιγραφή προϊόντων
Fused Silica Capillary Tubes SiO2 Ultra-Fine Biomedical Semiconductor
Introduction
Fused silica capillary tubes are precision-drawn hollow tubes made from high-purity amorphous silicon dioxide (SiO₂). Thanks to their excellent thermal stability, chemical resistance, and optical transparency, they are widely used in analytical instrumentation, biomedical devices, fiber optics, and semiconductor manufacturing.
These tubes feature extremely small inner diameters (ID) — often ranging from a few microns to several hundred microns — with tight dimensional tolerances and smooth internal surfaces to support high-precision fluid or gas flow.
Manufacturing Principle
Tube Formation
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Preform Preparation: A large solid quartz rod or hollow core preform is fabricated through flame hydrolysis or CVD.
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Drawing Process: Using a high-temperature furnace (typically 1800–2200°C), the preform is gradually heated and pulled into thin tubes in a controlled environment. The drawing speed and temperature are tightly regulated to achieve precise inner and outer diameters.
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Annealing & Cleaning: Post-drawing, tubes are annealed to remove residual stress, and may be chemically cleaned in acid baths to eliminate surface contaminants.
Optional Customization
Capillaries can be coated (e.g., polyimide or metal) for mechanical protection or functionalization. Ends can be flared, polished, or cut to specific lengths per application needs.
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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Precision capillary glass tubes have a wide range of applications, including liquid measurement, liquid delivery, flow restrictors, fiber optic components, laser technology, X-ray diffraction analysis, and thermocouple assemblies (typically made from sapphire).
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Micro-dose drug delivery.
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Clinical testing or sample collection.
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Hematocrit capillary tubes used for blood collection.
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Disposable "marked" glass micro-pipettes.
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Micro-pipettes designed for precise, predetermined volume dispensing (aliquoting).
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Capillary spotters used to deposit small samples onto TLC (thin-layer chromatography) plates.
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Used as the core component in fiber optic devices.
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Applied in schools, industrial labs, and the food industry to test the melting point of solid substances.
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Precision capillary tubes are also used to manufacture glass-metal electrodes, such as glass-platinum electrodes, glass-copper electrodes, and more.
FAQ
Q1: What’s the difference between fused silica and quartz?
A1: Fused silica is a non-crystalline (amorphous) form of silicon dioxide with extremely low thermal expansion and high optical clarity. Quartz may refer to natural crystalline SiO₂ or synthetically grown quartz; fused silica typically offers higher purity and better thermal shock resistance.
Q2: What is the smallest inner diameter available for capillary tubes?
A2: Commercially available fused silica capillaries can have inner diameters as small as 5–10 microns. Customized fabrication may allow for even smaller sizes under strict quality control.
Q3: Can fused silica capillaries be autoclaved or sterilized?
A3: Yes. Fused silica is highly resistant to high temperatures and can be sterilized using autoclave, dry heat, or chemical sterilization without degradation.
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