Sealed Bottom Tube
Material: 99.99% fused quartz glass (SiO₂)
Size: customize
Technique: cutting, polishing
MOQ: 10 pcs
Description
Features
Material:
High-purity fused quartz (99.99% SiO₂) with ultra-low trace metals.
Thermal Resistance:
Withstands temperatures up to 1,200°C (short-term) and 1,050°C (continuous use).
Optical Properties:
Excellent UV and IR transmission (∼90% transmittance at 200–2,500 nm).
Chemical Inertness:
Resistant to acids (except HF), halogens, and organic solvents.
Low Thermal Expansion:
Coefficient of 0.55 × 10⁻⁶/°C, ensuring minimal deformation under thermal stress.
Customizable:
Available in various diameters (1–200 mm), lengths (up to 1,500 mm), and configurations (sealed/vented, polished ends).
Applications
●Semiconductor Processing: CVD, diffusion furnaces, and wafer carriers.
● Photonics & Optics: Laser housings, UV lamp enclosures.
● Vacuum Systems: High-purity chambers, viewports.
● Laboratory Research: Sample encapsulation, high-temperature reactions.
● Energy: Solar cell manufacturing, quartz crucibles.
Properties
|
Physical Properties |
Values |
|
Purity |
＞99.99% |
|
Density |
2.2g/cm3 |
|
Transparency |
＞90% |
|
Mohs Hardness |
5.5--6.5 |
|
Deformation Point |
1280℃ |
|
Softening Point |
1750℃ |
|
Annealing Point |
1250℃ |
|
Specific Heat (20 - 350°C) |
670J/kg.℃ |
|
Thermal Conductivity (20°C) |
1.4W/m.℃ |
|
Heat Conductivity (w/m.k,1000 ℃ ) |
1.0-1.2 |
|
Refractive Index |
1.4585 |
|
Coefficient of Thermal Expansion |
5.5*10 -7cm/cm.℃ |
|
Hot - working Temperature |
1750--2050℃ |
|
Short - term Service Temperature |
1450℃ |
|
Long - term Service Temperature |
1100℃ |
|
Chemical Properties |
Values |
|
Acid resistant |
Strong Acid(except HF),Strong alkali, organic solution |
|
High temperatures Corrosion resistant |
Excellent |
|
Metal Impurity Content |
＜5 ppm |
|
Electrical Properties |
Values |
|
Resistivity |
7*107Ω.cm |
|
Insulation Strength |
250~400Kv/cm |
|
Dielectric Constant |
3.7~3.9 |
|
Dielectric Absorption Coefficient |
＜4*10-4 |
|
Dielectric Loss Coefficient |
＜1*10-4 |
|
Mechanical Properties |
Values |
|
Compressive Strength |
1100MPa |
|
Bending Strength |
67MPa |
|
Tensile Strength |
48MPa |
|
Poisson's Ratio |
0.14~0.17 |
|
Young's Modulus |
72000MPa |
|
Shear Modulus |
31000MPa |
FAQ
Q: What is the maximum temperature the quartz sealed bottom tube can withstand?
A: It can withstand continuous operation at 1100°C and short - term exposure up to 1450°C.
Q: Is the tube resistant to acids and alkalis?
A: Yes, it is highly resistant to most acids and alkalis, but it should not be used with hydrofluoric acid, as quartz reacts with HF.
Q: Can the sealed bottom tube be autoclaved?
A: Yes, it is compatible with autoclaving for sterilization purposes.
Q: Can the sealed bottom tube be customized in terms of size and shape?
A: Yes, we offer customization services for diameters, lengths, and special designs to meet specific application needs.
Q: What is the lead time for orders?
A: It depends on order quantity.
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