Quartz rectangular tubes (also known as square quartz tubing or fused silica rectangular tube) are high-purity SiO₂ glass components engineered for demanding industrial and scientific applications. They deliver exceptional thermal stability, broad-spectrum optical transparency, and superior chemical inertness in high-temperature, corrosive, or UV-intensive environments.
Key Applications
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Laboratory & Analytical Instruments: Serve as reaction chambers, optical cuvettes, and sample cells in spectrometers, chromatography systems, and COD digestion analysis.
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Semiconductor Manufacturing: Function as process chambers, wafer carriers, and diffusion furnace components requiring ultra-high purity and thermal stability.
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UV Sterilization Systems: Provide optimal 254nm germicidal UV transmission in water treatment, air purification, and medical disinfection equipment.
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Optical Systems & Photonics: Used as optical path spacers, sensor module housings, and laser coupling components with flat surfaces for precise alignment.
Material & Technical Properties
Fused quartz (fused silica) rectangular and square tubing offers a unique combination of physical, thermal, and optical characteristics:
| Property | Value / Description |
|---|---|
| SiO₂ Purity | ≥99.99% |
| Density | 2.2 g/cm³ |
| Continuous Operating Temperature | 1100°C |
| Short-Term Maximum Temperature | Up to 1450°C |
| Softening Point | 1730°C |
| Coefficient of Thermal Expansion | 5.5×10⁻⁷ /°C |
| Visible Light Transmission | ≥93% |
| UV Transmission (254nm) | ≥85% |
| Refractive Index | 1.45845 |
| Mohs Hardness | 5.5–7.0 |
| Resistivity | 7×10⁷ Ω·cm |
| Chemical Resistance | Inert to most acids (except hydrofluoric acid) |
Fused silica rectangular tubing resists rapid temperature fluctuations without cracking and maintains stable electrical insulation even under extreme heat.
Technical Specifications & Standard Dimensions
All quartz square and Quartz rectangular tubes can be manufactured in both standard stock sizes and custom configurations to meet specific application requirements.
Typical Square / Quartz Rectangular Tube Dimensions (OD × ID, mm):
| Shape | Outer Dimensions | Inner Dimensions | Wall Thickness | Standard Lengths |
|---|---|---|---|---|
| Square Capillary | 1.0 × 1.0 | 0.6 × 0.6 | 0.2 | 100–1000 |
| Square Capillary | 3.0 × 3.0 | 2.0 × 2.0 | 0.5 | 100–1000 |
| Square Capillary | 4.0 × 4.0 | 1.0 × 1.0 | 1.5 | 100–1000 |
| Square Capillary | 5.0 × 5.0 | 2.0 × 2.0 | 1.5 | 100–1000 |
| Square Tube | 7.0 × 7.0 | 5.0 × 5.0 | 1.0 | 100–2000 |
| Square Tube | 8.0 × 8.0 | 5.0 × 5.0 | 1.5 | 100–2000 |
| Square Tube | 9.0 × 9.0 | 6.0 × 6.0 | 1.5 | 100–2000 |
| Square Tube | 10.0 × 10.0 | 7.0 × 7.0 | 1.5 | 100–2000 |
| Quartz Rectangular Tube | 13.0 × 10.0 | Custom | Custom | 100–2000 |
| Quartz Rectangular Tube | 4.0 × 3.0 | 2.0 × 1.0 | 0.5 | 100–1000 |
General Capability Range:
| Parameter | Range | Typical Tolerance |
|---|---|---|
| Outer Width/Height | 0.3 mm – 400 mm | ±0.05 mm to ±0.1 mm |
| Inner Width/Height | 0.1 mm – Custom | ±0.03 mm |
| Wall Thickness | 0.2 mm – 10 mm | ±10% for ≤10 mm |
| Length | 1 mm – 5000 mm | ±0.2 mm |
Custom rectangular quartz tubing is available in virtually any dimension, including multi-hole, eccentric, and shaped configurations. Hydroxyl (OH) content can be controlled to <2 ppm for enhanced UV transparency.
Product Advantages
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High Purity: SiO₂ content ≥99.99% ensures minimal contamination in sensitive applications.
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Exceptional Thermal Shock Resistance: Withstands rapid heating and cooling cycles from 1100°C to room temperature without cracking.
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Broad Optical Transmission: >93% visible light transmission and >85% UV-C transmission, ideal for UV sterilization and optical sensing.
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Superior Chemical Inertness: Resistant to virtually all acids (excluding hydrofluoric acid), making it suitable for corrosive environments.
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Precision Flat Surfaces: Square and rectangular geometry provides flat optical faces for accurate light path alignment and simplified instrument integration.
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Customizable to Exact Specifications: Any dimensions, tolerances, hole configurations, and surface finishes available upon request.
Quality Assurance & Compliance
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Manufactured from high-purity fused silica with SiO₂ ≥99.99%.
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Dimensional tolerances as tight as ±0.03 mm for capillary-grade products.
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Standard products comply with relevant industrial and laboratory material purity requirements.
