At PQP (Pure Quartz Products), we specialize in manufacturing high-purity quartz tubes engineered for the most challenging industrial environments. Their exceptional thermal shock resistance, optical clarity, and chemical inertness make them the material of choice for industries where precision and reliability are paramount. This page details the science, manufacturing processes, and technical specifications that define our products.
The Science Behind Fused Quartz: Unmatched Purity and Performance
Fused quartz is a high-purity glass composed of nearly pure silica (SiO2). Its unique properties stem from a robust, three-dimensional atomic structure of silicon-oxygen tetrahedra.
- Material Types: We offer two primary grades to meet diverse application needs:
- Fused Quartz: Synthesized from natural quartz crystal, offering excellent thermal properties and purity levels up to 99.99%. Ideal for furnace tubes and general high-temperature applications.
- Synthetic Fused Silica: Produced from high-purity chemical precursors. This process yields superior purity (>99.995%), minimal bubble content, and outstanding optical transmission, making it essential for semiconductor and optical fiber manufacturing.
- Key Intrinsic Properties: The defining characteristic of our quartz is its extremely low coefficient of thermal expansion (CTE) of approximately 5.5×10−7m/m/°C. This is about 1/20th that of ordinary glass, granting it remarkable resistance to thermal shock.
Advanced Manufacturing: From CVD Synthesis to Precision Forming
Our state-of-the-art manufacturing processes ensure that every quartz tube meets the highest standards of quality and consistency.
- CVD Synthesis Technology: For applications demanding the highest purity, we employ Chemical Vapor Deposition (CVD). The reaction, SiCl4(g)+O2(g)→SiO2(s)+2Cl2(g), deposits an ultra-pure layer of silica with exceptional uniformity. Our CVD process achieves a bubble rate of less than 0.01% and an impurity content below 10 ppm, setting the industry benchmark.
- Precision Tube Drawing and Forming: We utilize a continuous-drawing process with automated diameter control. This method allows for precise control of both inner (ID) and outer (OD) diameters with a tolerance accuracy of ±0.1%, ensuring perfect fit and performance in your equipment.
Key Technical Specifications: Performance Data You Can Trust
| Property | Specification | Impact on Application |
| Optical Transmission | >90% in the UV region (200-400nm), >92% in the visible light spectrum (400-760nm). Refractive index of ~1.458. | Crucial for applications requiring optical clarity, such as UV lamps and sight glasses. |
| Thermal Performance | Thermal Conductivity: ~1.4 W/(m·K). Specific Heat: ~670 J/(kg·K). Capable of withstanding continuous use at >1100°C. | Ensures excellent thermal stability and insulation in high-temperature furnaces. |
| Mechanical Strength | Tensile Strength: ~50 MPa. Compressive Strength: >1100 MPa. Young’s Modulus: ~73 GPa. | Provides the structural integrity needed for high-pressure or vacuum environments. |
Critical Applications in Leading Industries
Our quartz tubes are integral components in several of the world’s most advanced technological fields:
- Semiconductor Manufacturing: In processes like etching, oxidation, and deposition, our tubes provide an ultra-clean, stable environment. With an inner diameter tolerance reaching ±0.1mm and a surface roughness (Ra) below 0.5μm, they are certified for the most sensitive wafer processing steps.
- Optical Fiber Communication: Used as preform manufacturing tubes, our products guarantee minimal hydroxyl (OH) content (<1 ppm) and exceptional concentricity (<0.5% ellipticity), ensuring low signal loss in the final fiber.
- Plasma and Chemical Analysis (ICP-MS/OES): In ICP plasma torch tubes, our quartz maintains its integrity at extreme temperatures (6,000-10,000K), providing a chemically inert environment critical for accurate atomic analysis.
Our Commitment to Quality: Precision Analysis and Control
Quality is not just a goal; it’s our process.
- Stress and Birefringence Analysis: We use advanced polariscopes and laser interferometers to measure residual stress. Our annealing processes are meticulously controlled to ensure stress levels remain below 10nm/cm, preventing premature failure.
- Trace Element Analysis: Inductively Coupled Plasma Mass Spectrometry (ICP-MS) is employed for sub-ppb level impurity detection, certifying the purity of our materials for semiconductor and laboratory applications.
Innovating for the Future: The Next Generation of Quartz Technology
We are continuously pushing the boundaries of quartz technology. Our research and development efforts are focused on:
- Advanced Surface Modifications: Developing novel surface treatments to further enhance chemical resistance and reduce particle adhesion.
- Intelligent Manufacturing: Integrating AI and machine learning into our processes to predict and control quality parameters in real-time.
These technological advancements represent the future of quartz manufacturing, combining material science and intelligent systems to provide unparalleled technical support for modern high-tech industries.