High Temperature Heat Resistance Fused Quartz Glass Tube

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1.The manufacturing process of quartz tubes

1.1 Quartz tubes are advanced industrial components manufactured from high-purity fused silica (SiO₂), renowned for their exceptional performance in extreme temperature, high-purity, and optical transmission environments. As a critical material in modern high-end manufacturing, scientific research, and precision equipment, the production of quartz tubes follows a rigorous and standardized process to ensure product stability, reliability, and consistency. The entire manufacturing flow consists of raw material selection, high-temperature melting, precision forming, annealing treatment, and fine processing, each step strictly controlled to meet industrial-grade and even semiconductor-grade quality standards.

1.2 The production process begins with raw material purification and preparation. Only high-purity quartz sand with a purity level exceeding99.99% is selected as the base material. Natural quartz sand or synthetic silica is processed through multiple purification steps, including chemicalwashing, high-temperature calcination, and impurity removal, to eliminate metal ions, alkali metals, and other harmful substances. This step is crucialto ensure the final product has ultra-low impurity content and stable physical and chemical properties. After purification, the raw material is dried andscreened to maintain uniform particle size, laying a solid foundation for subsequent melting and forming.

1.3 Next is the high-temperature melting process, which is the core step in quartz tube manufacturing. Purified quartz sand is placed in a high-temperature melting furnace equipped with graphite or tungsten crucibles. Under vacuum or inert gas protection, the temperature is raised toapproximately 2000°C to completely melt the quartz into a transparent, bubble-free molten liquid. Two main melting technologies are widely used:oxyhydrogen flame melting and electric melting. Oxyhydrogen flame melting produces quartz tubes with excellent optical transparency, while electricmelting allows precise control of the hydroxyl (-OH) content, significantly improving the high-temperature resistance and creep resistance of the tubes, making them ideal for semiconductor and photovoltaic applications.

1.4 After melting, the molten silica enters the precision forming stage. Through automated drawing, blowing, or extrusion technology, the high-temperature molten silica is continuously and stably formed into tubular blanks. The entire forming process is controlled by a computer system toaccurately adjust the drawing speed, temperature, and air pressure, ensuring uniform wall thickness, accurate diameter, and smooth inner and outersurfaces.

Once formed, the quartz tubes undergo controlled annealing treatment to slowly cool down from high temperature to room temperature.This process effectively eliminates internal stress caused by rapid temperature changes, preventing cracking, deformation, or breakage duringsubsequent processing and actual use, greatly enhancing the structural stability of the tubes.

1.5 The final step is precision finishing and quality inspection. According to different application requirements, the quartz tubes are cut to fixed lengths, ground, polished, sealed at both ends, flared, or threaded.Advanced processing equipment ensures dimensional accuracy up to the micrometer level, meeting the assembly requirements of precision instruments. Each finished quartz tube undergoes strict quality testing, including visual inspection, dimensional measurement, purity analysis, and high-temperature resistance testing, to ensure it fully meets industry standards before leaving the factory.

2. Advantage of clear quartz tube

2.1 Quartz tubes possess a unique set of performance advantages that make them irreplaceable in many high-end fields. Firstly, they have excellent thermal stability, capable of long-term use at 1100°C and short-term resistance to temperatures up to 1300°C, with an extremely low thermal expansion coefficient, enabling them to withstand rapid cold and hot shock without damage.

2.2 They exhibit superior chemical inertness, resisting corrosion from almost all acids, alkalis, and organic solvents except hydrofluoric acid, far exceeding the corrosion resistance of ordinary glass, ceramics, and metal materials.

2.3 Quartz tubes feature ultra-high purity, with almost no metal ion precipitation, making them ideal for high-purity environments such as semiconductors and laboratories.

2.4 They have excellent optical transmission performance, with high transparency in the ultraviolet, visible, and infrared bands, suitable for optical equipment and lighting systems.

2.5 They provide outstanding electrical insulation, maintaining stable insulation properties even at high temperatures, making them widely used in electronic and electrical equipment.

3.Application of clear quartz tube:

Thanks to these outstanding advantages, quartz tubes are widely used in many key industries. In the semiconductor and photovoltaic industry,they are used as high-purity reaction tubes, diffusion furnaces, oxidation tubes, and wafer carriers. In optoelectronics and lighting, they serve asultraviolet germicidal lamp tubes, laser protective sleeves, and high-intensity lamp shells. In laboratory analysis instruments, they are used as ICP plasma tubes, spectral detection windows, and high-temperature reaction vessels. In chemical and industrial equipment, they act as thermocouple protection tubes, corrosion-resistant pipelines, and high-temperature observation windows.

They also play an important role in aerospace, medical equipment, and new energy fields. With the continuous development of advanced manufacturing technology, the application scope of quartz tubes will continue to expand, becoming an indispensable key material in cutting-edge technology and industrial innovation.

4.Parameter

Technical Data of Clear Quartz Glass Tube

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