Quartz glass tube is an amorphous (glassy) tube made from high-purity silicon dioxide (SiO ₂ ≥ 99.9%) melted at high temperature. It is not ordinary glass, but an irreplaceable basic material in the fields of semiconductors, optics, optoelectronics, and high-end laboratories due to its near limit physical and chemical properties.
1. High temperature resistance
The softening point is as high as 1730 ℃, and it can work at 1200 ℃ for a long time and withstand higher temperatures in the short term.
Excellent thermal shock resistance: with an extremely low coefficient of thermal expansion (~5.5 × 10 ⁻⁷/℃), it can withstand severe and rapid temperature changes without breaking.
2. "Absolute" chemical inertness
Except for hydrofluoric acid (HF) and concentrated phosphoric acid, it hardly reacts with any acid, base, or salt.
The extremely high purity ensures that it will not contaminate the substances inside the tube even at high temperatures, making it an ideal container for handling high-purity reagents and semiconductor materials
3. Excellent optical performance
Extremely wide transmittance range: excellent transmittance from deep ultraviolet (~185nm) to near-infrared (~350nm).
The UV transmittance ranks among the top among all transparent materials, especially synthetic quartz glass.
Key Categories.
| type | Characteristics and main uses | |
| According to raw materials and processes | Fused silica tube | Made by melting natural crystals or high-purity silica sand. Containing trace bubbles, with excellent performance and relatively low cost. Used for electric light sources, laboratory vessels, and high-temperature resistant pipe fittings. |
| Synthetic quartz tube | Produced by chemical vapor deposition (CVD) method. Extremely high purity (>99.999%), no bubbles, and optimal UV transmittance. Expensive in price, used for high-end semiconductors, precision optics, and ultraviolet lasers. | |
| By appearance | Transparent quartz tube | Low bubble impurities and high light transmittance, suitable for occasions that require observation or light transmission. |
| Opaque quartz tube | Contains a large number of tiny bubbles, appearing milky white. Mainly used for insulation, heat preservation, high temperature resistance but without the need for light transmission. |
