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What is quartz glass?

Quartz glass is a special industrial technical glass made by melting various pure natural quartz materials (such as crystal and quartz sand). It is composed solely of silicon dioxide. This type of glass has a hardness that can reach up to Mohs’ seven, and it exhibits excellent properties including high-temperature resistance, a low coefficient of thermal expansion, resistance to thermal shock, chemical stability, and electrical insulation. Moreover, it can transmit both ultraviolet and infrared light. With the exception of hydrofluoric acid and hot phosphoric acid, it demonstrates good resistance to most common acids. Based on transparency, quartz glass is categorized into two main types: transparent and opaque. According to purity, it is further divided into three grades: high-purity, standard, and doped. It is produced from raw materials such as crystal, silica, and silicates through high-temperature melting or chemical vapor deposition. Melting methods include electric melting and gas refining. Quartz glass has an extremely low linear thermal expansion coefficient—only about one-tenth to one-twentieth of that of ordinary glass—giving it outstanding resistance to thermal shock. It boasts exceptional heat resistance, with typical operating temperatures ranging from 1100°C to 1200°C, and can withstand short-term exposure up to 1400°C.

Quartz glass is primarily used in laboratory equipment and in refining devices for special high-purity products. Due to its high spectral transmittance and its resistance to damage from radiation—while other glasses darken when exposed to radiation—quartz glass is also an ideal material for spacecraft, wind-tunnel windows, and the optical systems of spectrophotometers.

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Champion Optics is a high-tech enterprise integrating the research and development of optical thin films, the development of new spectral instruments, and spectral image processing and application.

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