What is quartz glass?

Quartz glass is a type of transparent glass made from pure silicon dioxide (SiO2). It possesses numerous unique properties and finds a wide range of applications. In this text, we will provide a detailed introduction to quartz glass, covering its definition and properties, manufacturing and processing, application areas, types and forms, as well as its advantages and limitations.

Definition and Properties:

Quartz glass is a transparent glass material primarily composed of silicon dioxide (SiO2). It exhibits excellent physical, chemical, and structural properties. It has high transparency and can transmit a wide spectrum of light, from ultraviolet to infrared. Additionally, quartz glass possesses high thermal conductivity, a low coefficient of thermal expansion, excellent electrical insulating properties, and remarkable chemical stability. These properties make quartz glass highly valuable in various fields.

Manufacturing and Processing:

The manufacturing process of quartz glass includes several key steps: raw material selection, melting, forming, and heat treatment.

Raw Material Selection: High-purity silicon stone is chosen as the primary raw material because silicon dioxide (SiO2) is the main component of quartz glass.

Melting: Selected silicon stone is melted at high temperatures and then refined to remove impurities.

Forming: Molten silicon dioxide forms transparent quartz glass blanks during the cooling process.

Heat Treatment: To relieve internal stresses in the blanks, processes such as annealing and quenching are carried out.

Furthermore, quartz glass can be processed into various shapes and sizes through techniques like cutting, grinding, and polishing.

Application Areas:

Due to its exceptional properties, quartz glass is widely used in various fields. The main application areas include:

Electronics: Quartz glass is used in the electronics industry for manufacturing integrated circuit chip packages, high-performance optical devices, and high-temperature furnace tubes, among other components.

Construction: It serves as transparent building materials in construction, such as glass curtain walls and insulated glass. It is also used for making skylights, lighting fixtures, and more.

Automotive: Quartz glass is employed in the automotive industry for manufacturing headlights, windows, dashboards, and other parts to enhance driving safety.

Mechanical Engineering: It is often used as components in laboratory equipment and precision instruments, including optical instruments and lasers.

Aerospace: Quartz glass finds extensive applications in aerospace for items like space telescopes and satellite components due to its excellent physical and chemical properties suitable for extreme environments.

Types and Forms:

Quartz glass can be categorized into two main types based on manufacturing processes: fused quartz glass and synthetic quartz glass. In terms of appearance, it can be divided into transparent block quartz glass and processed quartz glass products. Transparent block quartz glass is used to make flat glass and vessels, while processed quartz glass products are specific shapes and sizes achieved through cutting, grinding, polishing, etc., such as optical fibers, crucibles, and furnace tubes.

Advantages and Limitations:

Quartz glass offers many advantages like high transparency, high purity, high thermal conductivity, low thermal expansion coefficient, and more. However, there are also some limitations and challenges. The complex manufacturing process, the need for high-purity raw materials, and strict processing requirements result in higher manufacturing costs. Despite its excellent chemical stability, quartz glass can still undergo chemical reactions at high temperatures, affecting its performance and lifespan. Due to its relatively high hardness and brittleness, special care is required during processing and transportation to prevent cracking or breakage. Additionally, the higher cost of quartz glass restricts its use in some applications.

How is quartz glass different from normal glass?

Glass is ubiquitous in our daily lives, from windows to eyeglasses, to various containers and building materials. However, not all glass is the same. This text provides a detailed comparison between quartz glass and common glass.


Quartz glass and common glass differ significantly in composition. Quartz glass is primarily composed of pure silicon dioxide (SiO2), typically with a purity of 99.995% or higher, making it extremely pure with minimal impurities. In contrast, common glass consists of silicon dioxide (SiO2), calcium (Ca), sodium (Na), silicon (Si), and other trace elements.


Quartz glass has very high purity, with almost no impurities, resulting in excellent light transmission and full light reflection capabilities. Common glass, due to its lower purity and the presence of various impurities, has reduced optical performance.

Heat Resistance:

Quartz glass demonstrates outstanding heat resistance, with the ability to withstand extremely high temperatures, up to 1200°C. This means it remains stable in high-temperature environments without thermal cracking or deformation. In contrast, common glass may experience thermal cracking or deformation at high temperatures.


Thanks to its high purity, quartz glass has 100% light transmittance, meaning it can transmit light across all wavelengths. Common glass has lower transparency due to internal impurities and structural factors affecting light transmission.

Chemical Resistance:

Quartz glass has high resistance to chemical corrosion and is virtually unaffected by most chemicals. Consequently, it is extensively used in chemical laboratories and industrial production. Common glass is more susceptible to chemical attack.

Strength and Hardness:

Quartz glass boasts high strength and hardness, second only to diamond. This translates to good wear resistance and impact resistance. Common glass is comparatively weaker.

Production Process:

The manufacturing process for quartz glass is relatively complex, involving high-temperature melting and cooling. Due to its high purity, strict quality control is necessary during production. Common glass has a simpler manufacturing process.

In summary, quartz glass and common glass differ significantly in terms of composition, purity, heat resistance, transparency, chemical resistance, strength, hardness, and production processes. Depending on the specific application, different types of glass can be chosen to meet various requirements.