Quartz glass is a man-made glass material made of high-purity silicon dioxide, with excellent performance, widely used in various high-tech fields. The purity of quartz glass has a critical impact on its performance, so identifying the purity of quartz glass is the key to ensuring its quality and application effectiveness.

The basic concept of quartz glass purity

The purity of quartz glass refers to its silica content, usually expressed as a percentage. The silica purity of ordinary glass is about 70%, while the purity of quartz glass can reach 99.99% or even higher. High purity quartz glass has excellent physical and chemical properties, such as good transmission properties in the ultraviolet and infrared regions, excellent thermal stability, resistance to strong acids, and low coefficient of thermal expansion.

Quartz Glass Purity Identification Methods

Density Test

The density of quartz glass is generally between 2.2-2.5 g/cm³, which is higher than that of ordinary glass. By measuring the density of quartz glass, you can initially determine its purity. The closer the density is to the theoretical value, the higher the purity.

Hardness Test

Quartz glass is very hard, usually between 7.5-8.0. A Mohs hardness tester can be used to perform a scratch test to determine its hardness. The higher the hardness, the higher the purity usually is.

Ultraviolet Light Test

Place the quartz glass under UV light, if it shows a light blue color or colorless, it indicates a higher purity. However, this method requires the use of specialized UV lamps and has a relatively narrow scope of application.

Chemical analysis

Through chemical analysis, the content of various impurity elements in quartz glass can be accurately determined. Commonly used methods include atomic absorption spectrometry, inductively coupled plasma mass spectrometry and so on. These methods can accurately determine the content of alkali metals (Li, Na, K), transition metal elements (Fe, Cr, Mn, Ni, Cu), and metal elements such as Al, B, and Ti in quartz glass, so as to judge its purity.

Observation of Appearance

High purity quartz glass is usually highly transparent and free of bubbles, inclusions and other impurities. By observing its appearance, you can initially judge its purity. However, it should be noted that materials with similar appearance (e.g. soda-lime glass, borosilicate glass, etc.) may be misjudged, so it is necessary to combine with other testing methods to make a comprehensive judgment.

Thermal Stability Test

High purity quartz glass has excellent thermal stability. You can judge its purity by heating test and observing whether there are deformation, cracking and other phenomena.

Factors affecting the purity of quartz glass

Raw material

The purity of raw materials is the key factor affecting the purity of quartz glass. If the purity of raw materials is not enough, the quartz glass produced will also have various problems, such as air bubbles, impurities, high hydroxyl content, severe crystal precipitation, etc.

Production process

The production process also has an important impact on the purity of quartz glass. If the process control is not strict, such as uneven distribution of temperature field, exhaust insufficient, etc., will lead to defects in the quartz glass and the nature of the change.

Measures to improve the purity of quartz glass

Selection of high-purity raw materials

Selection of high-purity silica as raw materials is the key to improving the purity of quartz glass.

Optimize the production process

By optimizing the production process, such as strictly controlling the distribution of temperature field, strengthening the exhaust, etc., the production of defects in quartz glass can be reduced and its purity can be improved.

Strengthen quality control

Strengthening quality control in the production process, such as regular chemical analysis, appearance inspection, etc., can be timely found and deal with unqualified products to ensure the purity of quartz glass.

The purity of quartz glass has a crucial impact on its performance and application effect. The purity of quartz glass can be comprehensively judged through density test, hardness test, ultraviolet light test, chemical analysis, observation of appearance and thermal stability test. At the same time, the use of high-purity raw materials, optimize the production process and strengthen the quality control measures can also effectively improve the purity of quartz glass.

Luverre Quartz manufactures and sells a wide range of high quality quartz glass, including quartz tubes, quartz plates, quartz rods, quartz windows, quartz crucibles, quartz boats, quartz flanges, quartz beakers, quartz glass instruments, and more. We can meet all kinds of customized requirements for quartz glass products.