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　　There are many types of gas products, which can be roughly divided into general industrial and special. The production and sales volume of general industrial gases is large, but the purity requirements are not high. Although the production and sales volume of special gases is small, according to different uses, there are strict requirements on the purity or composition of different special gases, the maximum content of harmful impurities allowed, the packaging, storage, and transportation of products, etc., which are high-tech and high value-added products.

　　Generally speaking, special gases can be divided into three categories: ultra-high purity gases, standard calibration gases and mixed gases with specific compositions. Gas products are important basic raw materials for modern industry and have a wide range of applications. Metallurgy, steel, petroleum, chemical industry, machinery, electronics, glass, ceramics, building materials, construction, food processing, medicine and other departments all use a large number of common or special gases.

　　High-purity gas is a term in the gas industry, generally referring to any level of purity that can be achieved using modern purification technology.

　　Due to its wide coverage, the production and supply of gas is generally regarded as the infrastructure of the industrial investment environment, just like electricity and water supply, and is regarded as the "lifeline" of the national economy and listed as a public utility industry.

　　In recent years, with the rapid development of the national economy, product coverage has expanded, usage has increased, new products have continued to be launched, purity has increased, and market demand has expanded. The growth rate of output value has greatly exceeded the growth rate of the national economy in the same period, and the annual growth rate has reached 12%. The total output value of the natural gas industry accounts for a small proportion of the national economic GDP, but it has had an important impact on technological sectors such as microelectronics, aerospace, bioengineering, new materials, precision metallurgy, and environmental science that have developed rapidly in recent years. Natural gas, which is an indispensable raw material for these sectors, is driven by the needs and promotion of various emerging industrial sectors and modern science and technology. Natural gas industry products have achieved significant leaps in development in terms of variety, quality, quantity, etc.

　　In the production of sub-micron integrated circuits, in order to ensure the gas purity of the final gas process equipment, it is required to supply 10-9 high-purity gas to reduce the impurity content in the gas.

　　The amount of gas (including dust particles) is controlled within the specified number, and usually a terminal purification device or a terminal high-precision gas filter is set in front of the equipment.

　　In order to detect the purity and impurity content of high-purity gases, the sending system should be equipped with necessary continuous detection instruments such as water content or oxygen impurity content measurement, and should also be equipped with a regular sampling sample inlet to sample at the specified time and analyze the various impurity contents in the high-purity gases.