To keep the content of the components in the standard gas and mixed gas basically unchanged for a long time, the choice of packaging container material and the processing technology of the inner wall of the packaging container are extremely important.

High-pressure steel cylinders are one of the most commonly used packaging containers for mixed gas and standard calibration gas. Generally speaking, the main reasons for the change of the gas component content in the steel cylinder are as follows: the gas component chemically reacts with the material of the inner wall of the steel cylinder; the gas component is adsorbed by the inner wall of the steel cylinder; water dissolves and absorbs; the inner wall of the steel cylinder adsorbs impurities and desorbs the gas. Because of the above reasons, strict inner wall treatment of the cylinder must be carried out before the cylinder is filled with the standard mixture.

Common treatment methods include: polishing the inner wall of the steel cylinder; electroplating treatment (such as galvanizing, nickel, chromium, copper, gold, etc.) on the inner wall; phosphating treatment; chemical coating treatment, etc.

New methods for the treatment of the inner wall of steel cylinders continue to come out. In order to reduce the reaction and adsorption of gas components with the inner wall of the container, the selection of the material of the steel cylinder is also extremely important. The stability test of standard calibration gas storage in steel cylinders of different materials (such as carbon steel, aluminum alloy and stainless steel, etc.) shows that it is better to store standard gas in aluminum alloy steel cylinders.