What is the national oil-free standard for compressed air?

The main basis for the national oil-free standard for compressed air is ISO 8573-1. According to this standard, the highest grade of oil-free compressed air, Class 0, requires an oil content of less than 0.01 mg/m & sup3;. This is the main indicator to measure whether compressed air is oil-free.

At the same time, different application areas may have different requirements. For example, in the Chinese Pharmacopoeia and GMP, the oil content of compressed air is required to be less than or equal to 0.1 mg/m & sup3;. The oil content of medical compressed air must be ≤ 0.1 mg/m & sup3;, which is also a more specific application standard.

In addition, there are other relevant standards and regulations, such as diving breathing compressed air in the United States and China requires oil content <5mg/m3, the United Kingdom is <1mg/m3 and so on. These standards are based on specific application needs and conditions.

Please note that the above information is for reference only, and the specific standards may vary according to different countries, regions and application areas. In practical application, the relevant standards and regulations should be consulted according to the specific situation.