2026-04-13Views：
The oil content of air is usually classified according to the international standard ISO 8573-1, which clearly stipulates the maximum allowable content of oil in compressed air. The following is the classification of air oil content levels according to ISO 8573-1:
CLASS 0 (or oil-free grade): Oil content less than 0.01 mg/m & sup3;. Although it is called "oil-free", it is not absolutely oil-free, but the oil content is extremely low. Compressed air that meets this standard can be regarded as oil-free.
CLASS 1: Oil content not exceeding 0.01 mg/m & sup3;. This level is similar to CLASS 0, but allows the same upper limit of oil content, and is sometimes used interchangeably in applications.
CLASS 2: Oil content not exceeding 0.1 mg/m & sup3;. This level is considered a low oil state and is suitable for some application scenarios where the oil content is less stringent.
CLASS 3: Oil content not exceeding 1 mg/m & sup3;. This level is considered routine and suitable for many industrial applications where a certain oil content is acceptable.
In addition, there are more subdivided grade standards, such as grade 4 to grade 6, which correspond to different oil content and filtration efficiency standards, but these are usually not common classification methods.
It should be noted that different industries and applications may have different requirements for the oil content of compressed air. For example, in the pharmaceutical, food, and semiconductor industries, there may be higher requirements for the purity of compressed air, so a higher level of oil content needs to be selected.
In general, the selection of the appropriate air oil content level depends on the specific application needs and industry standards. When selecting a compressed air system or equipment, the required air quality standards should be identified and the selected equipment can meet these standards.
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