2026-04-13Views：
The oil content standard of industrial compressed air varies according to the application field and industry. The following are the oil content standards of industrial compressed air according to different standards and specific applications:
international Standard ISO 8573:
grade 1: Oil content less than 0.01 mg/m & sup3;, filtration efficiency> 99.9999%.
Grade 2: Oil content less than 0.1 mg/m & sup3;, filtration efficiency> 99.999%.
Grade 3: Oil content less than 1 mg/m & sup3;, filtration efficiency> 99.99%.
Grade 4: Oil content less than 5 mg/m & sup3;, filtration efficiency> 99.9%.
Grade 5: oil content less than 25 mg/m & sup3;, filtration efficiency> 99%.
Grade 6: oil content less than 100 mg/m & sup3;, filtration efficiency> 98%.
In addition, there is Class 0, which requires an oil content of less than 0.01 mg/m & sup3;, which is usually regarded as equivalent to the oil content grade of oil-free compressed air.
china national standards:
for ordinary air compressors, the national standard stipulates that the liquid oil content in the compressed air shall not exceed 5 mg/m & sup3;, and the oil vapor content in the compressed air shall not exceed 0.5 mg/m & sup3;.
Application-specific criteria:
chinese Pharmacopoeia and GMP standard: the oil content of compressed air is required to be less than or equal to 0.1 mg/m & sup3;. This standard is drawn from the provisions of the European Pharmacopoeia, which stipulates that the oil content of medical compressed air must be less than or equal to 0.1 mg/m & sup3;.
Diving breathing compressed air standards: oil content <5 mg/m & sup3; in the United States and China, and <1 mg/m & sup3; in the United Kingdom;.
Air compressor type:
the oil content in the outlet air of the micro-oil air compressor shall not be higher than 0.01 mg/m & sup3;.
For oil-free air compressors, it is generally believed that the oil content is 0.01ppm.
The oil content of the screw air compressor is generally about 3ppm, but the oil content of the high-quality oil-free air compressor can be less than 5ppm.
In summary, the oil content standard for industrial compressed air is a diversified system that takes into account the needs of different industries and specific applications. When selecting and using an air compressor, you should refer to relevant national standards and industry standards to ensure the quality of compressed air and the normal operation of the air compressor. At the same time, regular maintenance and inspection is also an important measure to ensure the stable performance of the air compressor and the oil content standard.
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