2026-04-13Views：
The oil content of compressed air can be divided according to different standards, including international standard ISO8573, European standard DINISO8573 and other application-specific standards. The following are the oil content levels of compressed air according to these standards:
according to ISO8573 standards:
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 a higher oil-free compressed air standard, namely 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.
According to 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;.
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