2026-04-13Views：
The oil content of compressed air grade is different according to different standards and application fields. The following are the oil content levels of compressed air according to ISO 8573 and other application-specific standards:
ISO 8573 standard:
Class 1: Oil content less than 0.01 mg/m & sup3;, filtration efficiency> 99.9999%.
Class 2: Oil content less than 0.1 mg/m & sup3;, filtration efficiency> 99.999%.
Class 3: Oil content less than 1 mg/m & sup3;, filtration efficiency> 99.99%.
Class 4: Oil content less than 5 mg/m & sup3;, filtration efficiency> 99.9%.
Class 5: Oil content less than 25 mg/m & sup3;, filtration efficiency> 99%.
Class 6: Oil content less than 100 mg/m & sup3;, filtration efficiency> 98%.
Class 0: This is a special high grade that 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.
Application-specific criteria:
chinese Pharmacopoeia and GMP standard: the oil content of compressed air is less than or equal to 0.1 mg/m & sup3;, which is drawn from the provisions of the European Pharmacopoeia.
Compressed air for diving breathing standards: Oil content <5 mg/m & sup3;(equivalent to ISO 8573 class 4) is required in the USA and China, and <1 mg/m & sup3;(equivalent to ISO 8573 class 2) in the UK.
Please note that the oil content levels in these standards are based on different application needs and conditions. In order to ensure that the oil content of the compressed air meets the standard, some air compressor manufacturers will be equipped with high-efficiency oil and gas separators and air filters to further reduce the oil content in the compressed air. At the same time, regular maintenance and inspection is also an important measure to ensure the quality of compressed air.
To sum up, the oil content of compressed air grades is set according to different standards and specific application requirements, among which the ISO 8573 standard provides a widely accepted classification system, while the specific application standards are more specific according to the actual application scenarios.
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