2026-04-15Views：
The air produced by the oil-free air compressor is not absolutely oil-free, but its oil content is extremely low and can be controlled within the range permitted by industry standards through technical means. The following is a detailed analysis:
no lubricating oil added
the oil-free air compressor does not use lubricating oil in the compression process, which avoids the oil pollution caused by the mixing of lubricating oil in the traditional air compressor.
Oil pollution of ambient air
the ambient air itself contains oil vapors (0.05-0.5ppm), and the compression process concentrates these pollutants. Even if the oil-free air compressor does not add lubricating oil, the oil content in the compressed air may still increase due to the ambient air.
ISO 8573-1
the standard divides the oil content in compressed air into 5 levels, of which Class 0 for the highest grade, the required oil content <0.01 mg/m3 (about 0.003ppm) it can be considered "oil-free".
Class 0 Certification Requirements
strict testing is required, including:
theoretical limit
through post-treatment equipment (e. g. coalescing filter, activated carbon adsorption), the oil content of the air of the oil-free air compressor can be as low 0.003ppm, which meets the Class 0 standard.
Fluctuations in practical applications
oil-free air compressor without post-treatment
the exhaust gas oil content may be close to the compressed ambient air level (e. g. 0.05-0.5ppm), but much lower than the oil compressor (30-220ppm).
After efficient filtration
through multi-stage filtration (such as coalescing filter activated carbon), the oil content can be reduced <0.01 mg/m3, in line with the Class 0 standard.
Select Class 0 authentication device
it is preferred to purchase an oil-free air compressor certified to ISO 8573-1 Class 0.
Configure post-processing equipment
Regular maintenance and monitoring
| Key Points | description |
|---|---|
| oil-free & ne; absolutely oil-free | oil-free air compressors avoid lubricating oil pollution, but oil vapor in the ambient air may still cause trace oil pollution. |
| Industry Standard | Class 0 certification requires oil content <0.01 mg/m3, subject to strict testing. |
| Actual oil content | after high-efficiency filtration, it can reach 0.003ppm, but it is affected by the environment, equipment status and maintenance level. |
| Solution | select certified equipment for post-treatment and regular maintenance to ensure air quality. |
If the oil content needs to be further reduced, the post-processing configuration can be optimized according to the specific scene or the monitoring frequency can be increased.
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