2026-04-15Views：
In the compressed air system, the dust content after 5-stage filtration is a key quality indicator, which directly affects the applicability of compressed air in industrial production. The following are professional solutions based on international standards and industry practice:
according to the ISO 8573.1 international standard, the quality level of compressed air is passed. Dust content, oil content and pressure dew point(dry and wet degree) three indicators to divide. among them, dust content level the correspondence with the filter level is as follows:
| Grade | maximum dust content | corresponding particle size |
|---|---|---|
| level 1 | 0.1 mg/m³ | ≤0.1 μm |
| level 2 | 1.0 mg/m³ | ≤1.0 μm |
| level 3 | 5.0 mg/m³ | ≤5.0 μm |
| level 4 | 40.0 mg/m³ | ≤40.0 μm |
| level 5 | ≤40.0 mg/m³ | ≤40.0 μm |
attention: Some documents may associate "level 5" with oil content (e. g. oil content <25 mg/m & sup3;), but according to ISO 8573.1, the level 5 standard for dust content is clearly ≤40.0 mg/m³(particle size ≤ 40.0 μm).
the requirements for dust content of compressed air vary significantly in different industries:
| Industry | dust content requirements | corresponding ISO level |
|---|---|---|
| general industry | ≤10 mg/m³ | level 3 or 4 |
| textile/chemical fiber | ≤ 1 mg/m & sup3;(particle size ≤ 3-5 μm) | level 1 or 2 |
| medicine/Electronics | <0.1 mg/m & sup3;(to be sterile) | level 1 (additional sterilization required) |
| spraying/painting | ≤5 mg/m³ | level 2 or Level 3 |
example: A textile factory uses a 5-stage filtration system, and the measured dust content is 38 mg/m & sup3;(particle size ≤ 40μm), which meets the 5-level standard of ISO 8573.1, but cannot meet the strict requirements of textile industry for 1 mg/m & sup3; The filtration system needs to be upgraded.
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