Solid Particle Classes
Solid particles in compressed air can damage equipment, contaminate products, and affect processes. ISO 8573-1 defines 8 classes (0-7) based on the quantity and size of allowed particles.
Classification Table
| Class | Particles per m³ | Concentration |
|---|---|---|
| 0.1-0.5 µm | 0.5-1 µm | |
| ------- | ----------- | --------- |
| 0 | Per user specification | |
| 1 | ≤20,000 | ≤400 |
| 2 | ≤400,000 | ≤6,000 |
| 3 | - | ≤90,000 |
| 4 | - | - |
| 5 | - | - |
| 6 | - | - |
| 7 | - | - |
Interpretation
- Class 0: Special requirements defined by the user
- Classes 1-2: Ultra-clean air, typical for electronics and pharmaceutical
- Classes 3-4: Clean air for demanding applications
- Classes 5-7: General quality air
Filtration
To achieve low particle classes, high-efficiency filters (0.01 µm) are required, properly installed and with regular maintenance.