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ISO8573.1 - Compressed Air Standards
 

The following table shows all of the classes within ISO8571. To choose which class meets your requirements, assess what dewpoint you need, the permissible remaining levels of oil and remaining dirt particles.

ISO8573.1 Class 1-4-1 for example would be a refrigeration dryer with a high quality coalescing filter

Quality Class Particle size in microns Pressure Dewpoint

Oil content

Recommend dryer to meet ISO standard

1 0.1 -70°C 0.01 Mg/m³   Desiccant
2 1 -40°C 0.1 Mg/m³ Desiccant or membrane
3 5 -20°C 1 Mg/m³   Desiccant or membrane
4 15 +3°C 5 Mg/m³ Refrigerated or membrane
5 40 +7°C 25 Mg/m³ High Inlet Temp. dryer
6 - +10°C - High Inlet Temp. dryer