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CHARTCURRENT · v1.0.0DIAG-ISO8573-PURITY

ISO 8573-1 Compressed Air Purity Classes

Provides a visual reference for ISO 8573-1 purity class selection in compressed air system design. Engineers select the appropriate class for each application based on sensitivity to solid particles, moisture, and oil — then specify the treatment train components required to achieve that class at the point of use.

ISO 8573-1 Compressed Air Purity ClassesThree-panel reference chart for ISO 8573-1:2010. Top panel shows solid particle purity classes 0–5 by particle count per cubic metre at ≥0.1 µm, ≥0.5 µm, ≥1 µm, and ≥5 µm. Middle panel shows water content as maximum pressure dew point from Class 1 (−70 °C) to Class 6 (+10 °C). Bottom panel shows total oil content from Class 1 (0.01 mg/m³) to Class 4 (5 mg/m³). Lower class number means tighter / cleaner air.ISO 8573-1:2010 — COMPRESSED AIR PURITY CLASSES← TIGHTER (more stringent)SOLID PARTICLES — MAX COUNT PER m³ AT STATED SIZE RANGECLASS≥0.1 µm≥0.5 µm≥1 µm≥5 µmISO CODE0per specper specper specper specISO 8573-1 Class 0120 000400100ISO 8573-1 Class 12400 0006 0001002ISO 8573-1 Class 23—90 0001 00010ISO 8573-1 Class 34——10 000500ISO 8573-1 Class 45——100 0001 000ISO 8573-1 Class 56–9…(see ISO 8573-1:2010 Table 1 for complete values)WATER CONTENT — MAXIMUM PRESSURE DEW POINT [°C]1−70 °C2−40 °C3−20 °C4+3 °C5+7 °C6+10 °C100 → driest Class 1 (−70 °C) ·····················dryness →····················· wettest Class 6 (+10 °C)TOTAL OIL CONTENT — MAXIMUM [mg/m³]10.01 mg/m³20.1 mg/m³31 mg/m³45 mg/m³Xper spec mg/m³ISO 8573-1:2010
Three-panel reference chart for ISO 8573-1:2010. Top panel — solid particles: table showing Classes 0–5 with maximum particle count per cubic metre at size ranges ≥0.1 µm, ≥0.5 µm, ≥1 µm, and ≥5 µm; Class 0 requires user specification, Class 1 is most stringent. Middle panel — water content: horizontal bars showing maximum pressure dew point from Class 1 (−70°C, driest) to Class 6 (+10°C, least dry). Bottom panel — oil content: bar chart showing Classes 1–4 maximum total oil content from 0.01 mg/m³ to 5 mg/m³.

GOVERNING STANDARDS

ISO 8573 1
ISO 8573 2

ELIMFILTERS TECHNOLOGIES

DRYCORE™

APPLICABLE SYSTEMS

Air Intake Protection

REVISION METADATA

Versionv1.0.0
Statuscurrent
Last Reviewed2026-07-08
Next Review2027-07-08

RELATED ENGINEERING ARTICLES

→Compressed Air Purity
→Compressed Air Quality Verification
→Compressed Air Dryer Selection
→Testing And Validation