Skip to main content
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

Compressed Air 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

We use optional analytics providers, including GA4, PostHog, and Microsoft Clarity, to understand platform usage and improve our services. We do not sell personal information. See our Cookie Policy and Privacy Policy.