From food production to semiconductor manufacturing, even microscopic contaminants can disrupt processes, damage equipment, or compromise end products.

Dryers, filters, oil/water separators, aftercoolers, and drains all work together to protect compressed air system — as well as downstream equipment and final products — from harmful contaminants such as moisture, oil, and solid particles.

Effective air treatment ensures higher system reliability, extended maintenance intervals, and consistent product quality. In many industries, it’s not just recommended — it’s a mandatory requirement to meet specific compressed air quality standards.

To prevent risks and ensure consistency, the ISO 8573 standard was developed — a globally recognized standard defining compressed air quality and cleanliness.

As the operator of a compressed air system, it’s essential to understand which type of air treatment and equipment process requires to comply with the applicable air purity standards and maintain optimal system performance.

What Is ISO 8573-1?

ISO 8573-1 (2010 edition) is an internationally recognized standard for compressed air quality. It serves as a clear guideline for determining how clean compressed air must be. This standard defines seven purity classes and categorizes three main types of contaminants:

• solid particles (dust, rust or debris)
• water (liquid, vapor or aerosol)
• oil (liquid, aerosol and vapor form)

Each contaminant is assigned a class number, with Class 1 representing the highest purity. For example, compressed air used in pharmaceutical or semiconductor production typically requires Class 1 or Class 2, while general industrial applications may operate with lower classes.

The standard forms the foundation for designing, selecting, and maintaining filtration and drying systems — ensuring that air delivered to the point of use meets the exact requirements of the process it serves.

How is air quality measured?

To verify compliance with ISO 8573-1, accurate measurement is essential.

OMEGA AIR provides a complete range of measuring equipment designed for continuous or periodic air quality analysis — enabling users to monitor, document, and optimize their systems.

Among our key solutions are:

• Laser particle counters – precisely detect and classify particles down to 0.1 µm, ensuring full traceability of solid contamination.
• Oil vapor monitors – identify hydrocarbon contamination in real time.
• Dew point meters – continuously track moisture levels to protect against condensation and corrosion.

Find out more about our offer of system monitoring equipment.

Our instruments help operators maintain ISO-compliant air quality while minimizing downtime, protecting sensitive equipment, and supporting energy-efficient operation.

Filtration that meets ISO 8573-1 standards

As a manufacturer of alternative filter elements designed in accordance with ISO 8573-1, OMEGA AIR delivers performance and reliability proven through independent testing. All filter elements are tested by IUTA (Institut für Umwelttechnik, Germany) — one of the most recognized and accredited laboratories for compressed air and gas filtration testing. Our filters are engineered to match or exceed the performance of original manufacturers’ equipment while ensuring compliance with the required ISO purity class. Whether you operate in food processing, medical technology, electronics, or industrial manufacturing, you can rely on OMEGA AIR filtration solutions to deliver clean, dry, and oil-free air every time.

Why ISO 8573-1 compliance matters

Compliance with ISO 8573-1 is not just about meeting regulatory expectations — it’s about ensuring:

• Product quality and safety — contamination-free processes mean consistent output and fewer defects.
• Equipment longevity — clean air reduces wear on valves, actuators, and instruments.
• Energy efficiency — properly maintained air systems use less energy and operate more effectively.
• Operational reliability — real-time monitoring allows early detection of issues before they affect production.

By combining accurate measurement and certified filtration, companies can secure both operational and environmental performance while meeting the strictest industrial standards.

Conclusion

ISO 8573-1 defines what clean compressed air truly means — but achieving it requires both the right equipment and reliable monitoring.

At OMEGA AIR, we provide both:

• Filter elements and filter housings tested by IUTA and manufactured to the highest standards.
• Measurement systems that give you real-time insight into air purity.

Together, they form a complete solution for industries where precision, safety, and sustainability are non-negotiable. 

 Compressed air applications and the classification: