📰 ANNAIR INSIGHTS | June 2025 Edition
Subject: Demystifying ISO 8573.1 – Understanding Compressed Air Quality Standards
💡 Why Compressed Air Quality Standards Matter
Compressed air isn’t just air—it’s a critical utility in industries ranging from manufacturing to pharmaceuticals. However, without proper treatment, compressed air carries moisture, oil, and solid particles that can cause serious damage to equipment and contaminate products.
To ensure safety, efficiency, and product quality, the international standard ISO 8573.1 provides a structured classification for compressed air purity.
📘 What is ISO 8573.1?
ISO 8573.1 defines the quality classes for compressed air based on three key contaminants:
- Solid Particles
- Water (Humidity / Dew Point)
- Oil (Aerosol + Vapor)
Class X:Y:Z
Where:
X = Particle Class
Y = Dew Point Class
Z = Oil Class
🔍 A Breakdown of Each Class
1️⃣ Solid Particles
| Class | Max Particle Size | Max Count/m³ |
|---|---|---|
| 1 | ≤ 0.1 µm | ≤ 20 |
| 2 | ≤ 1.0 µm | ≤ 400 |
| 3 | ≤ 5.0 µm | ≤ 10,000 |
| 4 | ≤ 15.0 µm | ≤ 100,000 |
| 5 | ≤ 40.0 µm | ≤ 1,000,000 |
2️⃣ Water (Dew Point)
| Class | Pressure Dew Point (PDP) |
|---|---|
| 1 | ≤ -70°C |
| 2 | ≤ -40°C |
| 3 | ≤ -20°C |
| 4 | ≤ +3°C |
| 5 | ≤ +7°C |
| 6 | ≤ +10°C |
3️⃣ Oil Content
| Class | Max Oil (Aerosol + Vapor) |
|---|---|
| 1 | ≤ 0.01 mg/m³ |
| 2 | ≤ 0.1 mg/m³ |
| 3 | ≤ 1.0 mg/m³ |
| 4 | ≤ 5.0 mg/m³ |
🛠️ Common ISO Classes by Application
| Application | Suggested Class |
|---|---|
| Pneumatic tools (general use) | 4:4:4 or 5:4:3 |
| Instrumentation air | 3:4:1 or 2:3:1 |
| Food, beverage (dry packaging) | 1:2:1 or 2:2:2 |
| Paint spraying (automotive) | 1:2:1 |
| Breathing air/medical | 1:2:1 or better |
⚙️ Achieving the Right Air Quality
To comply with ISO standards, a typical system includes:
- ✅ Pre-Filters & Coalescing Filters – Remove particles and oil aerosols
- ✅ Activated Carbon Filters – Remove oil vapors and odors
- ✅ Air Dryers (Refrigerated / Desiccant)—Remove moisture to required dew point
- ✅ Auto Drains & Moisture Separators – Prevent condensate buildup
- ✅ Monitoring Devices – Track dew point, oil, and particle levels
📌 Final Thought
Using compressed air without quality control is like running an engine without oil—it leads to breakdowns, downtime, and unexpected costs.
At ANNAIR Drychill Tech India Pvt Ltd, we design and supply complete air treatment systems that help you meet the right ISO 8573.1 class for your process needs.
Let’s ensure your compressed air is as clean as your product demands.
📞 +91-8080616660 | 🌐 www.annair.com
✉️ sales@annair.co.in
