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)
Air
quality is expressed in this format:
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.
📩 Contact us for a site visit or
consultation!
📞 +91-8080616660 | 🌐 www.annair.com
✉️ sales@annair.co.in
