Oil Free Air Compressors: Best Choice for Pure Air
Oil Free Screw Compressors
CompAir Ultima™
100% oil and silicone-free for clean air critical applications
Ultima™ is CompAir's groundbreaking oil-free PureAir screw compressor with a unique design. It is a brand new compressor range and it utilises a low pressure and high pressure dry screw airend. Each airend is individually driven by a variable speed, permanent magnet synchronous motor, offering exceptional levels of efficiency versus traditional oil-free technology.
CompAir is always improving the best products to be even better and more cutting edge.
Oil-free screw compressors are a type of rotary screw compressor designed to produce 100% oil-free compressed air. Unlike traditional oil-injected compressors, they do not use oil in the compression chamber, eliminating the risk of oil contamination in the air stream — crucial when purity is non-negotiable.
🧼 1. Guaranteed Pure Air
Delivers compressed air entirely free of oil, preventing product contamination in sensitive industries like food and beverage, pharmaceuticals, medical, and electronics manufacturing.
Often certified ISO 8573-1 Class 0, the strictest global standard for oil-free air quality.
💰 2. Lower Operating Costs Over Time
No oil changes, oil filters, or oil disposal — reduces long-term maintenance costs.
Less pressure drop and simpler air treatment means better energy efficiency and fewer service interruptions.
🛠 3. Reduced Maintenance Needs
Fewer wear-related components and no lubrication circuit simplifies upkeep and reduces downtime.
🌿 4. Environmentally Friendly
Eliminates risks of oil leaks and contaminated waste oil, helping meet environmental compliance.
📍 5. Reliable & Precise
Robust design and precision machining allow continuous, stable operation in demanding environments.
⚙️ How They Work
Oil-free screw compressors use precision-machined intermeshing rotors that compress air without oil lubrication. Instead of oil, timing gears and advanced materials reduce friction and maintain rotor clearances.
Because no oil is injected into the compression chamber, the output doesn’t require extensive downstream oil removal filters — making the whole system cleaner and simpler than lubricated compressors.
📊 Typical Technical Specs (Industrial Class)
(These are representative ranges from commercial manufacturers — exact specs vary by brand/model.)
Parameter Typical Range
Motor Power ~37 kW to 355 kW
Free Air Delivery ~6 to 53 m³/min
Working Pressure ~4 to 10 bar
Cooling Options Air-cooled or Water-cooled
Certification ISO 8573-1 Class 0 oil-free
Examples from CompAir’s oil-free ranges include two-stage and variable-speed models delivering certified oil-free air for critical applications.
🏭 Where Oil-Free Screw Compressors Shine
These compressors are ideal wherever air purity matters — especially in:
Food & Beverage Processing
Pharmaceutical & Healthcare Production
Electronics & Semiconductors
Medical Devices & Laboratories
Chemical Processing
Textile Manufacturing
📌 Considerations
Higher upfront cost compared to oil-injected units — but often lower total cost over the system’s life.
Requires good inlet air filtration because there’s no oil present to cushion internal parts.
