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.
Considering that the highest cost in the lifecycle of a compressor is the energy to run it, the unique design of Ultima has allowed us to combine the ultimate performance with the ultimate efficiency, and still deliver a footprint 37% smaller than a conventional two-stage oil-free compressor. This allows easy installation in the smallest possible space – more than a benefit where space is limited – it is a real property cost saving.
Ultima™ - the real deal
Ultima compressors are 100% oil and silicone-free and meet ISO 8573-1 Class Zero (2010), making them the ideal choice for stringent oil-free applications within food and beverage, pharmaceutical, electronic and the automotive industries. What makes this compressor series unique is the lack of a gearbox. Ultima uses ultra high efficiency direct drive motors which replace the gearbox and the single motor, which optimise performance throughout the complete volume range, as the airends can be driven at different speeds dependant on the demand. With a single motor driving both airends together this is not possible. This is where Ultima is hard to beat.
Oil-free screw compressors are a type of rotary-screw air compressor where two helical rotors (male and female) mesh together. As the rotors turn, they trap and compress air between their lobes and the casing. Unlike oil-injected compressors, no oil is sprayed into the compression chamber, so the air stays free of oil droplets.
Key design features include:
Precision-machined timing gears to control rotor movement without oil lubrication.
Advanced seals and tight tolerances to prevent leaks and maintain compression efficiency.
Cooling systems (air or water) to manage heat generated during compression since oil isn’t available to absorb heat.
🧠 Main Advantages
✅ 1. 100 % Oil-Free Air
Guaranteed oil-free air makes these compressors ideal for applications where even trace oil can ruin products, processes, or equipment.
✅ 2. Protects Sensitive Equipment & Product Quality
Oil-free air prevents contamination in:
Food and beverage processing
Pharmaceuticals
Electronics manufacturing
Medical devices
These sectors often require compressed air that meets the highest purity standards.
✅ 3. Lower Long-Term Maintenance
No oil changes, oil filters, or oil disposal — meaning fewer consumables and simpler servicing.
✅ 4. Energy Efficiency
Advanced designs and optional features like variable-speed drives (VSD) reduce energy use and operating costs.
✅ 5. Environmentally Friendly
Eliminating oil use removes the risk of oil leaks, reduces waste, and supports sustainability goals.
✅ 6. Reliable Continuous Operation
Oil-free screw technology can operate continuously under heavy duty cycles, providing steadier airflow without pulsation.
⚙️ Applications
Oil-free screw compressors are widely used where air purity and contamination avoidance are essential:
Food & Beverage Production — hygienic air for processing, bottling, packaging.
Pharmaceutical Manufacturing & Medical — sterile, contaminant-free air.
Electronics & Semiconductor Fabrication — clean air for precision manufacturing.
Textiles & Chemical Processing — where oils could harm products or chemicals.
