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.
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.
The Ultima utilises an intelligent “digital gearbox“ design, which continuously monitors and independently adjust the speeds of each airend, ensuring maximum efficiency and pressure ratios at all times. When any regulated speed compressor gets to the minimum speed, it goes into idle run. For any compressor, this is wasted energy. Ultima uses 45% less energy in idle run than a conventional two-stage compressor and a 160kW compressor uses only 8 kW in idle run.
It is available with iConn remote monitoring. iConn is the all new and smart, proactive real-time monitoring service that delivers in-depth and real-time knowledge on the system to our compressed air users. It enables accurate production planning and total peace-of-mind protection, generating insight and statistics that keep users informed on performance, at the same time highlighting potential issues before they become a problem.
It's compact, low maintenance, high capacity, and exceeds industrial expectations.
100% oil and silicone free - Highest levels of air quality
Highest efficiency levels - Low running costs
Low noise design - Installation at point of use
LP & HP airends individually driven - Energy efficient across the flow range
Very efficient heat recovery - Most efficient machine
Easy installation - No ducting required
On-board monitoring - Very user-friendly
Available with iConn remote monitoring - IoT connected
Oil free air compressors are compressors that do not use oil inside the compression chamber — the part where air is compressed and delivered. Instead of oil, they rely on precision-engineered screw rotors, coatings, advanced cooling and sealing technologies to compress air cleanly.
This design means the compressed air delivered is free of oil contaminants, which is essential for many sensitive industrial and manufacturing processes.
🔹 Why Choose Oil Free Air Compressors?
✅ 100% Pure & Contaminant-Free Air
Oil free compressors eliminate all risk of oil carry-over into the compressed air stream — a must for sterile or quality-sensitive operations.
Typical industries that demand this level of air purity include:
Food & beverage processing
Pharmaceutical production
Medical device manufacturing
Electronics and semiconductor fabrication
Many models meet ISO 8573-1 Class 0 standards — the highest purity certification for compressed air.
✅ Lower Maintenance & Operating Costs
Since there’s no lubricating oil to change or manage, oil free compressors require:
Fewer consumables (no oil filters or separators)
Less downtime for oil changes
Less disposal of hazardous oil waste
All of this can add up to significant long-term savings, especially in continuous-use environments.
✅ Environmentally Friendly
Without oil leaks, spent oil disposal, or contaminated condensate, oil free compressors have a much smaller environmental footprint than oil-lubricated alternatives.
Oil free screw compressors are a subtype of oil free compressor using two intermeshing rotors (screws) to compress air. They are widely used at industrial scales because they can:
Deliver large volumes of pure air
Run continuously
Offer high reliability
Operate efficiently at higher capacities
Compared to smaller pi
