Oil Free Air Compressors

You may have no choice over the quality of the compressed air used in your process – especially in the food and beverage, and, pharmaceutical industries – it just has to be absolutely contaminant free.

Air purity is critical for many applications where even the smallest drop of oil can cause product spoilage or damage the production equipment, resulting in potential unplanned downtime.

There are many options available to ensure your production runs smoothly and to industrial standards, and Direct Air are happy to advise on what would be the ideal solution for your circumstance.

West Midlands: See our air compressor services in Birmingham, Coventry & West Midlands

South West: See our air compressor services in Bristol, Gloucester, Cheltenham & the South West

ISO 8573-1 Class 0 Compressed Air

Direct Air can advise on the most suitable means to deliver an acceptable level of oil free compressed air from your existing or new system.

Compressed air purity classes for particles

ISO8573-1:2010 CLASS

Solid ParticulateWaterOil
Maximum number of particles per m³Mass Concentration mg/m³Vapour Pressure DewpointLiquid g/m³Total Oil (aerosol liquid and vapour)
0.1 – 0.5 micron0.5 – 1 micron1 – 5 micronmg/m³
0As specified by the equipment user or supplier and more stingent than Class 1
1≤ 20,000≤ 400≤ 10≤ -70℃0.01
2≤ 400,000≤ 6,000≤ 100≤ -40℃0.1
3≤ 90,000≤ 1,000≤ -20℃1
4≤ 10,000≤ +3℃5
5≤ 100,000≤ 7℃
6≤ 5≤ -10℃
75 – 10≤ 0.5
80.5 – 5
95 – 10
X> 10> 1010

Oil free compressors

Many manufacturers in critical applications industries choose ISO 8573-1 Class Zero oil-free compressors that provide clean, 100 percent oil-free air. However atmospheric conditions can lead to oil vapour being present in the air generated from an oil free air compressor.

Therefore, additional filtration may be necessary for the system as a whole or point of use depending upon the application.

As with all systems a detailed analysis of the process requirements is the best solution to ensure that the delivered air quality is suitable for the application.

The future of oil-free compressor design


To deliver oil free compressed air filtration is generally required even in a system that has oil free compressors. Oil free air can also be achieved in systems that have oil lubricated compressors installed.

Depending upon the class of air required Direct Air can advise on how oil free air can be delivered to your system.

Filtration systems including activated carbon filters, activated carbon towers or BEKOKAT catalytic solutions are all possible ways that may be considered to generate oil free air suitable for your process needs.

More info about Air Treatment

Find your oil free solution

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We offer complete compressed air solutions including design, installation, servicing & WSE inspections.


We consider your entire compressed air system from the compressor to downstream equipment & pipework.

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Whatever the industry and whatever the application, there's a growing demand for higher-quality compressed air.

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