The choice between oil-injected and oil-free air depends on your air quality requirement. Oil-injected machines are cheaper and common in general industry, while oil-free machines are essential where oil contamination is unacceptable.
Air Quality Requirements
- Oil-injected air contains trace oil that filtration can reduce but not fully remove.
- Oil-free air is certified clean and required by food, medical and electronics standards.
- Match the technology to your ISO 8573 air purity class.
Cost and Maintenance
- Oil-injected machines cost less and are easier to service.
- Oil-free machines need specialized rotors and have a higher initial cost.
- Consider oil-free screw compressors for critical applications.
Typical Applications
- Oil-injected: manufacturing, mining, construction, workshops.
- Oil-free: pharmaceuticals, food and beverage, electronics, medical air.
Can filters make oil-injected air oil-free?
Filtration removes most oil but cannot guarantee a truly oil-free supply. Certified oil-free air needs an oil-free compressor.
Talk to an Engineer
Contact Panrui with your flow, pressure and air quality requirements to get a recommendation and factory quote for your project.