lean Compressed Air: What You Need to Know | Airstone Guide

For many manufacturing facilities, compressed air is treated as a universal utility. However, most operators overlook that contaminated compressed air — especially oil residue — can ruin batches of finished products, cause unexpected downtime, and result in costly compliance failures.

So what truly counts as clean compressed air?

According to ISO 8573‑1, Class 0 is the strictest standard for oil‑free compressed air. It guarantees virtually zero residual oil content in output air, which is the core definition of clean air for sensitive production. As a professional manufacturer, Airstone provides three mature Class 0 oil‑free compressor solutions: water‑injected oil‑free screw, dry oil‑free screw, and oil‑free scroll compressors. Each technology carries unique features and serves different industrial scenarios.

Water Lubricated Oil-Free Screw Air Compressor

Airstone water‑injected oil‑free screw compressor applies purified water for rotor sealing, lubrication and cooling inside compression chamber. Near‑isothermal compression keeps operating temperature below 50°C. It delivers stable ISO 8573‑1 Class 0 clean air with outstanding energy‑saving performance, around 15% higher efficiency than dry‑type oil‑free screw compressors. Regular maintenance for the water circulation system is required for long‑term reliable operation.

Best‑fit industries: Pharmaceutical, food & beverage, bottling lines, electronics assembly, fine chemical, medium‑and‑large scale production plants.

Dry Oil-Free Screw Air Compressor

Airstone dry oil‑free screw compressor adopts two‑stage dry compression with high‑performance coated rotors. No liquid is injected into compression cavity during operation. Discharge temperature reaches 180‑200°C. Without water circuit design, it suits heavy‑duty non‑stop running. Please note rotor coating will wear gradually, so periodic inspection and overhaul are necessary, and its power consumption is relatively higher than water‑injected models.

Best‑fit industries: Textile, petrochemical, power station, cement plant, large‑capacity sites lacking stable water supply.

Oil-Free Scroll Compressor

Airstone oil‑free scroll compressor realises air compression via orbiting and fixed scroll plates. No metal‑to‑metal contact occurs inside the compression chamber. It stands out for ultra‑low noise, compact footprint and simple structure. This unit is designed for small‑to‑medium air flow demand.

Best‑fit industries: Medical & dental clinics, laboratories, precision electronics, small food workshops, clean‑room auxiliary air supply.

How Airstone Helps You Make the Right Choice

Small air demand & noise‑sensitive site → Airstone Oil‑Free Scroll Compressor

Medium‑large air consumption, focus on energy saving & low total operating cost → Airstone Water‑Injected Oil‑Free Screw Compressor

Heavy‑load large‑capacity plant without reliable water source → Airstone Dry Oil‑Free Screw Compressor

All Airstone three series achieve ISO 8573‑1 Class 0 certification for 100% oil‑free compressed air.

If you are confused about selecting proper clean compressed‑air equipment for your process, feel free to reach out to Airstone technical team for customised solution and proposal.