When Class 0 oil free air – For applications in which air purity is essential, our compressors are tested to meet oil free requirements under ISO8573-1. Oil free air power is essential to help ensure product quality and safety for many operations. When air purity is this critical, having a reliable oil free air compressor is key. Hitachi Global Air Power Oil Free Compressed Air Solutions bring you air compressors backed by 100 years of Hitachi engineering experience and the reliability Sullair is known for.