Today’s compressors are protected by a relatively small reservoir of fluid circulating through the components. High operating temperatures and moisture can wreak havoc on this thin strand of protection and on the long-term service life of the compressor fluid. With so much at stake, American Chemical Technologies, Inc. (ACT) has formulated polyalkylene glycol (PAG)-based synthetic compressor fluids that provide reliable protection under these demanding operating conditions. PAG compressor fluids from ACT are inert to water and are very thermally stable. PAG’s are polar molecules that produce polar byproducts that always remain soluble in the base stock. They are unique in that they are chemically incapable of producing insoluble varnish. Current formulations incorporating PAG base stocks are yielding 8 years of uninterrupted service life between fluid change outs. ACT is currently formulating the next generation of PAG-based synthetic compressor fluids, which are expected to achieve 12,000 hours of uninterrupted high performance service life.