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Three properties of PAG that actually matter
Classification: Company News
Nov 12,2026
Three properties of PAG that actually matter
PAG — polyalkylene glycol — is not "a higher grade of synthetic." Its behaviour comes from the molecule.
Polarity, and the detergency that follows. Oxidation products tend to remain in the oil phase and leave with the drain, rather than baking onto hot metal as hard carbon or varnish. The same solvency is why PAG is often described as cleaning up existing sludge — and why a conversion needs watching: mobilised deposits end up in the filters, so element differential pressure deserves attention through the first few hundred hours.
High viscosity index. PAG grades typically sit above 150, with some near 200. From a cold start to fully loaded discharge, viscosity moves less and the film stays stable — valuable on sites with wide ambient swings or frequent cycling.
Low hydrocarbon solubility. In natural gas and process gas service, less gas dissolves into the oil, so the ISO VG 32 or 46 you specified is closer to the viscosity the bearings actually see.
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