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Several copolymeric perfluoropolyether (PFPE) lubricants, produced by Ausimont via the photooxidative method, and having the following names and schematic structures: have been studied with respect to the following molecular and physical characteristics: Chemical structure and composition Average molecular weight M Glass transition temperature Tg Viscosity and temperature coefficient of viscosity. The extensive data collected on a number of PFPE oils of different structure, composition and molecular weight have been used to show the complex interrelationship existing between the various structural parameters that control the viscosity of these lubricants.