Melting points of polyethylene glycols (PEGs) with molar masses (1500, 4000, 10000 and 35 000) g/mol under pressure of propane and sulfur hexafluoride have been determined and were compared with previous published data with CO2 and argon. Additionally, solubilities of argon and CO2 in PEGs have been determined along the melting curve. The desorption of gases from PEG to constant mass at atmospheric conditions was followed for propane, CO2, argon and SF6-previously the system was exposed to conditions 343 K and 15 MPa. Finally, PGSS micronization of PEG with molar mass 1500 g/mol with fluids propane, CO2, argon and SF6 was successfully performed at two operating conditions: at the minimal melting point of PEG under fluid and at 328 K and 15 MPa. This is the first report of PEG micronization with unconventional fluids: propane, SF6 and argon. (C) 2016 Elsevier B.V. All rights reserved.