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PROPYLENE GLYCOL: COMMON USES, SPECIFICATIONS, and WHERE TO BUY  Propylene glycol Propylene glycol  is a near odorless, clear, colorless, viscous liquid,  and which possesses a faintly sweet taste. The chemical formula is CH 3 CH(OH)CH 2 OH.   Propylene glycol, also known by the abbreviation, PG,  is widely used since it is miscible water and a  broad range of other solvents, acetone, and chloroform. Like most glycols, PG, in general is non-irritating and has low  volatility.  The CAS number for Propylene Glycol is  57-55-6 PG is major industrial chemical and it is produced on a large scale primarily for the production of polymers, and  as a very useful intermediate for other chemicals. In 2019 nearly 2  million metric tons were produced.   It is used in all kinds of commerical, industrial and even sme home uses. PG is  used in making aircraft deicing fluids, and also has uses in applications like home and auto products, and since it is considered GRAS (see below) also in food products