Propylene Glycol Industrial Grade (PGI) is a colorless, odorless and slightly viscous liquid. Because of its versatility propylene glycol is used in a variety of applications in aqueous solutions and over a wide temperature range.
Benefits and Applications
PGI is used to produce unsaturated polyester resins for bathroom fixtures and boat hulls; lower toxicity antifreeze, coolants and aircraft deicers; and cleaners.
Propylene glycol has an unsurpassed reputation for safe use in many applications.
The U.S. Food and Drug Administration has given propylene glycol the same classification given to common products such as vinegar and table salt: Generally Recognized As Safe (GRAS).
Storage and Handling
Due to its low vapor pressure, toxicity and flammability, propylene glycol presents no special handling problems. However, overexposure or spillage should be strictly avoided as a matter of good safety practice.
Propylene glycol may require storage facilities designed to prevent moisture intrusion because of its hygroscopic nature. Storage vessels and transfer lines of mild steel may be used if slight increases in color and trace iron levels are not objectionable. Stainless steel and/or mild steel vessels with baked phenolic or epoxy-phenolic linings are recommended to promote long-term storage and to maintain high quality.