Propylene is a chemical compound that is used in many everyday products. It is a type of gas that can be turned into a liquid and is often used to make plastics, fibers, and cleaning products. Full definition
Much of the controversy is over the use of propylene glycol in Purina's Beneful dry kibble — and the fact that it also is an ingredient in some antifreeze. (petproductnews.com)
There are some safer antifreeze products available made of propylene glycol instead of the toxic ethylene glycol. (catbehaviorassociates.com)
Some antifreeze products contain propylene glycol instead, which is not as dangerous if ingested in small amounts. (healthypets.mercola.com)