What is PG?
Propylene glycol is clear, colorless, and almost completely odorless. It is a slightly viscous, water-soluble, and hygroscopic liquid. PG is essentially a synthetic liquid substance that carries the profound ability to absorb water. It even has the ability to absorb water from the air around it, making it valuable to products which need to maintain moisture. The Food and Drug Administration (FDA) has classified propylene glycol as an additive that is safe for use in food.
Propylene is most commonly used in the areas of pharmaceuticals, foods, beverages, cosmetics and personal care products, and eliquids. It is used to absorb extra water, and to maintain moisture in certain medicines, cosmetics, or food products. Propylene glycol is also used to create artificial smoke or fog used in fire and rescue training, and in theatrical productions.
PG has a very low vapor pressure, which allows it to create clouds of thick vapor at low heat settings. Propylene glycol also provides ejuice mixtures with more of a throat hit than VG formulas, with less of a sweet taste.