Propylene glycol CAS 57-55-6

Propylene glycol, often abbreviated as PG, is a synthetic organic compound with the chemical formula C3H8O2. It is a colorless, odorless, and tasteless liquid that is hygroscopic, meaning it can absorb and retain moisture from its surroundings. Propylene glycol is used in various applications due to its unique properties. Here are some of its common uses:

Food and Beverage Industry: Propylene glycol is used as a food additive, specifically as a humectant (moisture-retaining agent), emulsifier, and stabilizer. It helps prevent food products from drying out and maintains their texture. It is generally recognized as safe (GRAS) by the U.S. Food and Drug Administration (FDA).

Pharmaceuticals: Propylene glycol is used as a carrier for various pharmaceutical drugs, especially in oral, topical, and injectable medications. It helps dissolve active ingredients and ensure their consistent distribution in the formulation.

Cosmetics and Personal Care Products: It is commonly found in cosmetics, skin care products, and toiletries such as lotions, creams, shampoos, and deodorants. Propylene glycol helps these products maintain moisture, consistency, and stability.

Antifreeze and Coolants: Propylene glycol is a key ingredient in some automotive antifreeze and engine coolant formulations. It serves as a non-toxic alternative to ethylene glycol, which is more toxic if ingested.

Detergents and Cleaners: It is used in some household and industrial cleaning products to enhance the stability and viscosity of the formulations.

Electronic Cigarettes (E-Cigarettes or Vaping): Propylene glycol is one of the main ingredients in the e-liquid used in electronic cigarettes. It helps create the visible vapor when heated and contributes to the throat hit sensation for users.

Industrial Applications: Propylene glycol is used in various industrial processes, including as a coolant in refrigeration systems, a heat transfer fluid, and a de-icing agent for aircraft.

Humidification: In some cases, propylene glycol is used in humidification systems to help maintain humidity levels in controlled environments.

It's important to note that there are different grades of propylene glycol, including USP (United States Pharmacopeia) and industrial grades. The USP-grade is the highest purity level and is suitable for use in pharmaceuticals and food products. Industrial-grade propylene glycol may have additional impurities and is typically used in non-food and non-pharmaceutical applications. Always use the appropriate grade for your specific application, and follow safety guidelines and regulations when handling propylene glycol.

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