Propylene glycol, also known as 1,2-propanediol, is a colorless and odorless liquid chemical compound with the molecular formula C3H8O2. It is commonly used in various applications, including:
- Industrial Applications: Propylene glycol is used as a solvent for food colors and flavors, as well as in the manufacture of polyester resins, antifreeze, and hydraulic fluids.
- Pharmaceuticals: It is widely used as a solvent in oral, injectable, and topical pharmaceutical formulations. Propylene glycol can help dissolve active ingredients and improve the stability of medications.
- Cosmetics and Personal Care Products: It is used as a humectant to retain moisture in products such as skin creams, lotions, and hair care products. It also helps to prevent products from drying out or becoming too thick.
- Food and Beverage Industry: Propylene glycol is used as a food additive with the designation E1520. It is added to various food and beverage products as a solvent, preservative, and flavor carrier.
- Electronic Cigarettes (E-cigarettes): Propylene glycol is commonly used as a base ingredient in e-liquids used in vaping devices. It helps to produce vapor when heated and is considered safe for inhalation at typical levels found in e-cigarettes.
It's worth noting that propylene glycol is generally recognized as safe (GRAS) when used in accordance with good manufacturing practices. However, like any chemical substance, it should be handled with appropriate precautions to ensure safety.
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