Monopropylene glycol (MPG) is a versatile chemical compound that is used in a wide range of industries and applications. Here are some of the major or common uses of MPG:

1. Food and Beverage Industry: MPG is used as a solvent, humectant, and stabilizer in food and beverage products, including soft drinks, baked goods, flavorings, and food coloring.
2. Pharmaceutical Industry: MPG is used as a solvent, excipient, and co-solvent in various pharmaceutical products, including oral liquids, topical creams, and injectable formulations.
3. Cosmetics and Personal Care Industry: MPG is used as a solvent, humectant, and viscosity modifier in a wide range of cosmetic and personal care products, including lotions, creams, shampoos, and deodorants.
4. Chemical Industry: MPG is used as a chemical intermediate for the production of various chemicals, including unsaturated polyester resins, plasticizers, and detergents.
5. HVAC Industry: MPG is used as a heat transfer fluid in HVAC (heating, ventilation, and air conditioning) systems.
6. Electronic Cigarette Industry: MPG is used as a base liquid for the production of e-liquids for electronic cigarettes.
7. Animal Feed Industry: MPG is used as a feed additive for livestock to prevent dehydration and promote feed intake.