Key Properties
1,2-Propylene Glycol (PG) is a diol with the molecular formula C₃H₈O₂ and CAS No. 57-55-6. It is a clear, colorless, viscous liquid with low volatility and hygroscopic properties. It has a boiling point of approximately 188 °C and is fully miscible with water and many organic solvents. It is widely recognized for its safety and is approved for use in food, pharmaceutical, and cosmetic applications.
Key Features
Propylene Glycol is a versatile solvent, humectant, and stabilizer with excellent moisture-retention capability. It provides good compatibility with active ingredients, enhances product stability, and improves texture in formulations. Its low toxicity and GRAS status make it suitable for food-grade and pharmaceutical-grade applications, while also being widely used in industrial systems.
Main Applications
Propylene Glycol is widely used in food and beverage formulations as a solvent for flavors and colors, as well as a humectant to retain moisture. In pharmaceuticals and cosmetics, it is used in creams, lotions, gels, shampoos, and personal care products as a moisturizer and carrier. In industrial applications, it is used in antifreeze, coolants, hydraulic fluids, resins, coatings, and as a solvent in inks and adhesives.
Production Process
Propylene Glycol is primarily produced from propylene oxide through hydrolysis. The reaction yields propylene glycol, which is then purified through distillation to obtain industrial-grade, food-grade, or pharmaceutical-grade products.
