Propylene Glycol, identified by its CAS number 57-55-6, is a fundamental organic chemical compound with widespread industrial and commercial significance. Its classification as a vicinal diol, or glycol, highlights its structure featuring two hydroxyl groups on adjacent carbon atoms (CH3CH(OH)CH2OH). This molecular architecture dictates its versatile behavior as a solvent, humectant, and chemical intermediate. For professionals in chemical procurement and R&D, understanding the detailed profile of this compound and its reliable sourcing is paramount.

Chemical and Physical Properties: The Foundation of Versatility

Propylene Glycol is a clear, viscous, colorless liquid that is nearly odorless and possesses a faintly sweet taste. Its key physical attributes include excellent miscibility with water, alcohols, acetone, and chloroform, while exhibiting limited solubility in aliphatic hydrocarbons and ethers. Its hygroscopic nature allows it to absorb moisture from the air, a property crucial for its function as a humectant. With a relatively high boiling point (188.2 °C) and a low vapor pressure, it is less volatile than water, contributing to its stability in various formulations. Its low toxicity profile, especially when compared to ethylene glycol, makes it a safer option for many applications, including those regulated by food and pharmaceutical authorities.

Industrial Production and Purity Grades

Commercially, Propylene Glycol is primarily synthesized from propylene oxide. Industrial production typically involves hydrolysis processes, which can be either catalytic or non-catalytic at high temperatures. The result is a chemical that can be refined into various grades, including industrial grade and USP/EP/BP grades, ensuring purity levels of 99.5% or higher. These different grades cater to specific industry requirements, from bulk industrial applications to the stringent demands of pharmaceutical and food manufacturing. For businesses looking to buy Propylene Glycol, selecting the appropriate grade is crucial for ensuring product performance and compliance.

Applications Across Key Sectors

The utility of Propylene Glycol spans numerous sectors:

  • Polymers: It is a key feedstock for unsaturated polyester resins, used extensively in reinforced plastics and coatings.
  • Food and Beverage: As a GRAS-approved additive, it functions as a humectant, solvent for flavors and colors, and emulsifier.
  • Pharmaceuticals: It serves as a solvent, stabilizer, and humectant in oral, topical, and injectable formulations.
  • Cosmetics and Personal Care: Valued as a humectant, solvent, and viscosity modifier in skincare, haircare, and makeup.
  • Antifreeze and De-icing: Utilized as a less toxic alternative to ethylene glycol, particularly in aviation and food-grade antifreeze applications.
  • Other Uses: Including theatrical fog, solvents for dyes, and humectants in tobacco products.

Sourcing Propylene Glycol: Your Partner in Chemical Supply

As a dedicated manufacturer and supplier in China, we offer a comprehensive range of Propylene Glycol products. We understand the importance of reliable sourcing, consistent quality, and competitive Propylene Glycol prices. Whether you require industrial volumes or specific high-purity grades, our robust supply chain ensures timely delivery. We are a trusted Propylene Glycol supplier committed to meeting the diverse needs of our global clientele. We encourage businesses to purchase Propylene Glycol from us to leverage our expertise and dependable supply.

To optimize your procurement process and ensure the highest quality for your applications, we invite you to contact us for detailed product information, quotes, and sample requests.