CAS: 57-55-6
Alias: 1,2-Propanediol; Methyl Glycol; 1,2-Dihydroxypropane
Molecular Formula: C₃H₈O₂
Relative Molecular Mass: 76.09 g/mol
【Structural Formula】
1. Product Property
Propylene glycol is a colorless, odorless, and slightly viscous liquid with excellent hygroscopicity and low toxicity. It is fully miscible with water, alcohols, and many organic solvents. With a high boiling point and low freezing point, it offers strong solubility, chemical stability, and good compatibility with a wide range of substances. These features make it ideal for use in industrial applications requiring moisture retention, heat transfer, or solvent properties
2. Quality Standard
| Parameter | Specification |
| Appearance | Clear, colorless liquid |
| Purity (%) | ≥ 99.5 |
| Water Content (wt%) | ≤ 0.5 |
| Density (20°C, g/cm³) | 1.035 – 1.040 |
| Boiling Range (°C) | 185 – 189 (≥ 95% v/v) |
| Acidity (as acetic acid) | ≤ 0.005% |
| Residue on Evaporation | ≤ 0.01% |
| Heavy Metals (as Pb) | ≤ 10 ppm |
| Iron (Fe) | ≤ 1 ppm |
3. Application Scope and Usage
Propylene glycol is widely used in industrial applications due to its solvent, humectant, and preservative properties. It serves as a key ingredient in antifreeze and coolant formulations, hydraulic fluids, and heat transfer systems. In the chemical industry, it acts as a solvent for resins, paints, coatings, and plasticizers. It is also used in the production of unsaturated polyester resins and as a carrier in flavor and fragrance formulations. Its low toxicity and stability make it suitable for use in food processing, cosmetics, and pharmaceuticals as well
4. Package and Storage
Propylene glycol should be stored in tightly sealed containers made of stainless steel, aluminum, epoxy-lined drums, or high-density polyethylene (HDPE). It is typically packed in 200-liter steel or plastic drums, or in ISO tanks for bulk transport. It should be kept in a cool, dry, and well-ventilated area, away from direct sunlight, heat sources, and oxidizing agents. Proper storage conditions help maintain product quality and prevent contamination.
