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Propylene Glycol (CAS 57-55-6) is a colorless, odorless, and tasteless diol widely used across food, cosmetic, pharmaceutical, and industrial applications. Known for its safety, versatility, and excellent hygroscopic properties, it serves as a humectant, solvent, and emulsifier. Propylene Glycol is generally recognized as safe (GRAS) by regulatory bodies like the FDA for use in food and cosmetics, making it a trusted choice for diverse formulations.
Propylene Glycol, also known as 1,2-propanediol, is a synthetic organic compound with a molecular formula of C₃H₈O₂. It is a viscous, water-miscible liquid with a boiling point of approximately 188°C and a low toxicity profile. Its ability to retain moisture and dissolve a wide range of substances makes it ideal for food, personal care, pharmaceutical, and industrial applications.
Safe and Non-Toxic: GRAS status for food and cosmetic use, with ongoing safety studies.
Hygroscopic: Excellent moisture retention for food and skincare products.
Versatile Solvent: Miscible with water, alcohol, and many organic solvents.
Stable Performance: Suitable for high-purity applications in sensitive industries.
| Property | Premium Grade | First Grade |
| CAS Number | 57-55-6 | 57-55-6 |
| Appearance | Transparent Viscous Liquid, No Impurities | Transparent Viscous Liquid, No Impurities |
| Molecular Formula | C₃H₈O₂ | C₃H₈O₂ |
| Molecular Weight | 76.09 g/mol | 76.09 g/mol |
| Purity (% ≥) | 99.7 | 99.5 |
| Density (20°C, g/cm³) | 1.037–1.039 | 1.036–1.039 |
| Refractive Index (20°C) | 1.430–1.434 | 1.430–1.435 |
| Water Content (% ≤) | 0.1 | 0.2 |
| Chroma (Pt-Co, No. ≤) | 10 | 16 |
| Alkalinity (as OH⁻, mmol/100g ≤) | 0.04 | 0.05 |
| Boiling Point | 187–188°C | 187–188°C |
| Flash Point | ~99°C (closed cup) | ~99°C (closed cup) |
| Kinematic Viscosity (20°C) | ~60 mm²/s | ~60 mm²/s |
| Ash Content (% ≤) | 0.01 | 0.012 |
Propylene Glycol is a multi-functional compound used across various industries:
Food Industry:
Acts as a humectant to retain moisture in baked goods, candies, and processed foods.
Serves as a solvent for food flavorings and colors.
Used as an emulsifier to ensure uniform texture in dairy products.
Cosmetics and Personal Care:
Functions as a moisturizer in lotions, creams, and skincare products.
Enhances product stability in shampoos and deodorants.
Pharmaceuticals:
Used as a solvent in oral, injectable, and topical medications.
Acts as a carrier for active ingredients in drug formulations.
Industrial Applications:
Serves as an antifreeze in heating and cooling systems (non-toxic alternative to ethylene glycol).
Used as a solvent in the production of coatings, inks, and polymers.
Other Uses:
Component in e-liquids for vaping devices.
Used in fog machines for theatrical effects.
High Purity: Available in Premium and First Grade to meet diverse application needs.
Regulatory Compliance: Meets FDA, USP, and other global standards for food and pharmaceutical use.
Reliable Supply: Global distribution ensures timely delivery for bulk orders.
Expert Support: Our team provides technical guidance for optimal use in your applications.
Propylene Glycol is generally safe for its intended uses but requires proper handling:
Storage: Store in a cool, dry, well-ventilated area away from heat sources.
Handling: Use standard PPE (e.g., gloves, eye protection) to avoid skin or eye irritation.
Flammability: Moderate flash point (~99°C); avoid open flames or sparks.
Health Note: GRAS for food and cosmetic use, but excessive exposure may cause mild irritation. Consult the Safety Data Sheet (SDS) for detailed guidance.
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