Products Description
Propylene glycol, also known as 1,2-propanediol (CAS No. 57-55-6), is an organic compound with the chemical formula C₃H₈O₂ and a molecular weight of 76.10. It is a colorless, viscous, hygroscopic liquid with a faintly sweet taste and a mild alcoholic odor.
Chemical and Physical Properties
Propylene glycol is miscible with water, acetone, ethyl acetate, and chloroform. Its key physical properties include a melting point of approximately -60 °C, a boiling point of 187-189 °C, and a density of about 1.036 g/mL at 25 °C. It has a low vapor pressure and a flash point of 225 °F.
Applications
Propylene glycol serves as a versatile compound across multiple industries due to its solvent properties, low toxicity, and humectant characteristics.
1. Pharmaceuticals and Cosmetics: It is widely used as a solvent, humectant, and carrier in medicinal preparations. Common applications include serving as a solvent in oral solutions, syrups, topical creams, ointments, and as a vehicle in injectable formulations. In cosmetics, it functions as a skin conditioning agent and solvent.
2. Food Industry: Approved as a food additive, propylene glycol acts as an emulsifier, solvent for food colors and flavors, and a humectant.
3. Industrial Uses: It is employed as an antifreeze, a solvent in paints and coatings, a plasticizer, and a chemical intermediate in the production of unsaturated polyester resins and epoxy resins. Its derivatives, such as propylene glycol ethers, are important industrial solvents.
4. Other Applications: It is used in electronic cigarettes as a base for vapor production, in tobacco as a humectant, and as a lubricant for food processing equipment.
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Propylene Glycol Specification
| Item | Specification |
| Assay as PG on a dry basis (weight %) | Min 99.5 |
| Water (weight %) | Max 0.2 |
| Color, Pt-Co (APHA Color) | Max 10 |
| Specific Gravity @25/25C | 1.0350-1.0370 |
| Refractive Index @25C | 1.4310-1.4320 |
| Acidity (ml 0.1N NaOH/10ml) | Max 0.05 |
| Chloride as Cl (weight %) | Max 0.007 |
| Sulfate (weight %) | Max 0.006 |
| Heavy Metals as Pb (weight ppm) | Max 5 |
| Residue on Ignition (weight ppm) | Max 70 |
| Arsenic as As (weight ppm) | Max 1 |
| Iron (weight ppm) | Max 0.5 |
| Ethylene Glyco (weight %) | Max 0.008 |
| Diethylene Glyco (weight %) | Max 0.008 |
| Organic Volatile Impurities | pass |
| Distillation range (L)(degrees C) | 184-189 |
| Distillation range (U)(degrees C) | 184-189 |
| Distillation volume(Vol%) | Min 85 |
Propylene Glycol Packaging and Shipping Information
PACKING: 25KG NET IN PAPER BAG
STORAGE AND TRANSPORT: IN DRY AND COOL NORMAL TEMPERATURE
SHELF LIFE: 2 YEARS