
Description of Propylene Glycol
Propylene Glycol (PG) is a synthetic, colorless, and odorless liquid compound with the chemical formula C₃H₈O₂, prized for its ability to dissolve a variety of substances. As a versatile, moisture-retaining agent, it’s frequently used across industries from pharmaceuticals to food and industrial applications.
Properties
- Appearance: Clear, viscous, colorless liquid
- Odor: Nearly odorless, with a faintly sweet taste
- Solubility: Completely soluble in water and many organic solvents
- Boiling Point: ~188.2 °C
- Melting Point: ~ -59 °C
Application of Propylene Glycol (PG)
Propylene Glycol (PG) is widely used across multiple industries due to its ability to retain moisture, dissolve various substances, and stabilize products. Here’s a look at some of its primary applications:
- Pharmaceuticals and Medicine
Uses: Acts as a solvent, carrier, and stabilizer in both oral and injectable medications, enhancing the stability and absorption of active ingredients.
Examples: Found in cough syrups, injectable medicines, and topical formulations. - Food and Beverage Industry
Uses: Works as a humectant to maintain moisture, an emulsifier to blend ingredients, and a preservative to extend shelf life.
Examples: Often used in packaged foods, baked goods, and food flavorings. - Cosmetics and Personal Care
Uses: Provides moisture retention and smoothness, improving product texture and enhancing hydration in skin and hair products.
Examples: Common in lotions, creams, deodorants, shampoos, and conditioners. - Industrial and Chemical Applications
Uses: Used in antifreeze, de-icing solutions, and hydraulic fluids due to its low freezing point and heat-transfer properties. It’s also used as a coolant in HVAC systems and refrigeration.
Examples: Found in airplane de-icing solutions, automotive antifreeze, and cooling systems for industrial machinery. - E-cigarettes and Vape Liquids
Uses: Propylene glycol is a primary base in vape liquids, carrying nicotine and flavors while producing vapor.
Examples: Mixed with vegetable glycerin in e-liquid formulations for a balanced vaping experience. - Pet Food and Animal Feed
Uses: Sometimes included in pet food to maintain moisture and consistency, although usage is regulated to ensure safety.
Examples: Found in certain wet and semi-moist dog foods (in approved amounts).

Advantages of Propylene Glycol (PG)
Propylene Glycol (PG) offers numerous advantages that make it a valuable component across various industries. Here are some of its primary benefits:
- Effective Moisture Retention
Benefit: PG is an excellent humectant, meaning it retains moisture effectively, which is essential for keeping products hydrated.
Applications: Found in food, cosmetics, and personal care products, helping prevent drying and enhancing texture and smoothness. - Versatile Solvent
Benefit: Its ability to dissolve a wide range of substances, including active pharmaceutical ingredients, flavors, and colors, makes it ideal for various formulations.
Applications: Used in medications, food additives, and cosmetics where consistent, stable mixtures are required. - Stability and Shelf Life Enhancement
Benefit: PG helps extend the shelf life of products by maintaining stability, reducing oxidation, and acting as a preservative in some formulations.
Applications: Widely used in processed foods and pharmaceuticals to prolong freshness and efficacy. - Low Toxicity and Safety Profile
Benefit: Considered safe for consumption in regulated amounts, propylene glycol is non-toxic at prescribed levels, making it suitable for food, cosmetic, and pharmaceutical applications.
Applications: Approved by health authorities like the FDA, PG is used in ingestible and topical products with established safety guidelines. - Thermal Stability and Heat Transfer
Benefit: PG has excellent thermal stability and a low freezing point, making it an ideal heat transfer fluid for cooling and antifreeze applications.
Applications: Commonly used in industrial settings, automotive antifreeze, and HVAC systems, where temperature regulation is essential. - Biodegradability
Benefit: Unlike some industrial chemicals, PG is biodegradable and environmentally friendly when managed properly, minimizing its environmental footprint.
Applications: Used in applications where ecological impact is a consideration, such as de-icing agents and coolants. - Smooth Vapor Production
Benefit: When heated, PG produces a smooth vapor, making it an ideal base for e-cigarettes and vaping products.
Applications: Mixed with glycerin in vape liquids, PG provides a balanced vapor experience while carrying flavors effectively.
Packing of Propylene Glycol
Its packed in 180 kg drums, iso tank, flexi tanks and bulk shipments. Each 20 foot container takes 80 drum.
Safety
- Generally considered safe for human use when used in appropriate amounts.
- May cause skin irritation in some individuals.
- Important to follow product instructions and guidelines.
Technical Data Sheet of Propylene Glycol (PG)
| Property | Value |
| Chemical Formula | C₃H₈O₂ |
| CAS Number | 57-55-6 |
| Molecular Weight | 76.09 g/mol |
| Appearance | Clear, colorless, viscous liquid |
| Odor | Nearly odorless, faintly sweet |
| Boiling Point | 188.2 °C |
| Melting Point | -59 °C |
| Density | 1.036 g/cm³ at 20 °C |
| Viscosity | 58.1 mPa·s at 20 °C |
| Vapor Pressure | 0.129 Pa at 25 °C |
| Flash Point | 104 °C (closed cup) |
| Auto-Ignition Temperature | 371 °C |
| pH | Neutral (7) |
| Solubility | Fully soluble in water |
| Refractive Index | 1.4324 at 20 °C |



