Propylene Glycol (PG)

 

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:

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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).

Propylene Glycol (PG)

 

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:

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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

 

Propylene Glycol (PG)

Technical Data Sheet of Propylene Glycol (PG) 1