Propylene glycol

Propylene glycol

1,2-Propanediol; Propane-1,2-diol; Methyl glycol

CAS 57-55-6

Chemical Formula C₃H₈O₂

Molecular Weight 76.09 g/mol

Propylene glycol is a synthetic organic compound that is commonly used as a colorless, odorless, and slightly viscous liquid. It is a synthetic liquid substance that absorbs water. Propylene glycol is also used to make polyester compounds, and as a base for deicing solutions. Industrially, Propylene glycol is mainly produced from propylene oxide.

Industrial Uses

1. Food & Beverage

  • Emulsifying Agent: Propylene glycol is used to stabilize emulsions in sauces, dressings, and processed foods, ensuring that water and oil-based ingredients remain mixed.
  • Anti-caking Agent: In powdered foods, such as seasonings or instant mixes, Propylene glycol prevents clumping by absorbing moisture from the air.

2. Sealants & Adhesives

  • Plasticizer: Propylene glycol is a plasticizer in sealants and adhesives, enhancing flexibility and durability, preventing cracks or brittleness over time.
  • Stabilizer: It acts as a stabilizing agent in adhesives, ensuring that the consistency remains even and the adhesive bonds effectively.

3. Pulp & Paper Solutions

  • Anti-dusting Agent: In paper manufacturing, Propylene glycol is added to reduce dust formation, helping maintain a cleaner production environment.
  • Moisture Retention: Its humectant properties help retain moisture in paper products, improving their texture and reducing brittleness.

4. Construction

  • Concrete Additive: It enhances the workability of concrete and is used as a plasticizer to control the setting time, improving the performance of concrete in construction projects.
  • Anti-freeze Additive: Propylene glycol is included in construction materials to prevent freezing in colder climates, ensuring materials like grout and cement can set properly.

5. Oil & Gas

  • Dehydrating Agent: In natural gas processing, Propylene glycol is used to absorb moisture from the gas, preventing the formation of hydrates that could block pipelines.
  • Corrosion Control: It is used in formulations designed to prevent corrosion in equipment used in oil and gas extraction.

6. Animal Healthcare

  • Energy Source for Cattle: Propylene glycol is used as an energy supplement for dairy cattle, particularly to prevent ketosis by increasing glucose levels.
  • Medication Carrier: It acts as a solvent and carrier in veterinary medications, improving the delivery of drugs for livestock and pets.

Specifications

Assay ≥ 99%
Appearance Clear, colorless to pale yellow liquid
Odor Pungent, characteristic odor
Boiling Point 114–115°C (237–239°F)
Melting Point −52°C (−61.6°F)
Density 0.948 g/cm³ at 20°C
Solubility Miscible with water, ethanol, and acetone
Viscosity 2.14 mPa·s at 20°C
Flash Point 35°C (95°F) (closed cup)

Hazard Symbols

Irritants/Sensitisers/Other Hazards
Environmental Hazard