hylene Glycol (Monoethylene Glycol or MEG) is a clear, colorless, odorless, and slightly viscous liquid. It is primarily used as a raw material in the production of polyester fibers and as a major component in automotive antifreeze and coolant formulations.

Chemical Identity:

• Chemical Name: Monoethylene Glycol (MEG)

• Chemical Formula: C₂H₆O₂

• CAS Number: 107-21-1

• Molecular Weight: 62.07 g/mol

• Appearance: Clear, colorless, syrupy liquid

• Odor: Odorless or faint sweet odor

• Boiling Point: ~197°C

• Freezing Point: ~−12.9°C

• Solubility: Miscible with water, alcohols, and many organic solvents

Applications:

Coolants and Antifreeze:

• MEG is the main ingredient in radiator coolants and heat transfer fluids.
  
• Prevents freezing and boiling in automotive cooling systems.
  
• Requires dilution with water (typically 30–50% by volume).
  

Polyester Industry:

Used in the production of PET (polyethylene terephthalate) for bottles, films, and fibers.

Industrial Uses:

• Hydraulic fluids, deicing fluids, and solvents.

• Used as a dehydrating agent for natural gas.

  
  

  Humectants:
  

  In certain formulations like inks, adhesives, and cosmetics (limited due to toxicity concerns).