Antifreeze is a crucial component in cooling systems, preventing the coolant from freezing in cold temperatures and boiling over in hot conditions. Two common substances used in antifreeze formulations are propylene glycol (PG) and mono ethylene glycol (MEG). This article will compare these two substances in the context of their difference in antifreeze.
What is antifreeze?
Most antifreeze formulations are a mix of high purity water (such as deionised water) and ethylene glycol. Multi-metal and multi-function inhibitors are also added to prevent internal corrosion, scaling and biological fouling.Antifreeze plays two critical roles in protecting heating and cooling systems. Firstly, it lowers the freezing point of water, allowing systems to flow freely and avoid expensive freeze-ups during winter's sub-zero temperatures. Secondly, it raises the boiling point of water to prevent any over-heating issues.
What is the difference between propylene glycol and ethylene glycol?
Propylene Glycol (PG)
Propylene Glycol has the chemical formula C3H802. it is also a colourless, odourless liquid. It has heat transfer properties in the temperature range of -50°F to 350°F. PG is completely miscible in water, ethanol, diethyl ether, acetone and chloroform.
PG has heat transfer capabilities, but is slightly less efficient than MEG; however, it is still sufficient to lower the freezing point and raise the boiling point of coolants, providing effective freeze protection. ,
1,2-Propanediol (PG) requires a higher concentration to lower the freezing point of water, and because of its lower toxicity, it is widely used in a number of consumer-friendly antifreeze products.
Ethylene glycol (MEG)
Ethylene glycol has the chemical formula C2H602. it is a colourless, nil, viscous liquid. It has two hydroxyl groups - OH) which gives it high thermal stability. Glycol has excellent heat resistance and low viscosity, properties that are essential for efficient flow in cooling systems.
Glycol is extremely efficient in heat transfer. It effectively absorbs and dissipates heat generated by the engine. This property helps prevent overheating and ensures smooth operation of the cooling system. It is widely used in automotive engines and industrial cooling systems.
MEG can provide a low freezing point for coolant mixtures. Enables cooling systems to operate effectively in extremely cold environments.
Toxicity Impact
monoethylene glycol is toxic to humans and causes a range of physiological problems, it is absorbed in the body through the skin (transdermal route), respiratory system and gastrointestinal tract, therefore, ethylene glycol should not be used in applications where it may contaminate drinking water. MEG should also not be used in heating or cooling systems in food processing plants or other consumer product manufacturing sites.
Propylene glycol has significantly lower toxicity. The U.S. Food and Drug Administration (FDA) considers it to be generally safe for use in food and cosmetics. When ingested, it is excreted in the urine or converted to lactic acid and other normal metabolites. Propylene glycol is also more readily biodegradable and therefore has a lower environmental impact than MEG.
Gneebio supplies both ethylene glycol and propylene glycol. For more information on selecting the right glycol for your application or formulation please contact us.
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