Comparing Ethylene Glycol and Propylene Glycol

Comparing the properties of ethylene glycol and propylene glycol

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The characteristics of ethylene glycol and propylene glycol can be compared as

Property Ethylene Glycol Propylene Glycol Comments
Freeze point depression more effective less effective More antifreeze is needed of propylene glycol to achieve the same freeze point
Heat transfer efficiency less better Ethylene glycol can't carry as much heat as propylene glycol. More fluid must be circulated to transfer the same amount of energy. Pumps volume increased.
Viscosity lower higher Propylene glycol increases major head loss in the systems. Pumps head increased.
Flammability low low
Chemical oxygen demand low higher  
Biodegrading degrades in 10 - 30 days needs more than 20 - 30 days to degrade
Carcinogenic no no A carcinogen is any substance or agent that promotes cancer
Toxic High level of acute when taken orally, targets the kidneys Lower level of acute Ethylene glycol should never be used in any drinking water or food processing system
Skin irritant low low Propylene glycol is used in small amounts in cosmetics

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Related Topics

  • Material Properties Material properties - density, heat capacity, viscosity and more - for gases, fluids and solids
  • Air Condition Systems Air Condition systems - heating, cooling and dehumidification of indoor air for thermal comfort

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