Antifreeze Ethylene Glycol and Propylene Glycol
Comparing ethylene glycol and propylene glycol properties as antifreeze
Characteristics of ethylene glycol and propylene glycol as antifreeze:
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/capability | better | less | Ethylene glycol has superior heat transfer efficiency due to lower viscosity - but more fluid must be circulated to transfer the same amount of energy since Propylene glycol has higher specific heat. |
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 |
- more about ethylene glycol
- more about propylene glycol
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