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Resource Center FAQ What is the difference between ethylene and propylene glycol?

Ethylene glycol is the less expensive option but it is also toxic.  It has lower negative impact on heat transfer as well as pump performance. Propylene glycol can be up to 15% more expensive than ethylene and with its higher viscosity inhibits heat transfer and pump performance more.  However, it is non-toxic which over the past 10 years has made it the preferred choice of industrial cooling systems.