Patent ID: 7655154

Claim:
A reduced toxicity, ethylene glycol and propylene glycol based, non-aqueous heat transfer fluid, which can be used as an engine coolant in environmental conditions ranging from ambient temperatures of −35° F. to +130° F., for use in a heat exchange system without any addition of water, said non-aqueous heat transfer fluid comprising: (a) ethylene glycol, wherein the ethylene glycol comprises about 70 percent by weight of the total weight of the ethylene glycol and propylene glycol in the non-aqueous heat transfer fluid; (b) propylene glycol, wherein the propylene glycol comprises about 30 percent by weight of the total weight of the ethylene glycol and the propylene glycol in the non-aqueous heat transfer fluid; (c) at least one corrosion inhibitor additive that is soluble in ethylene glycol and propylene glycol selected from the group consisting of a molybdate salt, a nitrate salt and an azole, wherein the non-aqueous heat transfer fluid contains no additives that require water to be present in the fluid to dissolve the additives or to otherwise enable the additives to function.