Evans Cooling Systems site:
http://www.evanscooling.com/index2.htmlQuoting from
http://www.evanscooling.com/main20.htm :
Question: When should NPG+ be used instead of NPG?
Answer: NPG+ is preferred to NPG in all cases except where the ingredient ethylene glycol is specifically prohibited (e.g., use at certain race tracks).
Quoting from the Wikipedia entry for Ethylene glycol, at
http://en.wikipedia.org/wiki/Ethylene_glycol :
"The major use of ethylene glycol is as an antifreeze in, for example, automobiles and personal computers. Due to its low freezing point, it is also used as a deicing fluid for windshields and aircraft. Ethylene glycol is also commonly used in chilled water air conditioning systems that place either the chiller or air handlers outside, or systems that must cool below the freezing temperature of water."
"Ethylene glycol was first prepared in 1859 by the French chemist Charles-Adolphe Wurtz. It was produced on a small scale during World War I as a coolant and as an ingredient in explosives."
"The electrolysis of ethylene glycol solutions with a silver anode results in an exothermic reaction. In the Apollo 1 fire catastrophe a coolant consisting of ethylene glycol and water was implicated as a possible cause via this reaction."
Dave
http://www.roadsters.com/