Quote:
Originally Posted by Cusser
Most modern coolants contain stuff like potassium 2-ethylhexanoate as inhibitor, that's what the Chevron Dexcool MSDS sheet lists; that's a sodium soap. And guess what: I'm in the soap analysis business, think I'll see take in some sample and assay it to see which organic acid is in the Peak; their MSDS states proprietary organic acid technology (soap is neutralized fatty acid), so may be exactly the same as the DexCool. Some brands like Ashland MSDS list 2-ethylhexanoic acid and potassium hydroxide, which makes - guess what: potassium 2-ethylhexanoate. Very few modern coolants contain silicates or phosphates like in the old days.
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j cAT - Had some time today, brought in a sample of my Peak 50/50 coolant detailed earlier in this thread, which stated "For all Vehicles and Makes" and looked at it in the lab. It was about 5% solids, after the water and ethylene glycol had been driven off. FTIR of those solids indicated a soap, and gas chromatography interfaced with mass spectrometry identified the soap as being primarily from 2-ethyl hexanoic acid. So that means the same as genuine DexCool. So that's proof positive. But one can't call it DexCool unless one pays the licensing charge, like only Kimberly-Clark can legally call their tissues "Kleenex".
By the way, those old-style coolants which contain silicates and phosphates are too alkaline for aluminum parts, why they're no longer used in modern engines.