Next, here is the MSDS for good ole Prestone. In Section 9, it lists the freezing point of Prestone as about -35F (-37C). Hmm. That's well below the +9F freezing point of pure ethylene glycol! What gives? Based on the previous chart, that indicates a mixture of about 90 percent ethylene glycol. Well, go back to Section 3 of the MSDS. It vaguely reports the ethylene glycol composition as "75-95%", with up to 15 percent other ingredients (presumably corrosion inhibitors). That leaves up to 10 percent of the composition unaccounted for! I suspect that 10 percent is water, which would agree perfectly with the -35F freezing point. (I don't think water has to be disclosed on an MSDS.)
Why the water? I can think of three reasons:
1. The glycol/water mixture won't freeze or thicken at any temperature where someone is likely to be servicing a vehicle; it would really bum you out it you went to add antifreeze to your car at ten below and it wouldn't pour out of the jug.
2. The corrosion inhibitors might not dissolve in pure glycol.
3. Water is cheaper than ethylene glycol.
Conclusion: "straight" antifreeze is not straight ethylene glycol.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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