Hal,
I think they're different types or strengths of ethylene glycol and there is an
anti-freeze type. Dupont is the main seller of this and what they sell for
anti-freeze is called "monoethylene glycol". It's still ethylene glycol but
they mix some other stuff with it. They call it "ethylene glycol which is
blended with proprietary additives and sold for use as coolant in automobiles".
I think they thin it down plus add additives to stop it's corrosive effects. I
know borax was added years ago and seems like an alcohol of some sort, I cant
remember. Straight ethylene glycol is very corrosive and within 1-2 years of
first use in automobile cooling, they had to add the extra stuff to keep it
from eating everything up. It's untelling what they were using where you were
at. A read of the early patents tells the tale on it.
Will
*********** REPLY SEPARATOR ***********
On 3/5/05 at 8:48 PM Harold B. Mandel wrote:
>I had an opportunity to work with ethylene glycol industrial
>coolant while up in New Hampshire, and everything was dandy
>until the system leaked.
>
>What I didn't know about industrial ethylene glycol was that it
>physically burns human skin even though it might not be
>at a hot temperature.
>
>We ran a 100 percent glycol system up on top of a mountain
>in NH and needed to do so in case there was a catastrophic
>power outage and access was denied because of weather
>conditions (and everything naturally froze solid).
>
>We used an accumulator with a spring diaphragm to maintain
>even pressure (along with a pressure regulator valve) and after
>one particularly nasty season the system was found to be leaking
>at the plastic-to-metal pipe junction, so the coolant had to be
>drained in order to effect repairs, and a couple of us got our
>hands and arms soaked, and with no plumbing facilities at the
>tower site we walked around for hours having just toweled the
>coolant off, and later suffered what looked to be like second-
>degree chemical burns up and down our arms.
>
>For those of us not trained by a seasoned hand in ethylene glycol
>cooling system safety I would recommend sticking with distilled
>water if you don't have to worry about frozen plumbing.
>
>Respectfully,
>
>Hal Mandel
>W4HBM
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