<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>My brother in law is a chemist - in his experience in industrial
chemistry, they used ethylene glycol and propylene glycol
interchangeably as solvents, based on what was available and
cheap.</p>
<p>[Note: He was NOT involved in food-grade chemicals, he works with
fire retardants!]</p>
<p>Propylene glycol is roughly 1/3 as toxic (as measured by LD50
with rats) as ethylene glycol. By most standards, even ethylene
glycol is not very toxic, but it's a hazard because the sweet
taste can lead animals (and humans, in my personal experience) to
consume the stuff. Given that they are both used as specialized
industrial solvents, it's not surprising that these compounds can
do funny things to rubber radiator hoses. I don't doubt that part
of the testing of materials for radiator hoses includes resistance
to all commonly used antifreeze compounds. <br>
</p>
<p>A bit of agriculture: Back in the day before it was banned, we
discovered the hard way that the herbicide Lasso (common name
alachlor) did nasty things to some types of hoses. We had to
change out all the hoses on a spray rig at least once before we
figured it out.<br>
</p>
<p>Mark J<br>
</p>
<div class="moz-cite-prefix">On 2/17/2019 6:53 PM, David Myers
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1064579955.776418.1550451202831@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div class="ydpb53f5c5cyahoo-style-wrap"
style="font-family:Helvetica Neue, Helvetica, Arial,
sans-serif;font-size:13px;"> </div>
<div class="ydpb53f5c5cyahoo-style-wrap"
style="font-family:Helvetica Neue, Helvetica, Arial,
sans-serif;font-size:13px;">In my experience both types are good
coolants. My only caution is do not mix the two! They are not
compatible. </div>
<div class="ydpb53f5c5cyahoo-style-wrap"
style="font-family:Helvetica Neue, Helvetica, Arial,
sans-serif;font-size:13px;">You do not have to do anything
special to change types other than drain and refill although
flushing with plain water sure won't hurt and isn't a bad idea.
I wasn't aware that propylene glycol is less toxic, that is a
definite plus.</div>
<div class="ydpb53f5c5cyahoo-style-wrap"
style="font-family:Helvetica Neue, Helvetica, Arial,
sans-serif;font-size:13px;">David</div>
<div class="ydpb53f5c5cyahoo-style-wrap"
style="font-family:Helvetica Neue, Helvetica, Arial,
sans-serif;font-size:13px;"> </div>
<div class="yahoo_quoted" id="yahoo_quoted_1201248835">
<div style="font-family:'Helvetica Neue', Helvetica, Arial,
sans-serif;font-size:13px;color:#26282a;">
<div> On Sunday, February 17, 2019 05:45:34 PM
EST, Jason <a class="moz-txt-link-rfc2396E" href="mailto:dejoodster@gmail.com"><dejoodster@gmail.com></a> wrote: </div>
<div><br>
</div>
<div><br>
</div>
<div>
<div id="yiv0285361878">
<div>
<div><br clear="none">
<br clear="none">
<div class="yiv0285361878gmail_quote">
<div class="yiv0285361878gmail_attr" dir="ltr">Amsoil
also makes a propylene glycol antifreeze. Its heat
transfer abilities are better than ethylene. </div>
<div class="yiv0285361878gmail_attr" dir="ltr"><br
clear="none">
</div>
<div class="yiv0285361878gmail_attr" dir="ltr">Good
in high temps but not so great in the winter
because at idle the heater output at idle was
nearly non existent. </div>
<div class="yiv0285361878gmail_attr" dir="ltr"><br
clear="none">
</div>
<div class="yiv0285361878gmail_attr" dir="ltr">Jason </div>
</div>
</div>
</div>
</div>
<div class="yqt1742705676" id="yqtfd58485">_______________________________________________<br
clear="none">
AT mailing list<br clear="none">
<a href="mailto:AT@lists.antique-tractor.com" shape="rect"
ymailto="mailto:AT@lists.antique-tractor.com"
moz-do-not-send="true">AT@lists.antique-tractor.com</a><br
clear="none">
<a
href="http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com"
target="_blank" shape="rect" moz-do-not-send="true">http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com</a><br
clear="none">
</div>
</div>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
AT mailing list
<a class="moz-txt-link-abbreviated" href="mailto:AT@lists.antique-tractor.com">AT@lists.antique-tractor.com</a>
<a class="moz-txt-link-freetext" href="http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com">http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com</a>
</pre>
</blockquote>
</body>
</html>