[AT] antifreeze toxicity was OT - oil stop leak

[Mark Johnson]

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.

[Note: He was NOT involved in food-grade chemicals, he works with fire 
retardants!]

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.

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.

Mark J

On 2/17/2019 6:53 PM, David Myers wrote:
> In my experience both types are good coolants.  My only caution is do 
> not mix the two!  They are not compatible.
> 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.
> David
> On ‎Sunday‎, ‎February‎ ‎17‎, ‎2019‎ ‎05‎:‎45‎:‎34‎ ‎PM‎ ‎EST, Jason 
> <dejoodster at gmail.com> wrote:
>
>
>
>
> Amsoil also makes a propylene glycol antifreeze. Its heat transfer 
> abilities are better than ethylene.
>
> Good in high temps but not so great in the winter because at idle the 
> heater output at idle was nearly non existent.
>
> Jason
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