| Re: [GMCnet] Winterizing the GMC [message #105704] |
Thu, 11 November 2010 15:25  |
jayrabe
Messages: 509
Registered: June 2009
Location: Portland, OR
Karma:
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Senior Member |
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Hi Emory and everyone,
Don't want to get a reputation as a negative nelly, because I'm really a pretty happy and upbeat guy. But my training is in chemistry, and the first thing I do when evaluating a compound is look at the MSDS. There are lots available online, and they are completely science-based and not subject to political or financial persuasion.
MSDS rates health hazard of propylene glycol as 2=moderate. Not exactly non-toxic. Lethal ingested dose in humans is thought to be about 3-4oz.
(per JTBaker mfr: http://www.jtbaker.com/msds/englishhtml/E5125.htm.)
As always in such things, there is lots of controversy and differing opinion and not a lot of data about subtle effects of lower exposures, and the food industry has obviously persuaded the FDA that the risk can be managed to an innocuous level, but please folks, don't be thinking you can drink the stuff as being purely non-toxic, because it's not. And if you do use it in your fresh water system, please do a complete and thorough job of rinsing your system. It's completely soluble in water, so a good long flush will get it out, just beware of any dead-ends in your plumbing that might not be easily rinsed.
Really love my GMC and this list and have huge respect and
admiration for the experience and selfless spirit of sharing by everyone
on here. Hate to see someone get sick and maybe not even know why. PG is only effectively non-toxic when properly managed/diluted/rinsed.
J
76 PB
Portland, OR
> From: emerystora@mac.com
> Date: Thu, 11 Nov 2010 12:59:09 -0700
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Winterizing the GMC
>
>
> On Nov 11, 2010, at 12:06 PM, Jim Miller wrote:
>
> >
> > On Nov 11, 2010, at 1:30 PM, Emery Stora wrote:
> >
> >> It is likely that the growth didn't come from the propylene glycol but
> >> that it came from your tank and water lines.
> >
> > Hi Emery,
> >
> > I agree completely that the organism came from my water lines or tank
> > rather than the factory-virgin product. What surprised me was that the
> > glycol solution would support the growth of an organism that may be
> > common in domestic water lines.
> >
>
> Proplylene glycol is non-toxic. It is also has FDA approval and is commonly used as a food additive in many commercial foods. It is used as a humectant and stabilizer in many prepared fruits, vegetables and bakery goods, Also as a emulsifier in many prepared foodstuffs.
>
> Since it is non-toxic I am not at all surprised that an organism can easily grow in its solutions with water.
>
> Emery Stora
> 77 Kingsley
> Santa Fe, NM
>
>
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