Glycerol versus Glycol

hr

a glyceril based product? We used glycerin as ab antifreeze in PVC fire sprinkler systems.

I don't recall it having much of an inhibitor product. And it id VERY thick when cold. We used gear pumps to inject it into the system when cold.

Unbelievably messy stuff, too.

If the price is lower I suspect something is missing from the mix. Typically the low priced stuff has a lower protection rate and a weak inhibitor package.

Think I would stay with the proven product, knowing what a hassle it is to drain down and replace compromised components. The savings goes away quickly!

hot rod

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Brad White_9

Glycerol versus Glycol

Has anyone heard of or used Glycerol instead of glycol? We have a contractor substitution on this. Glycol is running $480 a drum and the glycerol about $420. Wondering how effective it is, thoughts on leakage (really now!) and compatability with Rectorseal #5. Any thoughts welcome.

Thanks!

Brad

Weezbo

some glycol is having heating or cooling uses

and has various inhibitors as HR said. the reason some glycol is less expensive is because it just isn't in there:) some manufacturers have chemical additives to brighten up the brand that they sell. and you would never know unless you asked. from what i understand cases of these additive have gathered dust for years on the bulk plants shelves... once the boilers are going people generally tend to only have any interest in the boiler if the contractor or some tech shows up on a no heat....

back in the 70's i considered buying drums and fixing every car in the neighbourhood with glycerin ...seems one spoonful of glycerin in the transmission and rear (pumpkin)axle allows the gears to function in severs cold.

the temp ratings for it tops out around 870 from what i remember before it can flash fire. so, i have also tested it in the break fluid under 30 below.....the thing that indicates is some fluids that look like honey at room temp, flow under heat really well.

Drew_2

Glycerin/glycerine

Hot Rod is correct. Glycerin will not work in a boiler system for many reasons.
You will need 50% glycerin to achive the same freeze temp. as 35% propylene glycol.
If you want me to go through the reason list, I will.

Brad White_9

Drew- I figured you would know.

Yes, if you do not mind. I will e-mail you off-line unless the reasons are too good not to share!

Brad