Specific Gravity of Boiler Antifreeze

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1975gt750
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Post Wed. Jan. 29, 2014 10:49 pm

Can you use an automotive hydrometer to check specific gravity of boiler antifreeze?
what should the specific gravity be for a in house boiler be?

Thanks chris

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mozz
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Post Thu. Jan. 30, 2014 7:26 am

Different types of auto antifreeze have different specific gravity, so you use a tool calibrated with both scales. I just bought a refractometer on Amazon and would never use the floating ball type again. I'm sure boiler antifreeze specific gravity can be found and a automotive tool can be used to get you in the ball park. You can buy tests strips to test your boiler antifreeze, they shouldn't cost too much.
Last edited by mozz on Thu. Jan. 30, 2014 7:34 am, edited 1 time in total.
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VigIIPeaBurner
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Post Thu. Jan. 30, 2014 7:33 am

The automotive antifreeze gauge is calibrated for ethylene glycol. Most likely you'll be using propylene glycol in your boiler. It would get you close but it would not be accurate. Commercial antifreeze lens usually have an inhibitor package in them that could slightly affect the specific gravity of the solution.

Go on the Internet and look for charts that would give you the specific gravity, freezing point, boiling point, specific gravity's of solutions for both propylene ethylene glycol. Then you just have to convert from the automotive antifreeze gauge reading to propylene glycol.

Here's two links to start . . .
propylene glycol

ethylene glycol
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mozz
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Post Thu. Jan. 30, 2014 7:36 am

Refractometers are calibrated in both scales, that's why I mentioned it.
Gouldsboro PA.

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Post Thu. Jan. 30, 2014 9:34 pm

mozz wrote:Refractometers are calibrated in both scales, that's why I mentioned it.
Yes, indeed there are instruments that are. Refractometers come calibrated to many scales, even an arbitrary scale like the one I use. And it's probably just what he really should get. His original post was could he use an automotive style to check the %PG in his boiler loop.
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