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glycerin vs water ratio in a typical filled pressure gauge 1

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USAeng

USAeng

Mechanical
Jun 6, 2010
419
Odd question that I can't seem to find on Google.

Does anyone happen to know what percent Glycerin vs Water is in a typical liquid filled pressure gauge? I see that freezing point is best at about 2/3 glycerin so is this typical ratio?

 
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It should be pure glycerin, as any water will promote corrosion. I had some old gages that were new in the box where the aluminum indicator needles dissolved.
 
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Good to know. Thanks for the info!
 
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