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Potassium formate as sub zero coolant

post #1 of 2
Thread Starter 
Hi, I decided to abandon the freezer project and attempt a chillbox build. One of my concern is that at low temp around -30C, glycol water mixture can become quite viscous. I've been looking around the web for a suitable alternative and stumbled upon potassium formate as coolant.

So far:
  • This stuff is expensive. No where near the Fluorinert level, but around 200$ per gallon with some additives like corrosion buffers etc.
  • My chemistry isn't good, but being a brine solution I imagine it's quite corrosive.
  • It's non-toxic and probably isn't going to damage acrylic like ethanol.
  • It's freezing point is around -40C with room temp viscosity of 2.2MPas. Couldn't find any data regarding viscosity at the lower temperature, but should be less than that of glycol solution.

I was wondering if anyone here have any experience with it.
post #2 of 2
If going all out sub -25c to -50c then 70/30 methanol/prestone deicer. If operating ambient to -25c then just prestone deicer.

Also read the MSDS ( Material Safety Data Sheet ), for any chemical you want to use, so that you can use it safely and know what to do in an event of an accident.
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