Gell Paks

[AbbyNormal]

there seem to be a lot of gells most likely mixtures of propylene glycol and water that freeze at temperatures below 32 degrees F, so you have a colder temperature source than regular ice, plus some latent heat capacity.

Out of curiosity, are there commercially available gells that would change state (thaw) somewhere from 34 to 40F with a decent latent heat?

Take the "V" out of HVAC and you are left with a HAC(k) job.

 

[unclesyd]

Though not exactly a Gel pack by definition here is a product Techni Ice that maybe what you are looking for.
Look down the page to paragraph 9 & 10.

Some other Gel packs are listed as being for cold/hot usage.

http://www.techniice.com/english/instruction.htm

 

[AbbyNormal]

i think acetic acid is what I am after

Take the "V" out of HVAC and you are left with a HAC(k) job.

 

[unclesyd]

Are you sure it's acetic acid and not an acetate?