Pvc ice packs

Tonya Harding

Super Active Member
Gold Supporting Member
Jun 15, 2018
Cool the cooler before you use it, I use a towel/towels to fill in empty space at the top; have a Yeti as well, but also have an RTIC, less $$$, does great, had a Pelican I gave to my nephew & wish I had it back...when I lived in coastal Carolina years ago, had a giant azz cooler we'd throw fish in w/ the food & drinks, got married & that was the end of that...I now have a dedicated food cooler/drink cooler...


Active Member
Nov 22, 2018
Sector 706, Planet Georgia
Putting on my tech writer hat for a moment…

I think frozen salt water gets things colder is because of the state change at lower temperatures. Ice absorbs heat, but it's when it starts melting (state change from solid to liquid) that it really absorbs heat. Brine's melt/freeze point is, IIRC, 0°F. So what's happening is, the state change (when the most heat is absorbed) begins at a lower temperature.

But yes, because it has a lower melting point, it will melt sooner than freshwater ice. Because it melts at colder temps, it should be great for pre-cooling coolers and refrigerators.


Mar 3, 2006
FARfetched, there is a temp range where salt water ice wins, that temp is too cold for me and neither I nor dog can drink or put the salt water in the radiator. Ice melt requiring more energy absorbed is what I desire.
We define a calorie as changing 1 gram of water 1 degree C, this gives us 80 calories/gram phase change and 1/2 calorie/gram for ice to change 1 degree C. Salt ice is less than 1/2 cal, less than 80 calories. (note slopes of red salt are steeper and phase change is 50 cal (-20C melt) vs 80 (0C melt).


so a little bit a salt and you are ~ the same as no salt, a lot of salt and you loose too much phase change energy!
Design what ya want and if ya need colder there is some other mix out there, or practice ice retention and use lots so ya can have a cool drink of water.
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Active Member
Jun 19, 2020
Has anyone made pvc ice packs. I am just wondering how effective they are for 3 or 4 days at a time. Size is a question as well. Diameter mostly. Thanks
i just made this ice box for my RTIC cooler:


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Dragonfly Lou

Mar 30, 2019
Oklahoma, USA
I made several with some spare pvc we had, some salt water some plain water. I have found that using my quart size club soda (plastic bottle) actually lasts a lot longer than the pvc ice bombs. If you put a bit of reflectex on top of everythings the bottles work even better.