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What is in instant cold packs?

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Ammonium Nitrate and water.
Urea + plus a Non-Toxic Cooling Additive and Water providing a safer alternative to the dangerous Ammonium Nitrate

*Ammonium Nitrate is highly dangerous and used as an oxidizing agent in explosives.
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What are cold packs?

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In short yes they do expire. The timing varies depending on the manufacturer. If the pack appears yellow in color most likely it will not work to its original standards. It

Can you carry instant ice packs on airplanes in carry on?

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Where is the Expiration date on instant hot packs?

It varies based on the manufacturer and what chemicals are inside the bag. Most times they are either imprinted with ink or along the top and bottom seams.