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I assume you mean the chemical cold packs that you twist and shake which become cold immediately. Those cannot be reused since breaking the liquid vial and shaking mixes two chemical ingredients and result in an irreversible chemical reaction. The chemical cold packs uses the endothermic reaction of ammonium nitrate and water to cool down quickly. When one breaks a tube inside the pack the ammonium nitrate is released allowing it to mix with the water.

Technically the reaction can be reversed by dehydrating the ammonium nitrate, however it is generally not feasible to do so, hence there are no "reusable" cold packs.

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16y ago

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