Our Helios heating pads have sodium acetate and water. Sodium acetate "freezes" at 130 degrees F. Clicking the disk makes a few molecules change to a solid. The temperature of the solidifying liquid jumps up to 130 degrees F in the process. When solid pad is boiled, it is forced back to the liquid state. Every crystal must be completely melted or the liquid will quickly re-solidify. You can repeat this cycle forever, theoretically, just as you can freeze and melt water as many times as you like. Since sodium acetate is a food additive, similar to salt, it is non-toxic.
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ALL HELIOS HEAT PADS SHIP WITHIN 2 DAYS WITH 2-3 DAY SHIPPING
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