Once the metal disk in a
Wonder Warmer® is pressed, the liquid in the pad
crystallizes in a chemical reaction that is fascinating to
watch and generates heat for 30 minutes to over 2 hours
depending on the pad’s size, construction, and insulation,
and the temperature outside.
Activation
Crystallization and heating
Ready for use
The pad is “recharged” by
boiling it for approx. 5 - 12 minutes (i.e. Until all of the
crystals melt back into their original liquid state). If all
of the crystals are not melted, the pad will activate on its
own as it cools.
The activation and recharging
of a pad can be repeated a virtually unlimited number of
times, provided the pad's pouch is not damaged. Although the
pad will not work if the pouch is damaged, its contents pose
no threat as they are common non-toxic food additives.
