How Do Body Comfort Heat Packs Work

Do not place in the freezer.
How do body comfort heat packs work. It turns out that sodium acetate is very good at supercooling. Apply to desired area of your body. A heat pack like the one you are describing contains sodium acetate and water.
All body comfort click and heat packs will maintain appropriate heat for therapeutic or doctor recommended timing usually 15 20 minutes per use. Massage the pack for a few seconds to make it soft and pliable. As your body draws heat from the heat pack the temperature will decrease gradually.
In this condition if you tap the glass the temperature of the water will jump up to 32 degrees f 0 degrees c and the water will solidify quickly. The liquid will begin to crystallize and heat up.