AMERICAN Scientific, LLC
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Heat > HEAT PACKS

The hand warmer contains a super saturated solution of water and sodium acetate. Snapping the metal disc creates chain reaction causing the solution to crystallize. The crystallization process gives off heat. The heat packs can be recharged back to the liquid state by boiling water for 10-15 minutes and allow it to slowly cool. Comes with Teachers Guide Two Size: 4"x4" and 8"x8"

Larger View

Please log in for prices and orders. Product # Product Qty Price 3227-02 Larger View HEAT PACK 4x4 Comes with Teachers Guide Size: 4"x4" 3227-03 Larger View HEAT PACK 8x8 Comes with Teachers Guide Size: 8"x8"