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Product Number: SB47058

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Contains a super saturated solution of water and sodium acetate. Snapping the metal disc creates a chain reaction, causing the solution to crystallize. The crystallization process gives off heat. Packs can be recharged back to the liquid state by immersing in boiling water for 10-15 minutes and allow it to slowly cool. Includes teacher’s guide. 4 in. x 4 in. Grades K-12.

Brand  :       American Scientific
Item Weight  :       0.44
Manufacturer Part Number  :       3227-02
Prop 65  :      


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