Bioplast, Crab
SKU: 10-3800
Bioplast, Beetle
SKU: 10-3700
Heat Pack 8"x8"

Heat Pack 8"x8"

Product Code: 3227-03
Availability: Contact Us
Contact American Scientific To Order  

The 8"x8" (200x200mm) 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 in water for 10-15 minutes and allow it to slowly cool. Comes with a Teacher's Guide.

Teacher's Guide Coming Soon!
© 2015 American Scientific