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Frey Scientific Reusable Heat Pack, 4 x 4 Inches

Item #: 1392320

$13.89
$10.42

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In Stock - Typically Ships Within 2-3 Days

Need to demonstrate how to create heat? These compact 4x4 inch heat packs are reusable making them a convenient and economical choice.

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About This Item

Description

The heat pack contains a super saturated solution of water and sodium acetate. Snapping the metal disc creates a chain reaction causing the solution to supercool and crystallize. Because sodium acetate "freezes" at 130 degrees Fahrenheit, the process actually creates what we consider heat. The heat packs can be recharged back to the liquid state by boiling water for 10-15 minutes, making sure all crystals disappear, and allowed to slowly cool. Packs measure 4 x 4 inches.