Frey Scientific Reusable Heat Pack, 4 x 4 Inches
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- If the pricing program minimum subtotal is met item Ships Free with your Pricing Program. Free shipping calculation is based on the subtotals of eligible items on your pricing program, after any additional discounts are applied.
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- Shipping and handling charges are 20% of the subtotal of the items, after any discounts are applied, with a $11.95 minimum charge.
Free Shipping Ineligible
- Shipping and handling charges are 20% of the subtotal of the items, after any discounts are applied, with a $99 minimum charge. If the subtotal is greater than $1,000, please call 1-877-350-0645 or E-mail freight_quote@schoolspecialty.com for a freight quote
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Items Shipped to Hawaii, Alaska and International
See our Hawaii & Alaska Shipping Policy and International Shipping Policy for details.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.Features
- Shows how sodium acetate uses the process of supercooling to create heat
- Great for everything from muscle aches to scientific demonstrations
- Combines practical applications with a process that's fun to watch!
- 1 Heat Pack
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