Delta Education Reusable Heat Pack, 4 x 4 inches

Item #: 1392320
$7.99 $6.23

Free Shipping Eligible: Details

School Specialty Shipping Policy

Items Shipped Within the Contiguous 48 United States

Free Shipping Eligible Items

  • Free shipping and handling on eligible supply orders of $49 or more. Free shipping calculation is based on the subtotals of eligible items, after any additional discounts are applied.
  • For subtotals less than $49, the shipping and handling charge is $9.95.

Free Shipping Ineligible Items

  • Shipping and handling charges are 12% of the subtotal of the items, after any discounts are applied, with a $5 minimum charge.

Free Shipping Ineligible Items

  • Shipping and handling charges are 15% 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.

*Note: Individually negotiated shipping policies will override the standard shipping policy. See Full Details

In Stock - Typically Ships Within 2-3 Days
Add to Cart
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. 4 x 4 inches.
  • 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!
Includes:
  • 1 Heat Pack