American Scientific Heat Packs
Reusable and portable pack to produce instant heat.
Supplier: American Scientific 322703
- Contains super saturated solution of water and sodium acetate
- Chain reaction created by snapping metal disc crystallize solution which gives off heat
- Recharged back to liquid state from crystallized state by boiling in water for 10-15 minutes
- Includes teacherapostrophes guide
- Available in two sizes: 4 x 4 in. and 8 x 8 in.
|Heat Pack (20.3 x 20.3cm (8 x 8 in.))|
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