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American Scientific Heat Packs



Reusable and portable pack to produce instant heat.
Supplier: American Scientific 322702
Description
- 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.
Specifications
Heat Pack (10.1 x 10.1cm (4 x 4 in.)) | |
Teacher's guide |
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