What chemical is in gel ice packs?
It’s Sodium polyacrylate.
As a type of superabsorbent polymers, sodium polyacrylate can absorb plenty of water and become a gel form.
One-gram sodium polyacrylate can absorb 300-1000 grams of pure water. In other words, it’s enough to contain 1 gram (or less) sodium polyacrylate for each gel ice pack.
Advantages of Sodium polyacrylate
- high specific heat capacity;
- low cost (for each gel ice pack) ;
- non-toxic & environment friendly;
Is it safe?
Actually, sodium polyacrylate is also the main absorption material in common hygiene products such as paper diapers and sanitary towels.
So it is totally non-toxic, harmless and resoluble.
How to judge the quality
There are some mainly parameters index to help us judge the quality of this chemicals in ice packs:
- Absorption–How much the polymer can absorb.
- Absorbent rate—How fast the polymer absorbing liquid.
- Absorption under pressure and retention capacity after centrifugation–Make sure that gel locks the water well.
- Particle Size Distribution.
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