1.become gel quickly after fill in water. 2. It is clean, nontoxic 3. CE, SGS, MSDS, ... opening cans airproof by itself. After adding water, the polymer in bag will quickly absorb water and became gel. The gel ... . UsageTo be added water into the bag, and then sharked, in order to make the full contents mixed.Use it after ... /T4. OEM is available5. Certificate: CE, SGS, MSDS, ROHS, etc. super ice pack