The refrigerant is designed to protect your product from freezing or over-heating even in extreme conditions. Gel filling is nontoxic, nonhazardous and biodegradable; won't contaminate samples. Reusable packs freeze solid in 6 to 10 hours and remain at constant temperature for up to 72 hours. Place packs in the freezer for 24 hours before use.
Gel changes phase (freeze to thaw) at 0° C (32°F)
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