Arctic Ice™ Tundra Series has a very unique freezing point of 5°F and is designed to help maintain a consistent freezer temperature in coolers. While not as cold as dry ice, Tundra Series™ can be used as a suitable replacement – it has been shown to maintain frozen temperatures for days in controlled testing. Due to its low freezing point, Tundra Series™ can take from 18-36 hours to freeze, depending on the temperature of freezer and number of panels being frozen. To ensure Tundra Series™ panels are frozen, the freezer should be turned to its lowest setting or at least 0°F. It is recommended that Tundra Series™ be used to maintain frozen goods, i.e. ice cream, meats, fish, etc. Use weight equivalent to dry ice normally used for great, re-usable results. Store panels in freezer so they are ready when needed. Tundra Series panels are also top rack dishwasher safe!