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, such as 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!