ARCTIC ICE Tundra Series has a very unique freezing point of 5F and is designed to help maintain a consistent freezer temperature in coolers. While not as cold as dry ice, ARCTIC 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, ARCTIC ICE Tundra Series can take from 18-36 hours to freeze, depending on the temperature of freezer and number of panels being frozen. To ensure ARCTIC ICE Tundra Series panels are frozen, the freezer should be turned to its lowest setting or at least 0F. It is recommended that ARCTIC ICE 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, reusable results. Store panels in freezer so they are ready when needed. ARCTIC ICE Tundra Series panels are also top rack dishwasher safe! ARCTIC ICE uses non-toxic, high performance phase change materials, or PCMs, to keep cooler temperatures anywhere from ice cold to frozen. Each panel is ruggedly designed with expanded surface area to provide exceptional cooling capacity and efficiency. Spin welded seals keep our panels leak free for a lifetime of use. ARCTIC ICE products are warrantied against defects from workmanship for life.