I need to ship frozen food using dry ice. Shipping should take about 48 hours. Will it stay frozen?!

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The US DOT, and the International Air Transportation Administration regulate the shipments of dry ice because it is listed as a hazardous material. So as a result special procedures must be followed when packaging and shipping items with dry ice. Here is a website that will aid you in that information.

http://www.unh.edu/ehs/pdf/Guide-to-Ship…

SHIPPING REFRIGERATED OR FROZEN ITEMS

From frozen lasagna to chocolates. From human tissue to prescription drugs - more and more goods are shipped refrigerated or frozen.First, the most important item is a good insulated container. An inexpensive styrofoam cooler from the grocery store will rarely work. It breaks easily and usually is not the right shape for shipping. A thick poly styrene box like Omaha Steaks uses or one from ThermoSafe, or the newest box from Control Temp Packaging will reduce the amount of dry ice needed and allow extended shipping times. Next is the shipping temperature. Use Dry Ice for shipping FROZEN goods as Dry Ice will freeze everything in the shipping box. Use "gel packs" or "blue ice" for goods to be REFRIGERATED. A combination of dry ice and gel packs will extend the shipping time by several days if the shipped items can be frozen for a short time or thawed for a short time. For Dry Ice plan on using 5 to 10 pounds for each 24-hour period depending upon the quality of the insulated shipping container. This will keep everything frozen in a container up to 15 quarts. For larger containers and greater shipping times multiply dry ice quantities by this rate. The best shipping container is a two-inch thick urethane insulated box tested to lose only 5 pounds for a 10-quart storage volume every 24-hours. Newer materials developed for Control Temp Packaging in Norcross, GA have tested nearly the same as urethane. Less thick or efficient insulation will need more Dry Ice because it will sublime faster. For gel packs, as a generality use one pound per cubic foot per day. (Most gel packs come in 1/2 pound size but newer ones are up to 2 pounds.) This will be last for up to three days. For a longer time Dry Ice has to be combined to extend the gel packs with the possibility of freezing the goods briefly in the beginning. When packing items in the container put dry ice any gel packs and the product as close together as possible with the dry ice on top. Fill any empty space with wadded newspaper, Styrofoam peanuts, or the latest bubble packs, as any "dead-air-space" will cause the Dry Ice to sublimate faster. Dry Ice sublimation (changing from a solid to a gas) will vary depending on the outside temperature, air pressure (on an airplane with lower air pressure it will sublimate faster) and efficiency of the insulation. The more Dry Ice you have stored in the container, the longer it will last. Dry Ice, at -109.3°F or -78.5°C, will freeze and keep frozen everything in the container until it is completely sublimated. These frozen items will still take some extra time to thaw because they will have been so cold.

Use dry ice and freezer packs also known as gel packs. Br=efore shipping be sure to follow federal labeling guidlines for shipping with dry ice.