Anice pack, orcold pack (or, in specific cases,gel pack), is a portable bag filled with water or another liquid, or refrigerantgel, meant to provide cooling. They can be divided into the reusable type, which works as athermal mass and requires freezing, or the instant type, which cools itself down using chemicals but can only be used once. The instant type is generally limited to medical use as acold compress to alleviate the pain of minor injuries, while the reusable type is both used as a cold compress and to keep food cool in portablecoolers or ininsulated shipping containers to keep products cool during transport.[1]
To be prepared for use, the pack is first placed in a freezer. Bothice and other non-toxicrefrigerants can absorb a considerable amount of heat before they warm above theirmelting point.
Ice packs are used in coolers to keep perishable foods (especially meats, dairy products, eggs, etc.) below the 5–75 °C (41–167 °F)danger zone when outside a refrigerator or freezer, and to keep drinks pleasantly cool. The amount of ice needed varies with the amount of food, its initial temperature, thethermal insulation of the cooler, and the ambient temperature and exposure to direct sunlight. Ice initially well below freezing temperature will last a little longer.
Water has a much higher latent heat of fusion than most substances, and a melting temperature which is convenient and easily attained with, for example, a household freezer. Additives to improve the properties of water are often used. For example, substances can be added to prevent bacterial growth in the pack, or to prevent the water from solidifying so it remains a thick gel throughout use.
Gel packs are often made of non-toxic materials that will remain a slow-flowing gel, and therefore will not spill easily or cause contamination if the container breaks. Gel packs may be made by addinghydroxyethyl cellulose,[2]sodium polyacrylate,superabsorbent polymer or vinyl-coatedsilica gel.
Hot-or-cold packs are ice packs that are rated for high temperature use. They can be used as a normal reusable ice pack by storing in a freezer, but they can also be heated in water or a microwave oven to reach the desired temperature. The first hot and cold pack was introduced in 1948 with the nameHot-R-Cold-Pak and could be chilled in a refrigerator or heated in hot water.[3] The first reusable hot cold pack that could be heated in boiling water or amicrowave oven was first patented[4] in 1973.
Aninstant cold pack is a single-use device that consists of two bags: one containing water, inside another one containingammonium nitrate,calcium ammonium nitrate orurea. When the inner bag of water is broken by squeezing the package, it dissolves the solid in anendothermic process. This process absorbs heat from the surroundings, quickly lowering the pack's temperature.[5]
Instant cold packs are a convenient replacement for crushed ice used asfirst aid onsport injuries orheat illness, and can be carried as first aid to remote or wilderness areas where ice is unavailable. However, they do not provide as much or as long-lasting cooling as ice.[6]
Gel packs have been made withdiethylene glycol andethylene glycol. Both can cause illness if ingested in large amounts,[7] making them unsuitable for use with food. The USConsumer Product Safety Commissionrecalled such packs.[7]
