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Reusable ice packs back12/11/2023 ![]() ![]() ![]() 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. ![]() Additives to improve the properties of water are often used. 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. Ice initially well below freezing temperature will last a little longer. The amount of ice needed varies with the amount of food, its initial temperature, the thermal insulation of the cooler, and the ambient temperature and exposure to direct sunlight. Ice packs are used in coolers to keep perishable foods (especially meats, dairy products, eggs, etc.) below the 5–75 ☌ (41–167 ☏) danger zone when outside a refrigerator or freezer, and to keep drinks pleasantly cool. Both ice and other non-toxic refrigerants (mostly water) can absorb a considerable amount of heat before they warm above 0 ☌ (32 ☏).` To be prepared for use, the pack is first placed in a freezer. The instant type is generally limited to medical use as a cold 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 portable coolers or in insulated shipping containers to keep products cool during transport. They can be divided into the reusable type, which works as a thermal mass and requires freezing, or the instant type, which cools itself down using chemicals but can only be used once. An ice pack Shipment of vaccine in insulated box with gel packsĪn ice pack or gel pack is a portable bag filled with water, refrigerant gel, or liquid, meant to provide cooling. ![]()
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