Uniheat 72 Hour Heatpack

72-Hour UniHeat Heat Packs are designed for long-duration shipments and activate slowly, taking up to 3 hours to begin warming. They produce a steady heat output comparable to 40-hour heat packs and typically reach peak temperature within 24 hours. These shipping warmers are ideal for second- and third-day transit, helping protect live animals from cold stress during extended shipping times.

USING THE HEAT PACK

1. The purpose of using a heat pack during the shipment of live animals is not to achieve an ideal internal box temperature, but rather to prevent temperatures from dropping too low, which can cause extreme stress or death.
2. If you need to test the heat pack before placing it in the box, remove it from the vacuum-sealed bag and wrap it in a layer of newspaper, or place it in a small enclosed space such as a lunch bag, shirt pocket, or pants pocket. Allow time for the heat pack to activate and warm up. Do not place the heat pack directly on a table, as the large surrounding air volume can dissipate the heat and make it difficult to feel during the initial activation stage.
3. Heat packs have two sides. The side with the red stripes contains small perforations and must always be exposed to air. Do not place this side flat against any surface or tape it in a way that blocks airflow, as proper oxygen exposure is required for the heat pack to function correctly.
4. In a one cubic foot insulated shipping box, one heat pack will typically raise the internal temperature by approximately 12–16°F. Each additional heat pack may increase the temperature by roughly 10°F. A temperature range of 60–75°F is generally safe for most reptiles and amphibians during shipment.
5. If the temperature inside the shipping box is allowed to fall below 32°F (freezing), the heat pack may stop working, as water—one of the heat pack’s key components—can freeze and halt the chemical reaction.