Put a cube of ice on a counter and it starts melting straight away. The same is true inside a shipping box: from the minute the lid closes, loose ice is turning into water.
Why gel lasts longer
An Ice Cold Gel Pack is water held in a polymer gel. The gel absorbs heat slowly and evenly, so the pack releases its cold gradually instead of all at once. In a well-insulated shipper, that means up to 36 hours of cold.
What affects your hold time
- Insulation: the thicker and better sealed the box, the longer the cold lasts.
- Pack size: more frozen gel absorbs more heat. Choose 10, 16, or 24 oz to match the box.
- Outside temperature: a summer route is a harder test than a winter one.
- Product temperature: pre-chill goods so the gel holds their temperature instead of pulling it down.
More cold time means more peace of mind. More science, fewer surprises.
