How Long Does It Stay Cold? The 48-Hour Cold Chain in Passive Shipping Explained
It is the question that comes up before almost every switch: how long does my product actually stay cold? It is a fair one, because the answer decides whether a shipment arrives as promised. The short answer for our packaging is: more than 48 hours. The longer answer explains why that number is not a fixed value, but the result of several conditions.
Passive cold-chain shipping in brief
Passive cold-chain shipping means that no technology and no power holds the temperature, but the packaging itself. An insulating shell slows the heat exchange with the surroundings, and a coolant inside releases cold. Together they hold a constant climate inside the packaging without anyone having to intervene on the way. That is exactly what makes this method so practical and economical for shipping.
What really determines the 48 hours
Cooling duration is not a catalogue value, it depends on four factors. The insulation performance of the packaging, meaning how well it holds the temperature. The amount and preparation of the coolant. The starting temperature of the goods before they are packed. And the conditions of the route, meaning duration and outside temperature. Change one of these factors and the result shifts. That is why we never design packaging in a blanket way, but for your specific load profile.
Why the right design matters more than the number alone
Packaging that promises 48 hours on the data sheet but does not match the product and route will not keep that promise in operation. Conversely, a solution designed to fit gives you exactly the certainty you need, without having to overcompensate just to be safe. Our packaging keeps your goods reliably frozen or chilled for more than 48 hours, because we match insulation, coolant and size to your use case.
Sustainable and high-performing at once
This cooling performance is achieved without polystyrene. Our packaging is made from more than 97 percent recycled paper, the insulation is cellulose based, and everything can be disposed of entirely in the paper stream. Reliable cooling over 48 hours and genuine circularity are not opposites.
Want to know how long your product stays cold in your specific case? We will work it out for you. Get in touch: https://www.supaso.eu/kontakt