Frozen
In shipping, frozen describes a requirement to transport goods in a frozen state. The temperatures to be maintained must be specified for the product. A range such as −15 to −25 °C is a specific requirement; it cannot be inferred from the word frozen alone.
Why is a frozen state alone insufficient?
- A product may still be frozen while already outside its approved temperature conditions.
- Permitted lower limits also matter. A significantly colder cooling medium is not automatically more suitable.
- The temperature range, shipping duration and conditions during transfer to subsequent storage must be compatible.
Which cooling medium may be suitable?
For suitable applications, frozen coolant packs with a negative PCM melting point can be used. Other requirements may call for dry ice or other systems. The choice is tested within the complete packout. Deep frozen often refers to even lower-temperature applications, but is likewise only unambiguous with a specific product specification.
Related terms: Deep Frozen · Product Stability
Technical references:
WHO: Storage and transport of temperature-sensitive pharmaceutical products