Yes. All CryoStork models operate without free liquid nitrogen during transit, which is the defining characteristic that makes them suitable for air freight of biological samples. Because the liquid nitrogen is retained within the inner absorption matrix rather than existing as a free liquid, CryoStork dry shippers travel as not restricted under IATA Special Provision A152, rather than under the dangerous goods restrictions that apply to liquid-phase nitrogen containers. Packing Instruction 650 is a separate requirement covering the biological samples inside where those are classified as UN 3373 Category B, not the nitrogen holding them cold.

What this means for air transport in practice

For air transport purposes, a correctly charged CryoStork dry shipper is classified as a non-hazardous consignment containing biological substances maintained in cryogenic vapour phase. The vessel itself does not trigger dangerous goods handling requirements, which means it can travel on commercial passenger and cargo flights without the specialist dangerous goods documentation and handling fees that apply to free-liquid nitrogen shipments.

The IATA classification is not a technicality to be managed around. It is the direct clinical and operational benefit of vapour-phase transport. The absence of free liquid nitrogen is what makes routine inter-clinic embryo and sperm transfers by air practically possible.

Documentation and temperature monitoring

All CryoStork models carry UKCA and CE markings, which supports the documentation requirements for biological sample transport on international routes. Optional temperature data loggers compatible with the CryoStork range provide a continuous record of internal conditions during transit, which is important for regulated materials and provides the chain-of-custody temperature evidence that receiving clinics and regulatory bodies may require.

Choosing the right model for international routes

For international transfers, matching the vessel size to the journey duration and potential delay scenarios is important. Longer routes with possible transit delays or customs hold periods require the additional hold time margin that the larger V6 or V10 models provide. For route-specific advice on model selection, contact Cryolab or view the full CryoStork range here.