This is one of the most important distinctions to understand:

DEWAR:

  • Stationary storage container
  • Maintains -196°C indefinitely
  • Requires periodic refilling (every 4-16 weeks)
  • NOT portable (heavy, difficult to move)
  • Best for: Long-term storage in fixed locations
  • Cost: £1,500-5,000 initial + £300-600/year operating

DRY SHIPPER:

  • Portable transport container
  • Maintains -196°C for 7-21 days only
  • Uses absorbed cryogen (no refills during transport)
  • Highly portable (one person can carry)
  • Best for: Transport between facilities
  • Cost: £200-800 initial + £1,500-2,400/year operating

Simple comparison:

  • Dewar = “Parking lot for samples” (stay long-term)
  • Dry shipper = “Taxi for samples” (travel short-term)