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Polar is a powered, single middeck locker equivalent size, -95°C freezer developed by EITD for NASA Crew and Thermal Systems Division (CTSD).  Polar is capable of operating within SpaceX's Dragon Capsule, the Cygnus Pressurized Cargo Module, and the International Space Station (ISS) EXpedite the Processing of Experiments for the Space Station (EXPRESS) Rack.
The main function of Polar is to provide -95°C freezing capability and storage for a broad range of science samples during transportation to and from the ISS and while aboard the ISS. Polar accommodates samples of various dimensions and shapes to meet investigator science goals, increasing NASA’s ability to satisfy the demand for future science experiments conducted aboard the ISS.
The first flight of Polar was the SpaceX Dragon mission CRS-5. It has since become a frequent flier on the unmanned flights to and from the ISS, having as many as seven units on board an individual launch or return flight. It has also been a part of all of the Crew Dragon missions since Demo-2.


Imperial (in)

Metric (cm)

Strict Internal Dimmension 6.2 x 8.3 x 13.0 15.8 x 21.0 x 33.1
Total Internal Dimmension 6.5 x 8.8 x 13.6 16.6 x 22.5 x 34.6



Imperial (in3)

Metric (L)

Strict Internal Volume 670.74 10.99
Total Internal Volume 776.52 12.72





Celcius 4° to -95° 1° Celcius
Fahrenheit 39.2° to -139°