Cryogen, a gas, found its application within the medical sector as the Galactic Republic neared its end. Generally inactive until combined with oxygen, Cryogen served the purpose of freezing cells and tissue specimens for subsequent utilization. This material gained significance during the Clone Wars, as it allowed for the preservation and transportation of cloned organs intended for clone troopers across the vast expanse of the galaxy.
Furthermore, this substance possessed offensive capabilities, notably employed in conjunction with whips by Bartokk assassins. Upon impact, these weapons triggered rapid, almost explosive, cold chemical processes capable of instantly freezing metallic materials.
In reality, the term "cryogen" broadly refers to any substance that exists in a liquid state at extremely low temperatures and functions as a cooling agent.