Plastasteel

Plastasteel is a self-molding material used by the UNSC to make objects shape into handgun grips. The material is also used to make the shells of cryo-chambers.

Trivia
Although it is not directly called plastasteel, the material that makes up some chairs in Halo: The Fall of Reach is described very similarly, and shifts to fit the shape of the user's body.

List of appearances

 * Halo: Combat Evolved
 * Halo: First Strike
 * Halo: Combat Evolved Anniversary