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From Halopedia, the Halo wiki

Plastasteel is a self-molding material used by the UNSC to make objects shape into handgun grips.[1] The material is also used to make the shells of cryo-chambers.[2]


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[edit]


  1. ^ Halo: First Strike, Chapter 14, page 133(2003 paperback); page 163(2010 paperback); ("Fred peered inside and saw a rack of handguns. They weren't the standard issue HE pistols; these had oversized barrels--easily 30 percent larger and longer--and they had grips of self-molding plastasteel.")
  2. ^ Halo: First Strike, Chapter 16, page 150(2003 paperback); page 185(2010 paperback); ("John brushed off the frost buildup that clouded the top half of the cryotube, and revealed the green-armored figure sprawled behind the plastasteel shell.")