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Structure of polystyrene

Styrofoam is the trademark name for polystyrene thermal insulation material, originally manufactured on Earth by the Dow Chemical Company. The word "styrofoam" is sometimes improperly used by the general public as a generic term to indicate polystyrene foam, which is made from expanded polystyrene beads.

Humans use styrofoam (the improper usage mentioned above) to make coffee cups and other related items.[1]


  1. Halo: First Strike, page 242