Impervium was an almost impenetrable alloy known to have been used to coat the hulls of starships.
It was notably used on the hull of Soulless One—the personal starfighter of General Grievous.
Impervium was later used in the molecular furnaces of the World Devastators constructed by the resurgent Galactic Empire under the reborn Palpatine.
Plastoid was the material used in the armor of clone troopers, and later in the Imperial Stormtrooper Corps. Some of the structures in Mos Eisley on Tatooine were made from this material.
It was also used to produce sturdy chairs. One place where such chairs were found was on the Galactic Alliance ship Admiral Ackbar.
edit Behind the scenes
Plastoid's appearance is very similar to real-life plastic, although much sturdier.
