From Wookieepedia, the Star Wars wiki.

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.

Behind the scenes

Plastoid's appearance is very similar to real-life plastic, although much sturdier.

Appearances

• Jedi Apprentice: The Defenders of the Dead
• Jedi Apprentice: The Uncertain Path
• Jedi Apprentice: The Deadly Hunter
• Jedi Apprentice: The Evil Experiment
• Jedi Apprentice: The Ties That Bind
• Jedi Apprentice: The Call to Vengeance
• Episode I Adventures 1: Search for the Lost Jedi
• Jedi Quest: The Trail of the Jedi
• Jedi Quest: The Dangerous Games
• Jedi Quest: The School of Fear
• Jedi Quest: The Shadow Trap
• Jedi Quest: The False Peace
• Jedi Quest: The Final Showdown
• Republic Commando: Hard Contact
• Republic Commando: Triple Zero
• Republic Commando: True Colors
• MedStar I: Battle Surgeons
• MedStar II: Jedi Healer
• Labyrinth of Evil
• Order 66: A Republic Commando Novel
• Imperial Commando: 501st
• The Last of the Jedi: Dark Warning
• The Last of the Jedi: A Tangled Web
• The Last of the Jedi: Return of the Dark Side
• "A Two-Edged Sword" - Star Wars Insider 85
• Death Star
• Star Wars Episode IV: A New Hope novelization (First appearance)
• X-wing: The Bacta War
• A Forest Apart
• Tatooine Ghost
• Tempest
• Sacrifice

Sources

• Star Wars Customizable Card Game – Premiere Limited (Card: Plastoid Armor)
•  Clone SCUBA trooper in the Databank
•  Visual Guide Chapter 4: Artoo's Mission, Image 23 on StarWars.com (backup link on Archive.org)
• Star Wars: The Complete Visual Dictionary