Do Gundams use a special kind of armor?
That depends on the world in question. In the original Mobile Suit Gundam, the prototype RX-78 Gundam was armored with a special alloy known as Luna Titanium, which was subsequently renamed Gundarium in honor of this famous machine. However, this Gundarium alloy was then used by a wide variety of mobile suits, while some later Gundam models employed different armor materials. As a result, in the Universal Century world, there’s no real connection between the Gundam mobile suits and Gundarium alloy.
