Kathor

Kathor was a substance used in starship manufacture. A kathor–Duranium composite was used to make the majority of the hull plating on Helix-class light interceptors, which were vessels designed and made by starship manufacturer Arakyd Industries. The plating was capable of withstanding seventy–five Gs without alluvial dampening affects.

Behind the scenes
Kathor was first mentioned in 1995 in the article "A Buyer's Guide to Alternative Starships" which was published in the fifth issue of the Star Wars Adventure Journal series of supplement books for West End Games, Star Wars: The Roleplaying Game. The article was written by Stephen Luminati.