Polycarbide

Polycarbide was a component of the dalekanium metal used in the construction of Dalek casings. According to the Tenth Doctor, it was the "skin" of a Dalek. (TV: Doomsday)

The Seventh Doctor described Daleks as "little green blobs in bonded polycarbide armour." (TV: Remembrance of the Daleks)

The Tenth Doctor modified energy blasters to pierce polycarbide and even temporarily disable the Daleks' weapons. (TV: Doomsday)

Nimrod wore bonded polycarbide armour while dealing with vampires. (AUDIO: Project: Twilight)

Kim Kronotska locked C'rizz in cuffs made of bonded polycarbide. (AUDIO: Memory Lane)