Dynastreem
From Tardis Wiki, the free Doctor Who reference
Dynastreem or Dynastream was a material used on Earth in the second half of the 20th century. It was believed indestructable, until the robot K1, built by Professor J. P. Kettlewell, managed to disintegrate a safe made from it. (TV: Robot [+]Loading...["Robot (TV story)"])
The Genetrix's balloon was made of dynastream. (PROSE: Sunset Over Venus [+]Loading...["Sunset Over Venus (short story)"])