Finitoglass

Finitoglass was a type of glass known for its durability. It could withstand X-tonic rays for an extended time, based on its thickness.

On the planet Midnight, the Leisure Palace was fitted with huge domes of Finitoglass fifteen feet thick, ensuring protection from the rays. In the shuttle buses, the glass was only strong enough to hold back the radiation for a few minutes. (TV: Midnight)

The Research Base of Flydon Maxima had windows of Finitoglass in the observation gallery. (PROSE: The Depths of Despair)

The Prime Minister of the Daleks ruled from a cylindrical cabinet of transparent Finitoglass. (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe)