Dwarf star alloy was a material obtained from white dwarf stars. It was very expensive and very heavy. It was impregnable to any particle or radiation (TV: Day of the Moon) and was the only material that could hold time sensitive species. (TV: Warriors' Gate)
Father of Mine was restrained with a chain made from dwarf star alloy. (TV: The Family of Blood)
In 1969, the United States of America's military constructed a cell of dwarf star alloy in Area 51 to hold the Eleventh Doctor, though its true purpose was to give the Doctor and his friends a safehouse hidden from detection by the Silence. (TV: Day of the Moon)
In 2009, UNIT had experimental diving suits made with dwarf star alloy. They were capable of surviving tens of kilometres under the ocean. (AUDIO: Submission)
Rorvik's spaceship was made from dwarf star alloy and required very large engines to achieve flight. (TV: Warriors' Gate)
Silas Cadwell had a gun that fired pieces of dwarf star alloy. (PROSE: Fear of the Dark)
Roz Forrester used dwarf star alloy to crush an N-Form. (PROSE: So Vile a Sin)
Father Kreiner had a glove made of dwarf star alloy. (PROSE: Interference - Book Two)
A Sontaran ship provided with this alloy was captured in an alternative Death Zone on Gallifrey. The Fifth Doctor employed it to seal a dimensional hole. (AUDIO: The Five Companions)