Thermite

 is a quest item in Fallout: New Vegas.

Characteristics
Thermite is a pyrotechnic composition of a metal powder and a metal oxide, which produces an exothermic oxidation-reduction reaction known as a thermite reaction, used to burn through metals and demolition.

In the quests How Little We Know or For the Republic, Part 2, Troike mentions he made some Thermite, enough to destroy the entire Omerta weapons stockpile with the tampered light in the basement of Gomorrah.