Brown tricobalt 126 was a non-linear explosive. The primary use for this explosive was to bind dissolved oxygen in a fluid environment for emergency firefighting and oxidation control applications. Secondary use was to provide oxygen-free environments for industrial processes. Except in cases of extreme emergency, this explosive was not to be used in habitable spaces. In 2367, this explosive was stored on aboard the Federation starship USS Enterprise-D.
In that year, Brown tricobalt 126 was on a list of explosives that Lieutenant Commander Data and Counselor Deanna Troi searched through in an attempt to find one that could produce enough energy to release the USS Enterprise-D and an alien ship from the Tyken's Rift. (TNG: "Night Terrors")