Wikipedia
Baratol
Baratol is an explosive made of a mixture of TNT and barium nitrate, with a small quantity (about 1%) of paraffin wax used as a phlegmatizing agent. TNT typically makes up 25–33% of the mixture. Because of the high density of barium nitrate, Baratol has a density of at least 2.5.
Baratol was used as the "slow" compound in the explosive lenses of early atomic bombs with Composition B often used as the "fast" explosive component. Atomic bombs like those detonated in 1945 at Trinity, the Soviet Joe 1 in 1949, and in India in 1972, used Baratol and Composition B.
Baratol was also used in the Mills bomb, a British hand grenade.
Baratol has a detonation velocity of approximately 4,900 metres per second.