
The BLU-52A/B was filled with riot control agent (i.e., 2-chlorobenzalmalononitrile [CS]). The BLU-52/B ad BLU-52A/B, standard Air Force bombs, were designed for delivery by high and certain low performance aircraft .
The BLU-52 A/B chemical warfare bomb was a modified BLU-1 C/B fire bomb containing CS2 riot control agent. The bomb contained no fuze or explosive parts, and the bomb could be fitted with fins. The BLU-52/B was filled with CS1 and the BLU 52A/B was filled with carbon disulphide (CS2).
The BLU-52 did not have an explosive train, it relied entirely upon the breakup of the case at impact for agent dispersion.
Filler is CS (250-259 lb, 113-117 kg)
Bomb, 500 lb Fire, BLU-1C/B
Old Chemical Weapons and Related Materiel Reference Guide (2018)