They are a mixture of liquid dinitrogen tetroxide serving as oxidizer with a suitable fuel, e.g. carbon disulfide, in the 3:2 volume ratio.
Panclastites are shock-sensitive and difficult to handle, requiring their mixing immediately before use; also the dinitrogen tetroxide is highly corrosive and explodes in contact with some chemicals.
Despite their brisance and detonation velocity being comparable with TNT, panclastites have virtually no use today.
During World War I, due to shortages of other explosives, French used some panclastite-class mixtures, which they called anilites, in small aircraft bombs.
Carbon disulfide and nitrogen tetroxide were stored in separate glass compartments, which were broken when the torpedo was launched and the chemicals mixed, and later were detonated by a contact fuse.