Other Names
Sulfur Trioxide in Chlorsulfonic Acid
Use
FS is a mixture of sulfur trioxide and chlorsulfonic acid. It is a liquid which freezes at -30 degrees C (-22 degrees F) and boils at 80 degrees C (176 degrees F). When FS is atomized in the air, it hydrolyzes with moisture that is present to produce a smoke with a total obscuring power (TOP) of 2,550.
Source(s)
Old Chemical Weapons Reference Guide (1998)
TM 9-1904, Ammunition Inspection Guide (1944)
