The shell contained two canisters separated by a rupture disk. The compartments were filled with two liquid precursor chemicals for (denominated DF) and a mixture of Isopropyl Alcohol and isopropyl amine (denominated OPA) is in a second canister. The isopropyl amine binds the Hydrogen Fluoride generated during the chemical reaction. When the shell was fired the force of the acceleration would cause the disk between them to breach and the spinning of the projectile facilitated mixing. The two precursor chemicals would react in flight to produce sarin and when the shell reached its target the sarin would be released.
The shells were meant to be stored and transported with only the OPA compartment loaded; the fuse and the DF compartment would be inserted shortly before firing.
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