The M825 WP is a 155mm artillery projectile, designed to produce smoke-screens of 5-15 minutes in duration8. Its two main components are the projectile carrier - a hollow forged steel shell - and the payload - consisting of 116 white phosphorus wedges9.
Typically fired from 155mm howitzers, with an effective range of between 3 and 18 km, the M825 WP generally bursts between 50 and 250 meters above ground. A timed charge at the front of the shell is activated and the projectile releases the 116 white phosphorus wedges, which fall to the ground in an elliptical pattern of up to 200 meters in the long axis.
