RPG-40

The RPG-40 was an anti-tank hand grenade developed by the Soviet Union in 1940. Its anti-tank capability came from blast effect produced by the detonation upon contact of 760 grams of explosive contained in it. This effect enabled about 20 mm of armour to be penetrated, and secondary damage, such as spalling, by contact with thicker armour. This made the grenade very effective against earlier German tanks, but ineffective against later models, such as the Panzer IV and the Panzer V, leading to the RPG-43 replacing it in 1943.