Improving temperature sensitivity of the mechanical strenght of foamed propellants

Mechanical and burning characteristics of foamed propellants used as combustible cartridges have to be well composed in order to provide their proper function in a weapon. A basic problem, which emerges when mechanical stability at the shot is unsufficient, is a phenomenon called gas-slipping. Gas-slipping occurs when a cartrigde cannot withstand the boost caused by the igniting-process. In this case gas gets (""slips"") from the cartridge chamber into the gun barrel before the projectile arrives. This effect causes undesirable impacts on a weapon, like low projectile velocities and low reproducibility of shot-series. Especially the temperature behaviour of the mechanical properties of foamed propellants plays an important role in these considerations.