125mm D-81 line of guns utilizes two-part ammunition that consists of a propelant charge and different projectile parts (APFSDS projectiles have an incremental charge for greater energy).
The propellant case is of a semi-combustible type, consisting of a fully combustible pyroxylin-cellulose, TNT-impregnated tube set in a rear stub made of BV-11 steel, that also incorporates the GUV-7 electric primer.
The gunpowder is of high-nitrogen pyroxylin straw type.
The charges are produced by the State Scientific Research Institute of Chemical Products in Kazan.
Composition: 15/1tr V/A (1.5mm burning arch high-nitrogen pyroxylin stick gunpowder) + 12/7 V/A (1.2mm burning arch 7-channel high-nitrogen pyroxylin stick gunpowder) + VTKh-20 (flame-supressing gunpowder) + DRP-3 initiating gunpowder.
15/1tr V/A completely replaced with improved 12/7 V/A.
New high-energy propellant that allows to increase APFSDS muzzle energy by 5% over the previous charge models.
This page is © 2002-2005 Vasiliy Fofanov,
with contributions by Varban Peshkov of "Arsenal" enterprise, Bulgaria.