Abstract: With TNT based mixture explosives for military purposes there often occur phenomenon of sublimation since some additive agents are used . Through infared analysis it has been found that DNT is the substance responsible for sublimation . Thermogravity analysis is then employed to investigate further the rules governing the sublimation . Factors influencing the sublimation and technique for its reduction have been determined . The theory of mass trasfer double diaphragms was extended to cases involving minor changes of mass concentration . It showed that the relative loss in weight is linear with time . Results of the experiments proved to be satisfactory .