The primary objective of this program was to determine the possibility of desensitizing commercial nitroparaffins to such stimuli as high velocity impact, high temperature, and adiabatic compression of gases. The program involved two main areas of research: (1) the study of the shock sensitivity of nitromethane and nitromethane plus additives including higher nitroparaffins and (2) the study of the thermal stability of nitromethane and nitromethane plus additives. In the shock sensitivity study 62 additives were evaluated; 35 additives were selected for detailed study to determine the effect of concentration, and in some cases, the effect of temperature and confinement of the system. The best desensitizers and most effective sensitizers of those tested were determined. Suitable equipment and instrumentation were developed for the thermal stability study. Both purified 99-percent grade and commercial 96-percent grade nitromethane were used in decomposition studies made at temperatures from 300 deg. to 600 deg. F. The effects of selected additives were determined. The direction of further research is briefly considered.