The phase diagram and thermal decomposition for binary mixtures of cyc
lotrimethylenetrinitramine (RDX) and nitroguanidine (NQ) were investig
ated by DSC and using a microscope with a heat stage (MHS). The eutect
ic compositions of the RDX/NQ binary system were obained by constructi
ng a special phase diagram for the relation of the apparent fusion hea
t with the composition. The DSC results were confirmed by the phase di
agram of liquidus temperature vs. composition constructed from MHS dat
a.