Thermal decomposition of melted 3,4-bis(3-nitrofurazan-4-yl)furoxan (DNTF) in isothermal conditions was studied. The burning rates of DNTF were measured in the pressure interval of 0.115 MPa. The thermal stability of DNTF was found to be close to the stability of HMX, while the burning rate of DNTF was close to the burning rate of CL-20. The thermocouple measurements in the combustion wave of DNTF showed that combustion of DNTF was controlled by the gas-phase mechanism. The DNTF vapor pressure was determined from thermocouple measurements and agreed well with data obtained at low temperatures under isothermal conditions.