FOX-7, 1,1-Diamino-2,2-dinitroethylene (C2H4N4O4) is a recently developed energetic material with low sensitivity and high performance. FOX-7 was developed by FOI, Swedish Defence Research Agency, it is produced by the Swedish company EURENCO Bofors and can be obtained from there. This report concentrates on characterisation of crystallised FOX-7 and presents data on thermal stability, processes involved during phase transitions and crystal structure. FOX-7 was crystallised from various solvents and the products were characterised. A gold coloured non-transparent product is formed during heating of crystallised FOX-7 at ~220°C. Elemental analysis of the product points towards FOX-7 molecules present in the product. X-ray studies indicate the structure of this material to be amorphous. A long term storage stability study was started. Samples were after 11 months of storage at room temperature, 60°C and 80°C. The result shows that FOX-7 is thermally very stable.