In order to estimate the ability of an anti-tank weapon to disable an armoured target, good knowledge of behind armour debris is important. The debris fragments that are produced in a perforating event can have an effect in a much larger area than the residual penetrator itself can. If these fragments are sufficiently hot, and sufficiently large, they may ignite flammable materials they come into contact with, such as fuels, oils, clothes, or gunpowder. An experimental campaign consisting of five shots have been performed, where an EFP has been fired against an armoured plate. The perforation was registered using flash X-ray and an Ultra-High-Speed-Video-Camera. The resulting behind armour debris of each experiment was collected in a fibreboard container, and the fragment mass distribution was evaluated for one experiment. A FLIR-camera2 was used to estimate the temperature of the debris in-flight. The event has been simulated numerically using the hydrocodes Grale2D and LS-DYNA, and the velocity, dispersion, and temperature of the fragments were calculated. The temperature measurements from the FLIR-camera agree well with the temperature estimates from the hydrocodes, and with theoretical estimates. The temperatures are estimated to lie in the span 265 - 331 °C, which is close to the critical temperature of ignition for certain HTPB/RDX-based powders, for corresponding fragment masses.