Stefan Lamnevik Inc. has been contracted by FOI to describe how self-ignition of ammunition may occur, FOI contract number 804096. Two possible ways of self-ignition have been identified self-ignition of smokeless propellants and self-ignition of white phosphorous in smoke ammunition. Self-ignition of smokeless propellants occurs when the stabilizers have been consumed. The consumption rate is doubled when the temperature is increased by 10 degrees. An expected lifetime of smoke-less propellants in Sweden is about 40 years. The mean annual temperature of northern Sweden is -1 to +1 °C, of southern Sweden +6.5 to +7.3 °C. The difference in temperatures corresponds to a lifetime of 25 years in southern Sweden compared to 40 years in northern Sweden. Self-ignition of white phosphorous in ammunition occurs if the melting point of white phosphorous is reached (44.1 °C). The expansion on melting may crack the casing, exposing the liquid phosphorous to the air which will result in self-ignition.