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I would think it's the same as spontaneous combustion, so "självantändning" sounds right.
Explanation: Autoflammability: some materials have the feature of igniting in air in the absence of a spark or flame. The auto-ignition temperature is the minimum temperature at which the material will spontaneously ignite without application of any external ignition source.
Spontaneous combustion: "the process of catching fire as a result of heat generated by internal chemical action" (Webster's)