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The two types of high explosives are Primary explosives, which are easily ignited or detonated and are very sensitive to heat and friction, and Secondary explosives, which are usually much less sensitive to heat and friction and they typically have to be ignited through the use of other explosive materials.
Answer Wiki. The moment the weapons-grade fission material (normally U 235 or P 239) goes critical, an unstoppable fission reaction occurs that produces neutrons (which in turn cause more fission reactions) and EM energy, mostly in the form of thermal energy. The heat within the nuclear warhead itself quickly reaches 1M degrees.