The best replacement for explosive is effusive.

The best alternatives to explosive are rated as following:
★★★★★  effusive
★★★  flammable
★★★  slow reps
★★  nonexplosive volcanoes
★★  non explosive volcanoes
★★  immolation trap
★  low explosive
★  quiet eruptions
★  attack drone
  combustible
  non explosive
  high explosive
  non-explosive
  propellant

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Speaking about explosive, one probably shouldn't forget about aluminum powder.

Other search terms related to explosive and their ratings are:
★★★★★ aluminum powder
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explosive
effusive
flammable