Class 3!
(c) Blasting agents (for example, ammonium nitrate-fuel oil and certain water gels).
https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104573/gbu-39b-small-diameter-bomb-weapon-system/
https://www.defenseindustrydaily.com/raytheon-wins-usas-gbu-53-small-diameter-bomb-competition-06510/