Organic peroxides

Division 5.1 Oxidizers
Oxidizing substances that may not be necessarily combustible, but may yield oxygen and cause other materials to combust. Examples include hydrogen peroxide, ammonium, nitrate, potassium chlorate, and sodium nitrate.

Division 5.2 Organic Peroxides
Substances that are thermally unstable, can emit heat, give off harmful or flammable vapours, are liable to explosive decomposition, and react dangerously with other substances. Examples include acetylacetone peroxide, benzoyl peroxide, and peracetic acid.