2,4,6-Trimethoxy-1,3,5-triazine (TMT) is a triazine derivative. It exists in three different polymorphic forms: α-, β- and γ-. 2,4,6-Trimethoxy-1,3,5-triazine molecules are planar in all the three polymorphs. Polymorphic forms differ in the mode of packing of the molecules in the crystal. Kinetics and mechanism of the reaction of radiolytically produced hydrated electron with TMT using pulse and steady-state radiolysis techniques has been studied. TMT undergoes methyl transfer in the melt and in the solid-state, to afford, 2,4,6-trioxo-1,3,5-trimethylazine.