Two urethane diacrylates—one aromatic, M1100; and the other aliphatic, M1200—have been used to prepare elastic films under electron beam (EB) irradiation. Two monofunctional diluents are used;N-vinyl pyrrolidone (NVP) is used as the reactive diluent monomer, and the second one, called the codiluent, is chosen from a series of acrylated monomers withTgvalues lower than that of NVP. Pencil hardness; gel content; swelling ratio in acetone; and mechanical properties such as yield strength, break strength, elongation, and Young's modulus of the cured films are determined. Among the various codiluents used, vinyl acetate (VAc), cyclohexyl acrylate (CHA), and tertiary butyl acrylate (t-BA) played a significant role in inducing improved Theological properties in the cured films.