Ethylene vinyl acetate copolymer (EVA, 12, 28 and 45 % VA) has been subjected to electron beam radiation (EER) over a range of irradiation doses (20-200 KGy) in presence of a polyfunctional monomer (0.5-5 %). The tensile strength of EVA improves on irradiation. After air bomb aging the samples, irradiated with low radiation doses (20 and 50 KGy) containing 1% trimethylolpropane trimethacrylate or triallyl cyanurate show the best retention in tensile strength. Acids (HCl, HNO3) and alkali (NaOH) show marginal effect on changes＇ in tensile strength of irradiated samples. Peroxide cured samples show lower strength compared to irradiated ones after air bomb aging or acid and alkali treatment.