[en] The polymer Acrylonitrile Butadiene Styrene (ABS) is one of the most versatile polymers available today. Currently, Brazil does not produce ABS, which limits the Brazilian plastics industry to use the variations of this polymer imported, offered in the national market by local distributors. This study evaluated the effects of adding Cloisite Na® and Cubati Light Cream clays to the ABS polymer matrix and also the effects of ionizing radiation treatment on ABS and ABS/Clay composites as a way to modify a conventional ABS. Clays are naturally hydrophilic. Thus, in order to evaluate the difference between an organophilic clay and an organophobic, the Light Cream of Cubati was organophilized and the Cloisite Na® clay was used as received. A pre-organophilized Light Cream of Cubati and Cloisite Na® in Styrene Acrylonitrile (SAN) were prepared using a double screw extruder. The concentrates were added to the 1, 3 and 5% by weight ABS of the clays and specimens were injected. Part of the specimens was subjected to electron beam irradiation at a dose of 600 kGy. The irradiated and non-irradiated composites were characterized by tests of tensile strength, flexural strength, impact strength, thermal distortion temperature, Vicat softening point, thermogravimetric (TG) analysis, X-ray diffraction and electron microscopy of Field-emission scanning (SEM-FEG) and the correlation between the results was discussed. Improvements in mechanical properties were observed, except for impact resistance, in the materials added with the clays, and the best results were obtained with Cubati White clay. The treatment by ionizing radiation favored the ABS crosslinking process. (author)