Study of PBAT films formulations with nanoclays and nano-TiO2 for packaging application The aim of this work was to evaluate the combination of nanofillers - organically modified montmorillonite (MMT), sepiolite (SEP) and nano titanium dioxide (TiO2) - on the tensile properties and light barrier of poly(butylene adipate-co-terephtalate) (PBAT). A 2³ factorial rotatable central composite design (α=1.682) with 3 central points was conducted. Five concentrations (in mass) for each factor were used (0.0, 2.0, 4.5, 7.0 and 9.0 % for MMT); (0.0, 1.0, 2.5, 4.0 and 5.0 % for SEP); (0.0, 0.2, 0.7, 1.2 and 1.5 phr for TiO2). The clays concentrations were determined from percolation threshold: 4 % for sepiolite, considering the nanorod shape and 7 % for montmorillonite established from Nielsen model, assuming lamella shaped clays. Both methods require the clays aspect ratio, which were accessed by scanning electron microscopy (TEM). The films were prepared using a Drais mixer, a hot press and a blown film extruder. The light transmission percentage of ultraviolet (UV) and visible (Vis) radiation were measured. The mechanical properties – Young’s modulus, maximum tensile strength and elongation at break - were accessed according to ASTM D882-12. Only nano-TiO2 factor was statistically significant on light transmission, for UV and Vis radiation. The effect values for TiO2 factor obtained by experimental design (DoE) analysis were negative indicating that the increase of its concentration favors the reduction on light transmission. Young’s modulus showed an increase, especially for the sample with concentrations of 7 % MMT, 4 % SEP and TiO2 1.2 % for which the modulus increased around three times, and this increase could be associated to a good dispersion and reinforcement effect of the nanoclays in the polymer matrix. The nanofillers and its combinations showed statistically significant effetcs for this property by DoE analysis. The addition of nanofillers did not present statistical influence on the tensile strength and the elongation.