Nano-layers reportedly make films tougher. This webinar discusses whether the toughness of brittle materials can be improved by coextruding them into nano-layers with a less-brittle component and blowing the composite into film. Coextruded blown films with internal structures consisting of micro-layers and nano-layers have been made for the first time by means of the newly invented Layer Sequence Repeater (LSR). Two brittle materials, one amorphous (TOPAS® COC) and the other crystalline (EVAL America’s EVOH), were coextruded into 21 nano-layer bundles placed within a 4 micro-layer matrix. Initial tests aimed at brittle failure showed that films containing EVOH had improved barrier even with flexing, and films containing both COC and EVOH had higher transverse elongation than their respective single micro-layer controls.