In a study of heat-sealing of polyethylenes, the T-peel fractured surfaces of bonded films of ethylene/1-octene copolymers with different 1-octene contents were characterized using Atomic Force Microscopy (AFM) and analyzed by fractal analysis. The AFM images gave visual evidence of a strong dependence on bonding temperature, peel rate, and 1-octene content. This dependence was demonstrated quantitatively by fractal analyses. This presentation elucidates the full details of this study.