The fracture behavior for a film of ethylene-propylene block copolymer has been studied applying the essential work offracture method. Double-Edge Notch Tensile (DDENT) specimens were sharpened by two different techniques. Thefirst technique has been using the conventional method of the razor blade; the second one, using a femtolaser ablationbeam. The notch tip radiuses were quite similar. In the case of the razor blade method, some plastic deformation at thecrack tip was found. The essential work of fracture (we) value for femtolaser sharpened specimens was significantlyshorter than for the razor blade sharpening specimens. In this order, the slopes corresponding to the plastic workdissipation factor (wp) were quite similar. Results aim to say that the initiation point and the corresponding energy forwhich we is achieved may be considered as the energy of initiation (J0) for the crack growing propagation. Thepropagation behavior seems to be the same for both notch sharpening methods. The J0 value at initiation and we werequite similar; the wp terms are analyzed from J-R plots.