It is known that the characteristics of plastic materials change depending on the test speed. In this study, a static tensile test and a high-speed tensile test were carried out using a Shimadzu AG-Xplus and HITS-T10, respectively, and the change in the tensile strength of plastic materials was observed. Depending on the material deformation speed, distinctive features appeared in their fracture surfaces. This suggests that it may be possible to designate the cause of fracture or damage of a product by observing the fracture surface. Here, the fracture surfaces in the static tensile test and high-speed tensile test were observed by EPMA, and the features of the fracture surfaces were summarized.