The mechanical properties of polymer materials vastly depend on their chemical composition, manufacturing parameters and the geometry of the finished product. Due to the increasing application of polymeric materials in all branches of industry, the need for better understanding of their properties rises as well. For this reason, the effect of injection molding parameters on flexural properties of specimens made from poly(oxymethylene) (POM) was examined. In the introductory part of this thesis, description of polymeric materials, their classification, characteristics and fields of application are given. Since the topic of the thesis is associated with poly(oxymethylene), its properties are described in detail. Important factor concerning polymeric material properties is manufacturing process and procedure, both of which can be found in the middle section of the thesis. Equipment and its parts necessary for the injection molding process, whose parameters have significant impact on the quality of the final product, are also described. Consequently, parameters and requirements are described in order to make the final product of necessary quality in the shortest time and the lowest cost possible. Final part of the thesis describes an experiment conducted in Polymer testing laboratory, located at Mechanical engineering faculty in Slavonski Brod. Examination technique, description and characteristics of equipment used as well as properties of the material tested are presented. Finally, results and their analysis is carried out that establishes a direct correlation between manufacturing parameters and flexural properties of the finished product made via injection molding.