This thesis focuses on parameters for injection molding of polymers. The method of injection molding itself and the material acrylonitrile butadiene styrene (ABS), which was used for the experimental part, are presented. The thesis also describes the procedure of tensile testing and tensile strength for ABS material. All of the results are graphically presented and explained. In conclusion the best combinations of parameters for successful spraying and improvement of the tensile strength of the material are presented.