Described herein is a method of using glass fibers having a tensile strength according to DIN ISO 527-5 of 86.0 to 92.0 GPa, a tensile elastic modulus according to DIN ISO 527-5 of 2600 to 3200 MPa and a softening point according to DIN ISO 7884-1 of 900° C. to 950° C., the method including using the glass fibers to increase an impact strength and/or breaking elongation of molded articles made of molding materials including thermoplastic polyamides and elastomers.