The invention concerns the field of chemistry and relates to modified plastic surfaces with perfluoropolymers, which have improved assembly properties and/or sliding friction properties for use under tribological conditions and exhibit reduced wear and which can be used in particular in mechanical engineering in general and in the specialized fields of seals/dynamic sealing systems and automotive engineering. The aim of the invention consists in providing modified plastic surfaces with perfluoropolymers, whereby plastic surfaces which are provided for use under tribological conditions have substantially improved assembly properties and/or sliding friction properties and exhibit a very low degree of wear. This is achieved by modified plastic surfaces with perfluoropolymers, wherein modified perfluoropolymer (micro) powder is provided on the surface of plastics that have olefinically unsaturated double bonds at least on the surface in a covalently bonded manner via a radical coupling of the olefinically unsaturated double bonds to perfluoropolymer (peroxy) radicals of the modified perfluoropolymer (micro) powder after a reactive conversion under mechanical stress at room temperature.