Abstract: The invention relates to a press-fit pin (1) made from wire material for electrical contacts, in particular plug-in connectors. When using press-fit pins (1) made from wire material the problem of the tips (23) of the press-fit pins (1) being damaged by the press-fit tool has previously occurred. To be able to support a tool on press-fit pins (1) made from wire material without the tips (23) being damaged the press-fit pin (1) made from wire material is provided according to the invention with a shoulder element (3).

Abstract: The use of polyol derivatives with at least two alcoholic hydroxy groups and at least one fatty acid residue per molecule obtainable by reacting a starting polyol with a fatty acid or a fatty acid derivative, which can be obtained by using as a starting polyol diethanolamine, triethanolamine, diisopropanolamine, triisopropanolamine, dibutanolamine, and reaction products of ethylene oxide and/or propylene oxide with ethanolamine, isopropanolamine, butanolamine, or primary or secondary, aliphatic or aromatic amines, as internal lubricants and/or polyol with internal lubricant properties in the production of molded polyurethane parts is described. In this manner a much more uniform distribution of the internal mold lubricant and thus an increase in the ductility of the reaction mixture can be achieved, and even crosslinked polyurethane profiles can be produced by extrusion.

Abstract: A method is disclosed for detecting the onset of cracking in an article subjected to dynamic loading. The article is subjected to a dynamically changing load, and additionally is loaded and vibrated at its natural frequency. The onset of a crack in the article is determined by noting a change in its natural frequency.