A rotor cup for an open-end spinning device comprises a supporting base body which is provided with an insert. The insert comprises the fiber guiding surfaces, namely a fiber sliding surface and a fiber collecting groove. The insert is centered radially in the base body and is supported axially with a stopping face at the base body and crimped therein.

 
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> Waterborne thermosetting compositions containing alternating copolymers of isobutylene type monomers

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