CONTRIBUTION TO REDUCING THE TEST TIME FOR DETERMINING THE LONG TERM STABILITY OF SEALANTS

At present, in our research group at the University of Leipzig the following tests are being carried out on selected elastomeric sealants (polysulphide, polyurethane, silicone, and for comparing EPDM and polychloroprene): alternative again with flourenscent UV lamps; alternate aging with xenon arc lamps; thermal aging; open air weathering; room storage. We characterize the change in materials properties through mechanical test methods (tensile strength and elongation at break), thermoanalysis (DSC) and chemical spectroscopy (FT-IR, PAS). Ther intermediate evaluation of the results shows, that the similarity of the curves of artificial aging and the open air weathering is clearly visible. Additional series of tests have been started with the following goals: prolonging the stress temperature so as to reduce the test time; combination of artificial weathering with extension and compression; verification trials on joint models. The tests should be continued until a rapid aging method is found which produces virtual agreement with that of natural aging.

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 937-955

Subject/Index Terms

Filing Info

  • Accession Number: 00779823
  • Record Type: Publication
  • Report/Paper Numbers: SP 164-47
  • Files: TRIS
  • Created Date: Dec 15 1999 12:00AM