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18. August 2020

The new issue of RFP Rubber Fibres Plastics is out!

Have a look at a testing solution that allows the study of crack growth in elastomer compounds (Metravib), and a study to identify a safe replacement for bis-DMTD as a curing agent (MLPC). Read how mold design and injection concept for LSR injection molding can be optimized by modern simulation techniques (Sigma Engineering), and learn more about a novel process to 3D print latex rubber, developed by researchers at Virginia Tech.

As the Corona pandemic continues to disrupt conference schedules this fall, we have news on the 2020 International Elastomer Conference (IEC) the International Rubber Conference 2020, and the World Rubber Summit 2020. Fakuma has launched a virtual platform and the 30th International Colloquium Plastics Technology at IKV is to be held strictly digital. Read more in the current issue of RFP Rubber Fibres Plastics.

The replacement of steel by Mg/Al for light-weighting in automotive applications results in electrochemical corrosion of EPDM sealing profiles. Scientists at Dow have come up with a remedy. Read how carbon black type can influence curing, physical, electrical, and processing properties of automotive EPDM compounds.

Elastomer O-rings can ramain leak-tight under purely static conditions even when CSR, CS and mechanical properties already indicate far advanced degradation. For this reason, a modified leakage test involving a small and rapid partial decompression of the seal was developed at the German Bundesanstalt für Materialforschung und –prüfung BAM that enables determining an end-of-lifetime criterion for O-rings with a safety margin for thermal shrinkage and vibrations. Maha Zaghdoudi, Anja Kömmling, Matthias Jaunich, Dietmar Wolff give an overview of ongoing long-term ageing investigations on elastomer seals in the current issue of RFP.

Technical articles in this issue:

  • The Co-operation – Steel cord adhesion mixtures without cobalt and resorcinol
    S. Mark, Ü. Özkütükcü (L. Brüggemann GmbH & Co KG)
    R. Blanco-Trillo, R. Schäfer (Allnex Germany GmbH)
    In the tire industry, cobalt salts and resorcinol resins are commonly part of mixtures for steel cord adhesion. However, regarding sustainability, work safety and environmental issues, these compounds have been increasingly considered as critical in recent years. Within the scope of a joint research cooperation, Brüggemann and Allnex developed a product that allows the elimination of both cobalt and resorcinol from steel cord adhesion mixtures.
  • Factors influencing curing, physical, electrical, and processing properties of automotive EPDM compounds – Effect of different carbon black types
    V. Thakur (Dow Europe GmbH), S. Wu (Packaging & Specialty Plastics)
    The replacement of steel car doors by Mg/Al doors for light-weighting results in electrochemical corrosion of the EPDM sealing profiles. This can be remedied, if the volume resistivity of EPDM profiles is increased by a reduction of carbon black content to below its percolation threshold. In this paper, the influence of different carbon black types onto the overall electrical and mechanical properties of the final compounds is reported.
  • Bis-DMTD as ETU replacement in polychloroprene
    I. Yarzabal (MLPC International)
    1,3-ethylene thiourea (ETU), an efficient curing agent for polychloroprene rubber (CR) and widely used accelerator for EPDM has been classified as a substance of very high concern (SVHC) after REACH evaluation. The French chemicals producer MLPC International has launched a complete study to identify the most appropriate safe replacement solution. A solution based on Bis-dimercapto-thiadiazole (Bis-DMTD) has proved most suitable.
  • Overview of ongoing long-term ageing investigations on elastomer seals
    M. Zaghdoudi, A. Kömmling, M. Jaunich, D. Wolff (Bundesanstalt für Materialforschung und –prüfung, BAM)
    Elastomer O-rings can remain leak-tight under purely static conditions even when CSR, CS and mechanical properties already indicate far advanced degradation. For this reason, a modified leakage test involving a small and rapid partial decompression of the seal was developed that enables determining an end-of-lifetime criterion for O-rings with a safety margin for thermal shrinkage and vibrations.

Further information about the new issue at https://www.gupta-verlag.com/magazines/rfp-rubber-fibres-plastics-international/03-2020.

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