AEM pre-compounds extend the upper temperature limit

  • Ethylene acrylic elastomer (AEM) pre-compounds with 15-20°C increased temperature resistance
  • Viable alternative to fluoroelastomers (FKM)
  • Applications: seals/gaskets (in air management systems & high-temperature coolant hoses)

DuPont Performance Polymers introduced a new and commercially available range of ethylene acrylic elastomer (AEM) pre-compounds that extend the upper temperature limit for AEM applications by 15 to 20°C, offering increased heat resistance combined with a long-term improvement in static heat ageing.

Viable alternative to fluoroelastomers (FKM)

The new Vamac AEM pre-compounds, currently under evaluation by major auto OEMs and Tier 1 suppliers for seals and gaskets, air management system applications and high-temperature coolant hose covers, are expected to offer a viable alternative to fluoroelastomers (FKM) at lower cost and lower specific weight, in a temperature range between 160°C to 190°C, especially where standard acrylic, ethylene vinyl acetate or AEM elastomers are no longer considered.

DuPont Vamac VMX5000 AEM pre-compounds

The DuPont Vamac VMX5000 AEM pre-compounds extend the upper temperature limit for AEM applications by 15 to 20°C, making them suitable for use in air intake manifold gasket applications, and for seals, gaskets and high-temperature coolant hose covers (source: DuPont)

Improved acid and base resistance

Vamac VMX5000 was developed to meet new challenges to automotive hoses and seals imposed by new industry trends such as high-pressure turbo charging, exhaust gas recirculation and other technologies requiring resistance to higher temperatures and aggressive fluids. The new pre-compounds also exhibit improved acid and base resistance compared to bisphenol cured FKM compounds, a feature of increasing importance for parts in contact with new oils containing aggressive additive packages or Blow-By. In addition, products in the Vamac VMX5000 Series incorporate a new filler system enabling easier production of coloured non-black parts, leading to better optical colour control combined with improved compression set resistance.

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