Accelerator 553SN

Product Line Polymer additives

Accelerator™ 553SN is a cobalt accelerator for curing UP resins.

  • Brand

  • Chemical family

    Metal accelerator
  • CAS number

  • Physical form

  • Regional availability

    Africa, Asia, Asia Pacific, China, Europe, India, Middle East
  • Chemical name

    Cobalt(II) 2-ethylhexanoate in solvent mixture
  • Applications

    Accelerator™ 553SN is a solution of metal complexes, partly based on a cobalt salt in an organic solvent. Accelerator™ 553SN gives in comparison with the commonly used cobalt accelerator a much faster cure with comparable gel time. Accelerator™ 553SN is therefore very suitable where a faster demoulding time of the end product is required. Application areas are for instance: Gelcoat, RTM, production of polymer concrete. Accelerator™ 553SN can successfully be used for the production of cobalt pre-accelerated UP resins. The use of Accelerator™ 553SN will strongly reduce the gel time drift as observed with standard cobalt. Accelerator™ 553SN prevents foaming in VE resins with standard MEKP e.g. Butanox M-50.

Market Segments

Thermoset composites

Detailed description

Accelerator™ 553SN is a solution of 1.9% metal complexes for curing unsaturated polyester resins in combination with organic peroxide at room and elevated temperatures. Typically recommended for pre-acceleration of vinylester resins to avoid foaming during cure when using standard MEKP.


  • Accelerator


  • Engineered Stone,
  • Gelcoats,
  • Buttons,
  • Resin Transfer Molding,
  • Filament winding,
  • Vinylesters,
  • Hand lay-up & spray-up
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