Butanox M-50A

Product Line Organic peroxides

Butanox M-50A is a phthalate-free, medium-reactive, general purpose MEKP with low water content for curing unsaturated polyester resins at room temperature.

  • Brand

  • Chemical family

    Organic peroxide
  • CAS number

  • Physical form

  • Regional availability

  • Chemical name

    Methyl ethyl ketone peroxide
  • Molecular drawing

    Organic peroxide
  • Applications

    Butanox M-50A is a multipurpose catalyst for the room temperature cure of promoted unsaturated polyester resins. Unpromoted unsaturated polyester resins can be heat-cured with Butanox M-50a in the temperature range of 100-127°C. Butanox M-50A also has a high MEKP monomer content which may provide faster gel times in some resin systems.

Market Segments

Thermoset composites

Detailed description

Butanox M-50A is the phthalate-free work horse in GRP curing systems. Medium-reactive, general purpose methyl ethyl ketone peroxide (MEKP) with guaranteed low water content, used for curing unsaturated polyester resins in the presence of a cobalt accelerator at room and elevated temperatures.


  • Curing agent


  • Engineered Stone,
  • Gelcoats,
  • Centrifugal casting,
  • Coatings,
  • Continuous Laminating,
  • Resin Transfer Molding,
  • Vinylesters,
  • Spray fillers,
  • Hand lay-up & spray-up
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Get in touch!

For more information about Butanox M-50A, please contact our technical experts. We look forward to hearing from you.

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