Trigonox 21S

Product Line Organic peroxides

Trigonox® 21S is an initiator for (co)polymerization of ethylene, styrene, acrylonitrile and (meth)acrylates. Curing agent for unsaturated polyester resins.

  • Brand

  • Chemical family

    Organic peroxide
  • CAS number

  • Physical form

  • Regional availability

    Asia Pacific, Europe, Latin America, North America
  • Molecular Weight

  • Chemical name

    tert-Butyl peroxy-2-ethylhexanoate
  • Molecular drawing

    Organic peroxide
  • Applications

    Trigonox® 21S (tert-Butyl peroxy-2-ethylhexanoate) can be used for the market segments: polymer production, thermoset composites and acrylics with their different applications/functions. For more information please check our website and/or contact us.

Market Segments

Polymer production

Detailed description

Trigonox® 21S is an efficient initiator for the production of Low Density Polyethylene (LDPE). It is used both for tubular and autoclave processes. In most cases a combination with other peroxides is used to ensure a broad reactivity range. In suspension polymerization processes, Trigonox® 21S can be used for the polymerization of styrene at approximately 90°C. Trigonox® 21 has an activity comparable with Dibenzoyl peroxide (Perkadox L-W75). Typically, Trigonox® 21S is used in combination with initiators such as tert-Butyl peroxybenzoate (Trigonox® C) and tert-Butylperoxy 2 ethylhexyl carbonate (Trigonox® 117).


  • Polymerization initiator


  • LDPE,
  • Polystyrene
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Thermoset composites

Detailed description

Trigonox® 21S, tert-Butyl peroxy 2 ethylhexanoate, is a perester which is used for the curing of unsaturated polyester resin at elevated and high temperatures. Trigonox® 21S is preferred for the curing of UP resin based Hot Press Molding formulation (such as SMC and BMC) in the temperature range of 120 - 160°C. As Trigonox® 21S is a high reactive peroxide, it is very suitable as a kicker in formulations for pultrusion and SMC/BMC. In combination with a cobalt accelerator, Trigonox® 21S is also applicable for the cure of UP resins in the temperature range of 60°C and higher. Application area can be air drying lacquers, diplacquers, wall panels, filament winding, etc.


  • Curing agent


  • Hot press molding,
  • Pultrusion,
  • CIPP,
  • Acrylic solid surface
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Acrylics production

Detailed description

Trigonox® 21S is an initiator for (co)polymerization of (meth)acrylates.


  • Polymerization initiator


  • Acrylics
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Get in touch!

For more information about Trigonox 21S, please contact our technical experts. We look forward to hearing from you.

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