Trigonox 21LS

Product Line Organic peroxides

Trigonox 21LS is a peroxide formulation used for curing unsaturated polyester resins at elevated and high temperatures.

  • Brand

  • Chemical family

    Organic peroxide
  • CAS number

  • Physical form

  • Regional availability

  • Molecular Weight

  • Concentration

  • Chemical name

    tert-Butyl peroxy-2-ethylhexanoate
  • Molecular drawing

    Organic peroxide
  • Applications

    Trigonox 21LS is a perester formulation based on tert-butylperoxy-2-ethylhexanoate, which is used for the curing of unsaturated polyester resin at elevated temperatures. Trigonox 21LS is preferred for the curing of UP resin based Hot Press Moulding formulations (SMC, DMC, BMC, etc) in the temperature range of 120 - 160°C. As Trigonox 21LS is a high reactive peroxide, it is very suitable as a kicker in formulations for pultrusion and SMC/BMC in combination with peroxides like Trigonox C and Trigonox 29-B50. Trigonox 21LS gives in comparison with Trigonox 21 a long shelf life stability of the compound, without affecting the cure speed, even when iron oxides or carbon black are used as pigment.

Market Segments

Thermoset composites

Detailed description

Trigonox 21LS is a peroxide formulation containing a special inhibitor. Used as kicker peroxide in high-temperature cure systems, while also allowing for long storage stability of the BMC and SMC pre-preg.


  • Curing agent


  • Hot press molding,
  • Pultrusion
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