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Trigonox® 249 is a peroxide blend specially developed for curing unsaturated polyester and vinylester resins at ambient conditions in conjunction with a metal accelerator. Trigonox® 249 can also be solely applied for the curing of UP resins at elevated temperatures.
Trigonox 249 is a peroxide blend of methyl ethyl ketone peroxide (MEKP, CAS 1338-23-4) and cumyl hydroperoxide (CHP, CAS 80-15-9) in dimethyl phthalate, developed by Nouryon for curing unsaturated polyester and vinyl ester resins. It is used with a metal accelerator at ambient temperature, or on its own at elevated temperature.
Its main advantage is a lower exotherm than standard MEKP grades such as Butanox M-50. Less heat during cure makes it well suited to cast polymer and laminate production in warm and hot climates, where a standard MEKP can cure too hot. A related grade,Trigonox 249 VR, is also available. See all grades in the organic peroxide range.
| Property | Value |
| Chemical name | Methyl ethyl ketone peroxide and cumyl hydroperoxide, solution in dimethyl phthalate |
| CAS number | 1338-23-4; 80-15-9 |
| EINECS / ELINCS | 215-661-2; 201-254-7 |
| Appearance | Clear liquid |
| Active oxygen | 8.2–8.7 % |
| Density / viscosity, 20 °C | 1.14 g/cm³ / 24.8 mPa·s |
| SADT | 60 °C |
| Maximum storage temperature (Ts max) | 25 °C |
| Transport classification | Organic peroxide type D, liquid; Division 5.2; UN 3105 |
| Standard packaging | 25 L HDPE can, 25 kg net |
| Shelf life | At least 3 months after delivery when stored as recommended |
The Trigonox 249 product data sheet (TDS/PDS) lists specifications, thermal stability data and storage limits. The safety data sheet (SDS/MSDS) covers hazard classification, transport and emergency measures. English documents can be downloaded below; Chinese versions are available on request.
- Cast polymer: lower-exotherm cure of UP resin castings.
- Laminates: cure of UP and vinyl ester laminates with a metal accelerator at ambient temperature.
- Warm and hot climates: an alternative to standard MEKP where high workshop temperatures make exotherm hard to control.
- Elevated-temperature cure: used alone, without accelerator, at elevated temperature.
Store Trigonox 249 below 25 °C in tightly closed original containers, in a dry, well-ventilated area away from heat, ignition sources and direct sunlight. Keep it away from reducing agents such as amines, acids, alkalis and heavy metal compounds such as accelerators, driers and metal soaps. Never mix it directly with an accelerator: add each to the resin separately.
A: Trigonox 249 is a Nouryon blend of methyl ethyl ketone peroxide and cumyl hydroperoxide in dimethyl phthalate. It cures unsaturated polyester and vinyl ester resins with a metal accelerator at ambient temperature, or alone at elevated temperature.
A: Both cure UP resins with a cobalt accelerator, but Trigonox 249 gives a lower exotherm than standard MEKP grades such as Butanox M-50. That makes it better suited to cast polymer and laminates in warm and hot climates.
A: The specification is 8.2–8.7 % active oxygen.
A: Store it below 25 °C in closed original containers, away from heat, sunlight, reducing agents, acids, alkalis and metal compounds. Under these conditions it stays within specification for at least 3 months after delivery.
A: The English product data sheet and safety data sheet can be downloaded on this page. Send an inquiry for Chinese versions.
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