Product Description

Trigonox 21S is a perester used for the curing of unsaturated polyester resin at elevated and high temperatures. It is preferred for curing UP resin-based Hot Press Molding formulations (such as SMC and BMC) in the temperature range of 120–160°C. As Trigonox 21S is a high-reactivity 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 areas can include air drying lacquers, diplacquers, wall panels, and filament winding. Evergreen Chemicals supplies Trigonox 21S as an authorized Nouryon distributor.

CAS Number	Active oxygen content peroxide
3006-82-4	7.40 %
Appearance	EINECS/ELINCS
Clear colorless liquid	No.221-110-7
TSCA status
Listed on inventory
Specifications
Assay	≥ 97.0 %
Color	≤ 20 Pt-Co
Inorganic + organic hydrolysable chloride	≤ 100 mg/kg
TBHP	≤ 500 mg/kg
Viscosity, 20℃	4.3 mPa.s
Applications
● SMC/BMC Hot Press Molding — 120–160°C ● Pultrusion and SMC/BMC kicker — high-reactivity co-initiator ● Cobalt-accelerated UP resin cure — 60°C and higher ● Air drying lacquers, diplacquers ● Wall panels ● Filament winding ● Polymer production, thermoset composites, acrylics