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Butanox® M-60 (Cas 1338-23-4) is the work horse in GRP curing systems, with 10% higher active oxygen compared to Butanox® M-50. 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.
Description
Butanox® M-60 is Nouryon's workhorse methyl ethyl ketone peroxide (MEKP) for GRP curing systems, carrying 10% higher active oxygen than the related Butanox® M-50 grade. It's a medium-reactive, general-purpose MEKP with guaranteed low water content, used with a cobalt accelerator to cure unsaturated polyester resins at room and elevated temperatures.
The Butanox® M-60/cobalt accelerator curing system is particularly well suited to gelcoat resins, laminating resins, lacquers, and castings. It may also make light-resistant parts achievable in cases where a benzoyl peroxide/amine accelerator system would not.
Nouryon's other MEKP family for this site, Trigonox® V328 and Trigonox® V388, are supplied as solvent-diluted MEKP for general GRP curing; Butanox® M-60 is a higher-active-oxygen, concentrated MEKP grade — fabricators comparing curing agents often weigh these families against each other for reactivity and application fit.
| CAS Number | Total active oxygen |
| 1338-23-4 | 9.8-10.0 % |
| Appearance | EINECS/ELINCS |
| Clear colorless liquid | No.215-661-2 |
| TSCA status | |
| Listed on inventory | |
| Characteristics | |
| Density, 25°C | 1.14-1.18 g/cm³ |
| Viscosity, 20°C | 25 mPa.s |
| Application | |
Butanox® M-60 is used with a cobalt accelerator to cure unsaturated polyester resins at room and elevated temperatures, in gelcoat resins, laminating resins, lacquers, and castings. Thermal StabilityAs an organic peroxide, Butanox® M-60 is thermally unstable and can undergo self-accelerating decomposition above a certain temperature threshold. Its Self-Accelerating Decomposition Temperature (SADT), determined by the Heat Accumulation Storage Test per UN transport testing criteria, is 60°C. Related Equipment
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