Description

Trigonox® V388 is a general-purpose methyl ethyl ketone peroxide (MEKP) curing agent from Nouryon, supplied as a clear, colorless liquid with 9.8–10.0% total active oxygen — a higher active oxygen content than the related Trigonox® V328 grade (8.8–9.1%). Used with a cobalt accelerator, it cures unsaturated polyester (UP) resins at room and elevated temperatures and is developed for general-purpose GRP and non-GRP applications such as laminating resins and castings.Its higher SADT (55°C, versus 50°C for V328) and longer specified shelf life (6 months versus 3 months under the same 25°C maximum storage temperature) reflect the somewhat greater thermal stability that comes with its formulation. As with other general-purpose MEKPs in this range, for marine laminates specifically, a special MEKP with low water content and no polar components — Butanox® M-50 — is recommended instead to reduce the risk of osmosis blistering.

CAS Number	Active oxygen
1338-23-4	9.8-10.0 %
Appearance	EINECS/ELINCS
Clear Colorless Liquid	No.215-661-2
Color
Clear
Characteristics
Density, 20℃	1.120 g/cm³
Flashpoint	37 (Closed Cup) / > 63 (Open Cup)℃
Application
Trigonox V388 is general purpose methyl ethyl ketone peroxide (MEKP) for the curing of unsaturated polyester resins in the presence of a cobalt accelerator at room and elevated temperatures.The curing system Trigonox V388/cobalt accelerator is developed for general purpose GRP- and non GRP-applications such as the curing of laminating resins and castings. Practical experience throughout many years has proven that for marine applications a special MEKP with low water content and without polar compounds is demanded in order to prevent from osmosis and other problems. Butanox M-50 is the MEKP advised for this application.For room temperature application it is necessary to use Trigonox V388 together with a cobalt accelerator (e.g. Accelerator NL-49PN).