Description

Trigonox® V328 is a methyl ethyl etone peroxide (MEKP) curing agent from Nouryon, supplied as a clear, colorless liquid in a solvent mixture with 8.8–9.1% total active oxygen. It is used together with a cobalt accelerator to cure unsaturated polyester (UP) resins at ambient and elevated temperatures, and is formulated for general-purpose glass-reinforced plastic (GRP) and non-GRP applications such as laminating resins and castings.

For marine laminates specifically, low water content and low polar-component MEKPs are preferred to reduce the risk of osmosis blistering over the life of the part — Trigonox® V328's sister grade Butanox® M-50 is the recommended choice for that application, while V328 covers general GRP curing.

CAS Number	TSCA status
1338-23-4	Listed on inventory
Appearance	EINECS/ELINCS
Clear Colorless Liquid	No.215-661-2
Total active oxygen
8.8-9.1 %
Characteristics
Density, 20℃	1.112 g/cm³
Flash point	29 (Closed Cup) / ≥ 63 (Open Cup)℃
Application
Trigonox® V328 is a methyl ethyl ketone peroxide (MEKP) for the cure of unsaturated polyester resins in the presence of a cobalt accelerator at ambient and elevated temperatures.The curing system Trigonox® V328/cobalt accelerator is developed for general purpose GRP- and non GRP-applications. Examples: 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 components is demanded in order to prevent from osmosis and other problems. Butanox M-50 is the MEKP preferred and advised for these kind of applications.For room temperature application it is necessary to use Trigonox® V328 together with a cobalt accelerator (e.g. Accelerator NL-49P) to obtain a proper reactivity.