A low viscosity, unpromoted, flame retardant patented epoxy vinyl ester with F-Cat technology. This patented technology resin that exhibits no foaming, excellent exotherm control, and industry-leading storage stability Hetron™ FR 992 produces products with excellent flame retardancy, high strength characteristics, excellent impact strength and toughness, fast wet-out and low drainage, and excellent corrosion resistance to acidic and alkaline environments.