The experimental results confirm that using a 5% addition of MEPECO to vinyl ester resin its flammability property at 17.07% increase in HRR. This improvement was confirmed by the contact angle at 49.82º or 10.51% more hydrophilic than pure VE. Using TGA, the 15.16% increase in activation energy maximized its thermodynamically capacity to become thermally stable. In mechanical properties, a significant upgrading of flexural strength at 14.93% determined MEPECO capacity to let vinyl ester resin withhold a significant amount of stress and load upon application of outside force. Here, SEM shows the dispersion of the additives over the microstructural defects of VE after curing. The spectral analysis using FTIR also support this claim upon the overall reduction of the functional groups' intensities indicating the a formation of new crosslinking and chemical interactions. Overall, the MEPECO is a novel, efficient ecothermoset additive with potential value because of its ability to advance the flame retardancy and mechanical properties of vinyl ester resin. Hence, making it a potential attractive additive for the green composite and coating industries.