To determine the EPECO50 influence in terms of flammability, using maleation process wherein maleic anhydride dissolved in acetone was used as a solvent to solubilize EPECO50, this reaction was chosen because of its capacity to generate hydrolysis and to cleave chemical bonds . In the concept of hydrolysis, since acetone contains carbonyl (C=O) and maleic anhydride has anhydride functional group, upon interaction with thermoset polymer, a water molecule can release. Here, we hypothesized that hydrolysis reaction has increase the hydrophilicity of the blend. Hence, after maleation with maleic anhydride, addition to vinyl ester resin was optimized at a certain amount, which is as follows: 0%, 1%, 3%, 5%, and 7%. Figure (d) used the PCFC to determine the optimal amount by getting the HRR value. Here, 5% of MEPECO added to vinyl ester resin (VE_5%MEPECO) showed a 17.07% increase in HRR (536.229 kW/m 2) . The remaining trends in PCFC HRR are as follows: VE_7%MEPECO (587.033 kW/m 2 ) > VE_3%MEPECO (609.194 kW/m 2) > VE_Neat (646.568 kW/m 2) > VE_1%MEPECO (705.839 kW/m 2) . Looking at the wettability property and the following parameters: contact angle, wettability, and work of adhesion, all agreed that VE_5% MEPECO is the optimal blend.