Table 1. SMC formulation. No. Raw materials Parts by weight 1 Unsaturated polyester (UP) resin 60 2 Low profile (shrink) additive 40 3 Peroxide 4 Fillers (CaCO3 or Al(OH)3 powder) 5 Release agent (Zinc Stearate) 6 Magnesium oxide paste (35% MgO) 7 Glass fibers yarn 1.5 150 4 2 25% of total formulation