(a) Final temperature of the cordierite and bare copper using Set A. Results of copper sheets covered by thicker cordierite and thinner cordierite are shown. (b) Comparison chart of temperature reduction effect of cordierite-covered copper sheet and pure copper sheet using Set B. (c) Comparison chart of temperature reduction effect of cordierite-covered steel sheet and pure steel sheet using Set B. (d) Reduced cooling time by covering cordierite of panels (b) and (c).