<p>  This study investigated the relationship between the type of cavities that occur in CE meter shell cups and the thermal analysis properties of spheroidal graphite cast iron molten metal.</p><p>  The cavities in shell cups were classified into three types : gas hole type cavity, massive type shrinkage cavity, and dispersion type shrinkage cavity. The timing of the occurrence of cavities was estimated from the diffusion of C around the holes. Results of the experiments revealed a high correlation between EGA (Eutectic Graphite Ability) and number of graphite grains. In addition, most of the samples with a large number of graphite grains showed gas hole cavity, and most of the samples with a small number of graphite grains showed dispersion type shrinkage cavity. Assuming that the occurrence of shrinkage cavity is determined by two factors : the amount of released gas that could no longer be dissolved and the negative pressure generated inside the casting, gas hole cavities can also be considered as a type of shrinkage cavity.</p><p>  As the pouring temperature (initial temperature T₀) increased, the shrinkage tendency θ (thermal conductivity near the thermocouple) became smaller and the solidification ending temperature T_s increased. Since pouring temperature affects thermal analysis parameters, it was assumed that the test must be performed at a constant pouring temperature or thermal analysis parameters must be adjusted according to the pouring temperature in the thermal analysis using a CE meter. As the number of graphite grains increased, the ratio of second half eutectic solidification time R_she (＝ (t_{T_S}－t_{T_EM}) / (t_{T_S}－T_{T_SC})), which is obtained by dividing the second half eutectic solidification time by the total eutectic solidification time, increased and shrinkage tendency θ decreased. This indicates that the thermal conductivity near the thermocouple increased as the ratio of second half eutectic solidification time R_she increased. These findings suggest that the ratio of second half eutectic solidification time R_she, which indicates the amount of graphite crystallized in the second half of eutectic solidification, is important in the analysis of molten metal properties.</p>