The purpose of this research was to analyze sand inclusion defects using SEM/EDS. For this, foundry sand was dipped in molten metal and SEM/EDS data was used for comparison. In the green sand of SEM/EDS data for comparison, the surface was porous. Sand particles also showed the tendency to melt easily. The core sand showed the tendency for smooth surface did not melt eastly compared with green sand. Data of new sand, reclaimed sand, refractory sand, and ladle slag, etc. was gathered as SEM/EDS data for comparison. Sand inclusion defects which at casting factories were analyzed using the SEM/EDS data for comparison. The results confirmed that the causes can be determined.
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