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To simplify the complex electromagnetic casting (EMC) techniques, a simulated experimental setup has been designed. With this apparatus, the contraction of the lateral faces of pure aluminum and Al±4.5%Cu slabs, which are different in width-over-thickness ratio, pouring temperature or cooling water¯ow rate was recorded during the casting process. The cross-section deformation of cold slabs was also measured. The greatest contraction was found to have occurred before the complete solidi®cation of the ingot cross-section. It was concluded that the contraction of the lateral faces is due mainly to the bending of solid shell induced by the thermal stresses. The surface temperature of the ingots is the critical factor in¯uencing the unevenness of the contraction of the cross-section. q