Abstract: Physical properties and impact breakage functions for a « Shaba » variety hybrid of maize kernel was estimated. About the investigation of impact breakage functions, a new modified manual version of a JK Tech drop-weight test device was used. The purpose of this research is to investigate the effect of specific comminution energy (Ecs) on impact breakage distributions. The main results in this study can be summarized as follows : for physical properties of maize kernels : length (L), width (l), and thickness (E) was 12.56, 9.67, and 4.83 mm respectively, the geometric mean diameter (Dg) 8.32 mm, arithmetic diameter (Da) 9.03 mm, equivalent diameter (Dp) 8.72 mm, the percentage of sphericity (Sp) is 66.76 % and the mass of 1000 maize grains is 359.43 gr. For impact breakage distributions, relationship between specific comminution energy and grindability index (t10) was establised. Ecs - t10 model given in the literature was successfully fitted to the single impact breakage test results, the value of constant was respectively A and b. And in the end of this research, t-family curve approach was established to estimate single particle breakage functions of the « Shaba » variety hybrid maize kernel.