The document summarizes a project presentation on mathematical modeling and experimental determination of grade intermixing time in a single strand slab casting tundish. Key points: - Experiments were conducted on a scaled-down physical model of an industrial tundish to measure grade intermixing time under different operating parameters. - Over 150 experiments were performed under 50 different conditions by varying residual volume, inflow rate, and outflow rate. - Results show grade intermixing time decreases with decreasing residual volume and increasing outflow rate. It depends least on inflow rate. - Dimensional analysis and regression analysis are being used to develop a mathematical correlation between grade intermixing time and the operating parameters.