The Seger equation is a method used in ceramics to calculate the proportions of materials in a glaze or clay body to achieve desired properties after firing. It focuses on the behavior of clays and minerals during the firing process, helping potters and ceramicists formulate their mixes effectively. The equation considers the balance of fluxes, alumina, and silica in the materials. Resources like Digital Fire provide guidance on using the Seger equation for formulation. Understanding this equation is essential for optimizing ceramic materials for specific firing conditions.