Cesium sulfate (Cs₂SO₄) is a specialty chemical used primarily in analytical chemistry as a source of cesium ions for flame photometry, atomic absorption spectroscopy, and other instrumental methods. It is employed in the preparation of cesium-based catalysts for organic synthesis and polymerization reactions. Due to its high solubility and thermal stability, it finds applications in the manufacture of specialty glasses and ceramics to modify refractive indices and reduce dispersion. Additionally, it is utilized in research for isotope separation techniques and nuclear chemistry studies, taking advantage of the unique isotopic properties of cesium.