Cesium sulfate (CAS 10294-54-9) has a chemical formula of Cs₂SO₄, a molecular weight of 361.87, and a melting point of 1019 °C. Characterized by odorless crystals, it is non-hygroscopic under normal conditions—an advantageous property for storage and transportation. Unlike many other cesium salts, Cs₂SO₄ boasts exceptional stability, making it suitable for ordinary freight as long as it is kept dry. With a density of 4.243 g/mL, this compound is nearly twice as heavy as common sulfates, a key attribute that renders it indispensable in density-gradient separation processes.