Used in analytical chemistry for the determination of sulfur in organic and inorganic samples through gravimetric analysis. It serves as a precipitating agent due to the low solubility of certain cesium salts, enabling separation and quantification of specific ions. Also employed in specialized electrochemical applications and as a component in some high-density aqueous solutions for density gradient centrifugation. Its high molecular weight and ionic properties make it suitable for use in certain types of sensors and solid electrolytes in research settings.