C 6826 (OTTO) Cesium chloride anhydrous, beads, −10 mesh, 99.99% Cas no 7647-17-8 - used for the preparation of electrically conducting glasses. C 6826 (OTTO) Cesium chloride anhydrous, beads, −10 mesh, 99.99% Cas no 7647-17-8 - used to make solutions for the separation of RNA from DNA by density gradient centrifugation.