C 1827 (OTTO) Cesium sulphate, GR 99.5% Cas 10294-54-9 - used to prepare dense aqueous solutions for use in isopycnic (or "density-gradient") centrifugation. C 1827 (OTTO) Cesium sulphate, GR 99.5% Cas 10294-54-9 - used to prepare dense aqueous solutions, which finds application in isopycnic centrifugation especially for DNA purification and recovery.