CAS 7647-17-8 appears in our catalog under these names: Cesium chloride, 99.9% (metals basis) , Cesium chloride, 99.999% (metals basis) , Cesium chloride, ultra dry, 99.9% (metals basis) , Cesium chloride, ultra dry, 99.998% (metals basis) , Cesium chloride, ultra dry, 99.99% (metals basis) . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 25g, 100g, 10g, 50g, 5g, 250g.