CAS 7789-17-5 appears in our catalog under these names: Cesium Iodide, 3N/4N, Cesium iodide, 99.9% (metals basis) , Cesium iodide, 99.999% (metals basis) , Cesium iodide, ultra dry, 99.998% (metals basis) . Offered by: Chemat Brand, Thermo Scientific (Alfa Aesar). Available pack sizes: on request, 25g, 100g, 1g, 10g, 50g, 250g.