CAS 534-17-8 appears in our catalog under these names: Cesium carbonate, 99.9% (metals basis) , Cesium carbonate, 99.99% (metals basis) , Cesium carbonate, Puratronic|r, 99.994% (metals basis) , Cesium carbonate, 99% (metals basis) . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 5g, 25g, 100g, 500g, 10g, 50g, 250g, 1kg.