CAS 1305-78-8 appears in our catalog under these names: Calcium oxide, Puratronic½, 99.998% (metals basis, excludin , Calcium oxide, 99.95% (metals basis) , #alcium oxide, Reagent Grade . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 2g, 10g, 50g, 250g, 1kg, 500g, 2kg.