CAS 1304-56-9 appears in our catalog under these names: Beryllium oxide/ 98+% (EVE/EUD), Beryllium oxide, 99% (metals basis) , Beryllium oxide, 99.95% (metals basis) , BERYLLIUM OXIDE, 99.98%. Offered by: Chemat, Thermo Scientific (Alfa Aesar), Sigma-Aldrich. Available pack sizes: 25g, 5g, 100G.