CAS 12032-20-1 appears in our catalog under these names: Lutetium(III) oxide, REacton|r, 99.995% (metals basis), REM , Lutetium(III) oxide, 99.9% (REO) , Lutetium(III) oxide, REacton|r, 99.9% (REO) , Lutetium(III) oxide, REacton|r, 99.99% (REO) . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 1g, 5g, 1g , 25g.