CAS 1634-04-4 appears in our catalog under these names: tert-Butyl methyl ether, HPLC Grade, 99+% , tert-Butyl methyl ether, HPLC grade, 99+%, packaged under Ar, tert-Butyl methyl ether, 99% . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 1L, *4x1L, 250ml, 2500ml, 500ml, 1000ml.