CAS 7681-38-1 appears in our catalog under these names: Sodium Hydrogen Sulfate, Sodium hydrogen sulfate/ 99.99%, Sodium hydrogen sulfate, anhydrous, 90+%, remainder mainly s, Sodium bisulfate, 92%, technical, Sodium hydrogen sulfate, fused, 90.00%. Offered by: TRC, Chemat, Thermo Scientific (Alfa Aesar), Thermo Scientific (Acros), Sigma-Aldrich. Available pack sizes: 10g, 1g, 5g, 50g, 1000g, 5000g, 250g, 1KG.