Sodium Borate Buffer is >99+% and has a buffering capacity of pH 7.4-9.2. CAS Number: 1303-96-4 Linear Formula: Na2B4O7 · 10H2O Molecular Weight: 381.37 g/mol EC Number: 215-540-4 MDL number: MFCD00149193 PubChem Substance ID: 24892161 Alternative Names: Sodium tetraborate decahydrate; Borax decahydrate; Sodium borate decahydrate; Sodium borate [tetra] decahydrate