di-Sodium tetraborate anhydrous, min. 99 %, extra pure, Molar mass (M) 201,22 g/mol, Density (D) 2,354 g/cm³, Boiling point (bp) 1575 °C, CAS No. [1330-43-4], EG-Nr. 215-540-4, Empirical formula Na2B4O7