Formula: Na₂B₄O₇·10H₂O CAS: 1303-96-4 EC No.: 215-540-4 M (Molar Mass): 381.37 g/mol D (Density): 1.73 g/cm³ mp (Melting Point): 75°C (loses water) bp (Boiling Point): 320°C (anhydrous) Optical Rotation: Not applicable

Assay (Acidimetric as Na₂B₄O₇·10H₂O): ≥ 99.0 % Appearance: White crystalline powder or granules. Identification (Sodium, Borate): Passes test. pH (1% solution): 9.2 - 9.4 Chloride (Cl): ≤ 0.005 % Sulfate (SO₄): ≤ 0.01 % Heavy Metals (as Pb): ≤ 10 ppm Iron (Fe): ≤ 10 ppm Loss on Drying (at 150°C): 46.0 - 48.0 % (corresponds to 10 H₂O)