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Description:Chemical Name: Sodium Tetraborate Anhydroous Molecular Formula: Na2B4O7 Molecular Weight: 201.22 Physical Character: White crystal glass A Orthorhombic, Melting Point 742.5 degrees centigrade, Density 2.28 B Orthorhombic, Melting Point 664 degrees centigrade, Density 2.75, Intensive moisture absorption, soluble in water, slowly soluble in methanol, and can form the solvent of concentration of 13--16%. Usage: For producing high quality glass, optical glass, have the property of heat resistant. Used as glaze in enamel industry. Also used as the fluxing agent on metal or alloy surface. Specification Sodium Tetraborate Anhydroous% :95~98 min Sodium Oxide% :30 min Boron Trioxide% :66~68 min