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Borax

Sodium Borate, Sodium Tetraborate, Disodium Tetraborate
Production Information
PROPERTIES
Properties  
Chemical formula Na2B4O7·10H2O or Na2[B4O5(OH)4]·8H2O
Molar mass 381.38 (decahydrate)201.22 (anhydrate)
Density 1.73 g/cm3 (solid)
Melting point 743 °C (1,369 °F; 1,016 K) anhydrate
Boiling point 1,575 °C (2,867 °F; 1,848 K)
 
 
SPECIFICATION
Specification 11S 11
Appearance   Transparent Granules   White, Odourless, Crystalline Solid  
Boron Content (As B)  10.5% Min   10.5% Min  
Na2O 16.25% Typical  16.25% Typical 
Matter Insoluble in Water 1.0% Max 1.0% Max
Bulk Density  0.90 gm/cc 0.812 gms/cc
Particle size: 1.4mm – 5mm  95% Min   
Solubility in Water: (a) At 20°C   4.70%
                               (b) At 100°C   65.64%
pH @ 20°C: (a) pH 0.1% solution   9.3
                    (b) pH 1.0% solution   9.2
Bulk Density (Loose)    
Particle size: (a) +1mm   0.8% Max
                      (b) -0.060mm   4.0% Max