Boric acid, 99.995%, Certified® Ultrapure ACS 10g

CERTIFICATE OF ANALYSIS

• Cat 2331392-CUA4N5   10 GM   Lot USB-76324-110576
• Certified® Ultrapure ACS
• 100.3% 
• CAS 10043-35-3

• Appearance white crystalline powder
• Arsenic (As) <1ppm
• Assay (alkalimetric) 100.3%
• Boiling point 300°C
• Calcium (Ca) <0.005%
• Chloride (Cl) <0.001%
• Density 1.435
• Heavy metals (as Pb) <0.001%
• Identification passes
• Insoluble in methanol <0.005%
• Iron (Fe) <0.001%
• Melting point 170.9°C  
• Molecular formula BH₃O₃  
• Molecular weight 61.83
• Non-volatile with methanol <0.5%
• Phosphate (PO₄) <0.001%
• Refractive index 1.385
• Solubility in methanol, ethanol, slightly in acetone, increases rapidly with temperature in water
• Sulfate (SO₄) <0.01%
• Retest 12/2026