Boric acid (H₃BO₃)

Compound

56.30% B₂O₃, 43.70% H₂O

Molecular weight

61.84

Density

1.435 g/cm³

Molten

800 - 815 kg/m³

Melting point

171˚C

Borax (Na₂B₄O₇∙5H₂O)

Compound

21.28% Na₂O, 47.80% B₂O₃, 30.92% H₂O

Molecular weight

291.35

Density

1.815 g/cm³

Molten

2.980 kg/m³

Melting point

741˚C