Characteristic

 

Boron trioxide (or diboron trioxide) is one of the oxides of boron. It is a white, glassy solid with the formula B₂O₃. It is almost always found as the vitreous (amorphous) form.

Chemical formula：B₂O₃

Molar mass：69.6182 g/mol

Appearance：white, glassy solid

Density：2.460 g/cm³, liquid;2.55 g/cm³, trigonal;3.11–3.146 g/cm³, monoclinic

Melting point：450 °C (842 °F; 723 K) (trigonal);510 °C (tetrahedral)

Boiling point：1,860 °C (3,380 °F; 2,130 K) , sublimes at 1500 °C

Solubility in water：1.1 g/100mL (10 °C);3.3 g/100mL (20 °C);15.7 100 g/100mL (100 °C)

Solubility：partially soluble in methanol

 

Application

 

Fluxing agent for glass and enamels

Starting material for synthesizing other boron compounds such as boron carbide

An additive used in glass fibres (optical fibres)

Component used in the production of borosilicate glass

The inert capping layer in the Liquid Encapsulation Czochralski process for the production of gallium arsenide single crystal

As an acid catalyst in organic synthesis

B2O3_MSDS.pdf