Boron Trioxide

B₂O₃

IUPAC: Diboron trioxide

CAS: 1303-86-2

Overview

Boron trioxide is a glassy solid that is one of the most important boron compounds. It is a key component of borosilicate glass (Pyrex), which has low thermal expansion and high resistance to thermal shock. It is also used as a flux in metallurgy.

Composition

Element Symbol Atoms Atomic Mass
Boron B 2 10.8100
Oxygen O 3 15.9990

Elemental Composition

B
Boron ×2
31.1%
O
Oxygen ×3
68.9%

Uses

  • • Borosilicate glass (Pyrex) production
  • • Metallurgical flux
  • • Fiberglass production
  • • Flame retardant

Fun Facts

  • ✦ Pyrex glass gets its thermal shock resistance from the addition of boron trioxide

Safety

  • ⚠ Mild skin and eye irritant

Structure

SMILES

B12OB(O1)O2

Properties

Type
oxide
State
solid
Molar Mass
69.62 g/mol
Density
2.4600 g/cm³
Melting Point
450.0 °C
Boiling Point
1860.0 °C
Solubility
22 g/L at 25°C

Molecular Descriptors

Exact Mass
70.0034
TPSA
27.7 Ų
H-Bond Donors
0
H-Bond Acceptors
3
Rotatable Bonds
0
Heavy Atoms
5
Complexity
33.0

Also Known As

Boron oxide Boric oxide

Related Compounds

Aluminum Oxide

Al₂O₃

Antimony Trioxide

Sb₂O₃

Barium Oxide

BaO

Beryllium Oxide

BeO

Bismuth(III) Oxide

Bi₂O₃

Cadmium Oxide

CdO

Calcium Oxide

CaO

Carbon Dioxide

CO₂

Carbon Monoxide

CO

Cerium(IV) Oxide

CeO₂

Frequently Asked Questions

What is Boron Trioxide?
Boron Trioxide (B₂O₃) is a oxide compound with the IUPAC name Diboron trioxide.
What is the molecular weight of Boron Trioxide?
Boron Trioxide has a molar mass of 69.62 g/mol.
What state is Boron Trioxide at room temperature?
Boron Trioxide is a solid at room temperature.
Is Boron Trioxide organic or inorganic?
Boron Trioxide is classified as an inorganic compound.
What elements make up Boron Trioxide?
Boron Trioxide (B₂O₃) is composed of Boron (B), Oxygen (O).