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15678

Sigma-Aldrich

Boric anhydride

puriss. p.a., ≥98% (T)

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Synonym(s):
Boron trioxide
Empirical Formula (Hill Notation):
B2O3
CAS Number:
Molecular Weight:
69.62
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

vapor density

>1 (vs air)

Quality Level

grade

puriss. p.a.

Assay

≥98% (T)

form

solid

loss

≤3% loss on ignition, 900 °C

mp

450 °C (lit.)

density

2.46 g/mL at 25 °C (lit.)

anion traces

chloride (Cl-): ≤20 mg/kg
sulfate (SO42-): ≤50 mg/kg

cation traces

Ag: ≤5 mg/kg
Al: ≤50 mg/kg
Ba: ≤5 mg/kg
Bi: ≤5 mg/kg
Ca: ≤10 mg/kg
Cd: ≤5 mg/kg
Co: ≤5 mg/kg
Cr: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤5 mg/kg
K: ≤30 mg/kg
Mg: ≤20 mg/kg
Mn: ≤5 mg/kg
Mo: ≤5 mg/kg
Na: ≤200 mg/kg
Ni: ≤5 mg/kg
Pb: ≤30 mg/kg
Sr: ≤5 mg/kg
Tl: ≤10 mg/kg
Zn: ≤5 mg/kg

SMILES string

O=BOB=O

InChI

1S/B2O3/c3-1-5-2-4

InChI key

JKWMSGQKBLHBQQ-UHFFFAOYSA-N

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This Item
11615339075202851
Boric anhydride puriss. p.a., ≥98% (T)

Sigma-Aldrich

15678

Boric anhydride

Boric anhydride granulated, ≥98.0% (T)

Sigma-Aldrich

11615

Boric anhydride

Boric anhydride 99.98% trace metals basis

Supelco

339075

Boric anhydride

Boric anhydride 99.999% trace metals basis

Sigma-Aldrich

202851

Boric anhydride

assay

≥98% (T)

assay

≥98.0% (T), 98.0-102.0% (titration)

assay

99.98% trace metals basis

assay

99.999% trace metals basis

form

solid

form

solid

form

powder

form

crystals or chunks

mp

450 °C (lit.)

mp

450 °C (lit.)

mp

450 °C (lit.)

mp

450 °C (lit.)

density

2.46 g/mL at 25 °C (lit.)

density

2.46 g/mL at 25 °C (lit.)

density

2.46 g/mL at 25 °C (lit.)

density

2.46 g/mL at 25 °C (lit.)

anion traces

chloride (Cl-): ≤20 mg/kg, sulfate (SO42-): ≤50 mg/kg

anion traces

-

anion traces

-

anion traces

-

General description

Boric anhydride (Boron trioxide) is a colorless glassy hygroscopic mass having rhombic crystals. Its dissolution in water is a highly exothermic reaction and orthoboric acid is formed. It can be prepared by heating boric acid. It is used as flux in metallurgical processes. It has been reported as an inhibitor of crystallization.

Application

Boric anhydride can be used as a boron precursor to synthesize:
  • Boron carbon nitride nanosheet (BCN) by thermal condensation reaction with urea and melamine.
  • Boron-doped reduced graphene oxide (B-rGO) via a chemical vapor deposition method.
It can also be used as an additive along with pinacol to synthesize 4-alkoxy-5-hydroxy-2-pentenoate derivatives by Pd-catalyzed reaction of α, β-unsaturated γ, δ-epoxy esters with various alcohols.

Other Notes

Reagent for the decomposition of silicates by fusion

Pictograms

Health hazard

Signal Word

Danger

Hazard Statements

Hazard Classifications

Repr. 1B

Storage Class Code

6.1D - Non-combustible, acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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