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202851

Sigma-Aldrich

Boric anhydride

99.999% trace metals basis

Synonym(s):
Boron trioxide
Empirical Formula (Hill Notation):
B2O3
CAS Number:
Molecular Weight:
69.62
EC Number:
MDL number:
eCl@ss:
38120103
PubChem Substance ID:

vapor density

>1 (vs air)

Quality Level

assay

99.999% trace metals basis

form

crystals or chunks

reaction suitability

reagent type: catalyst
core: boron

mp

450 °C (lit.)

solubility

ethanol: soluble at 20 °C

density

2.46 g/mL at 25 °C (lit.)

SMILES string

O=BOB=O

InChI

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

InChI key

JKWMSGQKBLHBQQ-UHFFFAOYSA-N

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General description

Anhydride can be obtained by heating boric acid at temperatures higher than 160oC.1

Application

Reducing boron anhydride in the presence of sodium yields amorphous boron. Whereas reducing in the presence of aluminum at high temperatures affords crystalline boron. 1

Packaging

5 g in poly bottle
Packaged in poly bottles

Pictograms

Health hazard

Signal Word

Danger

Hazard Statements

Precautionary 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

Certificate of Analysis

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Certificate of Origin

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