Boron trioxide

Encyclopedia : B : BO : BOR : Boron trioxide

>
Boron trioxide

General
Other names Diboron trioxide,
Boric acid,
Boric oxide.
Molecular formula B₂O₃.
Molar mass 69.6182 g/mol
Appearance Colorless, glassy solid.
CAS number
EINECS number 2151258
Properties
Density and phase 2.460 g.cm^-3, liquid
Solubility in water Soluble
Solubility in alcohol N/A
Solubility in ether N/A
Melting point 450°C
Boiling point 1860°C
Acidity (pK_a) N/A
Structure
Molecular shape N/A
Dipole moment N/A
Hazards
MSDS External MSDS
EU classification N/A
R-phrases N/A
S-phrases N/A
PEL (US, OSHA) N/A
IDLH (US, NIOSH) N/A
Flash point N/A
Autoignition temperature N/A
Explosive limits in air N/A
RTECS number N/A
Supplementary data page
Structure & properties n, ε_r, etc.
Thermodynamic data Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Related compounds
Other anions None
Other cations None
Related compounds None
Except where noted otherwise, data are given for
materials in their standard state (at 25°C, 100 kPa)
[Chemical infoboxInfobox disclaimer and references]

Boron trioxide

General
Other names	Diboron trioxide, Boric acid, Boric oxide.
Molecular formula	B₂O₃.
Molar mass	69.6182 g/mol
Appearance	Colorless, glassy solid.
CAS number
EINECS number	2151258
Properties
Density and phase	2.460 g.cm^-3, liquid
Solubility in water	Soluble
Solubility in alcohol	N/A
Solubility in ether	N/A
Melting point	450°C
Boiling point	1860°C
Acidity (pK_a)	N/A
Structure
Molecular shape	N/A
Dipole moment	N/A
Hazards
MSDS	External MSDS
EU classification	N/A
R-phrases	N/A
S-phrases	N/A
PEL (US, OSHA)	N/A
IDLH (US, NIOSH)	N/A
Flash point	N/A
Autoignition temperature	N/A
Explosive limits in air	N/A
RTECS number	N/A
Supplementary data page
Structure & properties	n, ε_r, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Related compounds
Other anions	None
Other cations	None
Related compounds	None
Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa) [Chemical infoboxInfobox disclaimer and references]

Boron oxide is an odourless, colourless or white solid, also known as diboron trioxide, formula B₂O₃.

Contents

1 Applications
2 Average Daily Intake
3 Hazard Information
4 External links

Applications

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)

Average Daily Intake

The US National Institute of Health quotes this source:

Total daily boron intake in normal human diets ranges from 2.1-4.3 mg boron/kg body weight (bw)/day. /Total boron/ Zook EG and Lehman J; J. Assoc. Off Agric. Chem. 48: 850-5 (1965)

Hazard Information

[Australian Government information]
[link] US NIH hazard information

External links

[National Pollutant Inventory - Boron and compounds]

For a full list of external links to MSDSs, spectroscopic data, commercial chemicals suppliers etc. for this compound, see [Chemical sources].

From Wikipedia, the Free Encyclopedia. Original article here. Support Wikipedia by contributing or donating.
All text is available under the terms of the GNU Free Documentation License See Wikipedia Copyrights for details.