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| 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 (pKa) | 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, εr, 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 infobox | |
Boron oxide is an odourless, colourless or white solid, also known as diboron trioxide, formula B2O3.
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
- * US NIH hazard information
External links
Boron compounds | Oxides | Acid anhydrides | Inorganic compounds
"Boron trioxide"