Boron Trioxide - Materials / Alfa Chemistry

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Boron Trioxide

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Catalog Number

ACMA00014306

Product Name

Boron Trioxide

Category

Glass Additives

Description

Boron oxide appears as colorless, semi-transparent glassy lumps or hard white odorless crystals. Mp 450°C; bp: 1860°C. Density: 2.46 g cm-3. Moderately soluble in water. Used as an insecticide; as the starting material for the synthesis of other boron compounds; as a fluxing agent in enamels and glasses; and in mixture with 2-6% boron nitride, as a bonding agent in the hot isostatic pressing of boron nitride ceramics.;DryPowder; DryPowder, PelletsLargeCrystals; PelletsLargeCrystals;WHITE HYGROSCOPIC POWDER OR GRANULES;Colorless, semitransparent lumps or hard, white, odorless crystals.;Colorless, semitransparent lumps or hard, white, odorless crystals.

IUPAC Name

oxo(oxoboranyloxy)borane

Molecular Weight

69.63g/mol

Molecular Formula

B2O3;B2O3;B2O3

Canonical SMILES

B(=O)OB=O

InChI

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

InChI Key

JKWMSGQKBLHBQQ-UHFFFAOYSA-N

Boiling Point

3380 °F at 760 mm Hg (NIOSH, 2016);1500 °C (crystal);~1860 °C;3380°F;3380°F

Melting Point

842 °F (NIOSH, 2016);450 °C (crystal);450 °C;842°F;842°F

Density

2.46 (NIOSH, 2016);1.8 g/cu cm (amorphous); 2.46 g/cu cm (crystal);Relative density (water = 1): 2.46 (cryst);2.46;2.46

Solubility

3 % (NIOSH, 2016);Slowly soluble in 30 parts cold water; slowly soluble in 5 parts boiling water; soluble in alcohol, glycerol;Water solubility: 4.0% at 20 °C;2.77 g/100 g water at 20 °C.;Solubility in water, g/l at 25 °C: 36 (moderate);3%

Color/Form

Colorless, brittle, vitreous, semitransparent lumps or hard, white crystals;Colorless, glassy or hexagonal crystals, hygroscopic;Colorless powder or vitreous crystals

Complexity

34.2

Corrosivity

Very corrosive to metals in the presence of oxygen

Covalently-Bonded Unit Count

EC Number

215-125-8

Exact Mass

70.003354g/mol

Formal Charge

Heavy Atom Count

ICSC Number

0836

MeSH Entry Terms

B2O3;B2O5;BO2;boron oxide;boron oxide, mono-oxide

Monoisotopic Mass

70.003354g/mol

Odor

Odorless

Other Experimental

Enthalpy of fusion: 24.56 kJ/mol at 450 °C;Standard enthalpy of formation: -1273.5 kJ/mol (crystal); -843.8 kJ/mol (gas); molar heat capacity at 25 °C: 62.8 J/K mol (crystal); 66.9 J/K mol (gas);Mohs' hardness: 4; mildly hygroscopic at room temperature; reaction with water is exothermic, -75.94 kJ/mol;Slowly reacts with water to form boric acid;Colorless, vitreous crystals; solubility: in water at 0 °C 1.1 g/100 cu cm, at 100 °C 15.7 g/100 cu cm; sol in acid, alcohol. Index of refraction: 1.485; MP: approx 450 °C; Density: 1.812 at 25 °C at 4 °C /oxide glass/;Heat of vaporization: 390.4 kJ/mol at 1500 K; 431.4 kJ/mol at 298 K; boiling point: 2316 °C (extrapolated); viscosity: 10.60 cP at 350 °C; 4.96 cP at 700 °C; 4.00 at 1000 °C; density: 1.8766 g/mL at 0 °C; 1.844 g/mL at 18-25 °C; 1.81 g/mL at 18-25 °C (well-annealed); 1.648 g/mL at 500 °C (quenched); 1.528 g/mL at 1000 °C (quenched); index of refraction: 1.463 at 14.4 °C; specific heat capacity: 62.969 J/kg K at 298 K; heat of formation: -1252.2 kJ at 298.15 K /Vitreous boric oxide/

Refractive Index

INDEX OF REFRACTION: 1.61

Rotatable Bond Count

RTECS Number

ED7900000

Stability

Keep dry

Vapor Pressure

0 mm Hg (approx) (NIOSH, 2016);Negligible at 20 °C;0 mmHg (approx);0 mmHg (approx)

MSDS

Download MSDS

COA