Product Name
Boric anhydride
Category
Nanoparticles & Nanopowders
Synonyms
Boric anhydride, 99.98% trace metals basis; JKWMSGQKBLHBQQ-UHFFFAOYSA-N; Diboron trioxide; Boric anhydride, purum p.a., >=97.0% (T); CHEBI:30163; boron(III) oxide; Boric anhydride, puriss. p.a., >=98% (T); AKOS015903863; FT-0694863; Boric anhydride, Vetec(TM) reagent grade, 98%;
IUPAC Name
oxo(oxoboranyloxy)borane;
Molecular Weight
69.617g/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;
Melting Point
842 ° F (NIOSH, 2016);450 deg 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 deg C;2.77 g/100 g water at 20 deg C.;Solubility in water, g/l at 25 °C: 36 (moderate);3%;
Application
Boron oxide was used as the intermediate glass layer at a bonding temperature of 450°C. In preparation of fluxes; component of enamels and glass; catalyst in organic reaction.
In metallurgy; in analysis of silicates to determine SiO2 and alkalies; in blowpipe analysis.
Storage
Store at room temperature.
Color/Form
Colorless, brittle, vitreous, semitransparent lumps or hard, white crystals;Colorless, glassy or hexagonal crystals, hygroscopic;Colorless powder or vitreous crystals;
Corrosivity
Very corrosive to metals in the presence of oxygen;
Covalently-Bonded Unit Count
1
Monoisotopic Mass
70.003g/mol
Other Experimental
Enthalpy of fusion: 24.56 kJ/mol at 450 deg C;Standard enthalpy of formation: -1273.5 kJ/mol (crystal); -843.8 kJ/mol (gas); molar heat capacity at 25 deg 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 deg C 1.1 g/100 cu cm, at 100 deg C 15.7 g/100 cu cm; sol in acid, alcohol. Index of refraction: 1.485; MP: approx 450 deg C; Density: 1.812 at 25 deg C at 4 deg C /oxide glass/;Heat of vaporization: 390.4 kJ/mol at 1500 K; 431.4 kJ/mol at 298 K; boiling point: 2316 deg C (extrapolated); viscosity: 10.60 cP at 350 deg C; 4.96 cP at 700 deg C; 4.00 at 1000 deg C; density: 1.8766 g/mL at 0 deg C; 1.844 g/mL at 18-25 deg C; 1.81 g/mL at 18-25 deg C (well-annealed); 1.648 g/mL at 500 deg C (quenched); 1.528 g/mL at 1000 deg C (quenched); index of refraction: 1.463 at 14.4 deg 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/;
pH
pH = 5.1 at 20 deg C 1.0% solution;
Physical Description
BORON OXIDE is a 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.;
Topological Polar Surface Area
43.4A^2
Vapor Pressure
0 mm Hg (approx) (NIOSH, 2016);Negligible at 20 deg C;0 mmHg (approx);0 mmHg (approx);
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