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%

Application

Boron Trioxide serves multiple essential purposes across various industries due to its unique chemical properties. It is primarily utilized as a noncombustible agent in the formation of glass and enamel components, acting as an intermediate binding layer at high temperatures, such as 450°C. Moreover, Boron Trioxide is an important catalyst in organic reactions, owing to its stable molecular structure, while also playing a critical role in metallurgical processes. It assists in the analysis of silicates, aiding in the determination of silicon dioxide and alkali content, and is also used in blowpipe analysis. Its significance extends to serving as a reagent in laboratories, thereby making it a versatile and indispensable material in industrial and scientific applications.

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)

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