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Boron oxide

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Boron oxide Basic information

Product Name:
Boron oxide
CAS:
1303-86-2
MF:
B2O3
MW:
69.62
EINECS:
215-125-8
Mol File:
1303-86-2.mol
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Boron oxide Chemical Properties

Melting point:
450 °C(lit.)
Boiling point:
1860 °C
Density 
2.46 g/mL at 25 °C(lit.)
vapor density 
>1 (vs air)
Flash point:
1860°C
storage temp. 
Store at room temperature.
solubility 
36g/l
form 
pellets
color 
White
Specific Gravity
2.46 +/- 0.01
Odor
Odorless
PH
4 (10g/l, H2O, 25℃)
Water Solubility 
36 g/L (25 ºC)
Sensitive 
Hygroscopic
Merck 
14,1337
Stability:
Stable. Moisture sensitive. Incompatible with water.
InChIKey
JKWMSGQKBLHBQQ-UHFFFAOYSA-N
CAS DataBase Reference
1303-86-2(CAS DataBase Reference)
NIST Chemistry Reference
Diboron trioxide(1303-86-2)
EPA Substance Registry System
Boric oxide (1303-86-2)
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Safety Information

Hazard Codes 
Xi,T
Risk Statements 
36/37/38-61-60
Safety Statements 
26-37/39-45-53
WGK Germany 
1
RTECS 
ED7900000
3-10
TSCA 
Yes
HS Code 
28100010
Hazardous Substances Data
1303-86-2(Hazardous Substances Data)
Toxicity
LD50 orally in Rabbit: 3150 mg/kg

MSDS

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Boron oxide Usage And Synthesis

Chemical Properties

white powder or glassy flakes

Chemical Properties

Boron oxide is a noncombustible, colorless, semitransparent lumps or hard, white, odorless crystals, with slightly bitter taste.
Boron oxide

Physical properties

Colorless glassy solid or vitreous crystal; hexagonal crystal system; slightly bitter taste; hygroscopic; density 2.55 g/cm3; melts at 450°C; vaporizes at 1,500°C; slightly soluble in cold water (3.3%), soluble in alcohol and boiling water (20%).

Uses

A saturated solution of H3BO3 contains about 2% of the compound at 0 C, increasing to about 39% at 100 C. The compound also is soluble in alcohol. In preparations, solutions of boric acid are nonirritating and slightly astringent with antiseptic properties. Although no longer used as a preservative for meats, boric acid finds extensive use in mouthwashes, nasal sprays, and eye-hygiene formulations. Boric acid (sometimes with borax) is used as a fire-retardant. A commercial preparation of this type (Minalith) consists of diammonium phosphate, ammonium sulfate, sodium tetraborate, and boric acid. The tanning industry uses boric acid in the deliming of skins where calcium borates, soluble in H2O, are formed. As sold commercially, boric acid is B3O3·3H2O, prepared by adding HCl or H2SO4 to a solution of borax.

Uses

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.

Preparation

Boric oxide is produced by treating borax with sulfuric acid in a fusion furnace. At temperatures above 750°C, the molten boric acid layer separates out from sodium sulfate. It then is decanted, cooled, and obtained in 96-97% purity. Boric acid above 99% purity may be obtained by fusing granular material.
Boric oxide may be prepared by heating boric acid.
2B(OH)3 → B2O3 + 3H2O

Production Methods

Boric oxide is produced by thermal fusion of boric acid, forming a clear transparent glass-like solid that is subsequently ground into white vitreous granules. It is used principally in the manufacture of glass and vitreous products.

General Description

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.

Reactivity Profile

Boron oxide is non-combustible. Of generally low chemical reactivity. Reacts exothermically but slowly with water to form boric acid, a weak acid. Reacts exothermically with strong bases. May react with strong reducing agents such as metal hydrides, metal alkyls to generate flammable or explosive gases. May react violently on contact with bromine pentafluoride. Corrosive to metals in the presence of air.

Hazard

Eye and upper respiratory tract irritant.

Health Hazard

Boron oxide is an eye and respiratory irritant. In 113 workers exposed to boron oxide and boric acid dusts, there were statistically significant increases in symptoms of eye irrita- tion; dryness of the mouth, nose, and throat; sore throat; and productive cough compared with controls. The mean exposure level was 4.1mg/m3 , with a range of 1.2–8.5mg/m3 . Exposures may occasionally have exceeded 10 mg/m3 . Because of mixed exposures, the study does not indicate whether boron oxide or boric acid dust is more important in causing symp- toms, nor does it indicate the minimum duration of exposure necessary to produce symptoms.
Excessive absorption of boron oxide may lead to cardiovascular collapse, alterations in temperature regulation, and coma.

Potential Exposure

Boron oxide is used in glass manufacture and the production of other boron compounds. It is used in fluxes, enamels, drying agents, and as a catalyst.

Shipping

UN3077 Environmentally hazardous substances, solid, n.o.s., Hazard class: 9; Labels: 9—Miscellaneous hazardous material, Technical Name Required.

Incompatibilities

Incompatible with bromine pentafluoride, calcium oxide. Reacts slowly with water, forming boric acid. Reacts exothermically with alkaline material and strong bases. May react with strong reducing agents such as metal hydrides, metal alkyls to generate flammable or explosive gases. May react violently on contact with bromine pentafluoride. Corrosive to metals in the presence of air.

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Boron oxideSupplierMore

Shanghai Yongzhi chemical-Technology Co., Ltd. Gold
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021-60944093 18516153908 13917602471
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Shanghai He Huan Chemical Co., Ltd. Gold
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Shenzhen Hongyuan Import and Export Trade Co., Ltd. Gold
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J & K SCIENTIFIC LTD.
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010-82848833- ;010-82848833-
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jkinfo@jkchemical.com;market6@jkchemical.com
Meryer (Shanghai) Chemical Technology Co., Ltd.
Tel:
21-61259100-
Email:
sh@meryer.com
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