| Identification | More | [Name]
Boron oxide | [CAS]
1303-86-2 | [Synonyms]
BORIC ACID
BORIC ACID-ANHYDRIDE
BORIC ACID, ANHYDROUS
BORIC ANHYDRIDE
BORIC OXIDE
BORON (III) TRI-OXIDE
BORON OXIDE
BORON TRIOXIDE
DI-BORON TRIOXIDE
ORTHOBORIC ACID
B2O3
B-O
Boria
boricacid(hbo2),anhydride
boricoxide(b2o3)
Boron oxide (B2O3)
Boron sesquioxide
boronoxide(b2o3)
boronsesquioxide
caswellno.109b | [EINECS(EC#)]
215-125-8 | [Molecular Formula]
BHO | [MDL Number]
MFCD00011315 | [Molecular Weight]
27.82 | [MOL File]
1303-86-2.mol |
| Chemical Properties | Back Directory | [Appearance]
Boron oxide is a noncombustible, colorless,
semitransparent lumps or hard, white, odorless crystals, with
slightly bitter taste. | [Melting point ]
450 °C(lit.)
| [Boiling point ]
1860 °C
| [density ]
2.46 g/mL at 25 °C(lit.)
| [vapor density ]
>1 (vs air)
| [vapor pressure ]
1Pa | [Fp ]
1860°C | [storage temp. ]
Inert atmosphere,Room Temperature | [solubility ]
36g/l | [form ]
pellets
| [color ]
White | [Specific Gravity]
2.46 +/- 0.01 | [Odor]
Odorless | [PH]
4 (10g/l, H2O, 25℃) | [Stability:]
Stable. Moisture sensitive. Incompatible with water. | [Water Solubility ]
36 g/L (25 ºC) | [Sensitive ]
Hygroscopic | [Merck ]
14,1337 | [Exposure limits]
ACGIH: TWA 10 mg/m3
OSHA: TWA 15 mg/m3
NIOSH: IDLH 2000 mg/m3; TWA 10 mg/m3 | [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]
1303-86-2(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
Xi | [Risk Statements ]
R36/37/38:Irritating to eyes, respiratory system and skin . | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S37/39:Wear suitable gloves and eye/face protection . | [WGK Germany ]
1
| [RTECS ]
ED7900000
| [F ]
3-10 | [TSCA ]
Yes | [HS Code ]
28100010 | [Hazardous Substances Data]
1303-86-2(Hazardous Substances Data) | [Toxicity]
LD50 orally in Rabbit: 3150 mg/kg | [IDLA]
2,000 mg/m3 |
| Hazard Information | Back Directory | [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.
| [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. | [First aid]
If this chemical gets into the eyes, remove any
contact lenses at once and irrigate immediately for at
least 15 minutes, occasionally lifting upper and lower
lids. Seek medical attention immediately. If this chemical
contacts the skin, remove contaminated clothing and
wash immediately with soap and water. Seek medical
attention immediately. If this chemical has been inhaled,
remove from exposure, begin rescue breathing (using
universal precautions, including resuscitation mask) if
breathing has stopped and CPR if heart action has
stopped. Transfer promptly to a medical facility. When
this chemical has been swallowed, get medical attention.
Boron Oxide 455
Give large quantities of water and induce vomiting. Do
not make an unconscious person vomit. | [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. | [Description]
Boron oxide is a noncombustible, colorless,semitransparent lumps or hard, white, odorless crystals,with slightly bitter taste. Molecular weight=69.64; Boilingpoint=about 1860℃; Freezing/Melting point=about450℃. Hazard Identification (based on NFPA-704 MRating System): Health 2, Flammability 0, Reactivity 0.Moderately soluble in water; solubility=(moderate) 3%;slow reaction. | [Chemical Properties]
Boron oxide is a noncombustible, colorless, semitransparent lumps or hard, white, odorless crystals, with slightly bitter taste.
| [Chemical Properties]
white powder or glassy flakes | [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.
| [Uses]
In preparation of fluxes; component of
enamels and glass; catalyst in organic reaction | [Definition]
ChEBI: Diboron trioxide is a boron oxide with formula B2O3. | [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. | [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. | [Biochem/physiol Actions]
Boric anhydride is an oxide of boron that shows antimicrobial property along with lower aminoalcohols. | [storage]
Color Code—Green: General storage may be used.Store in tightly closed containers in a dry, well-ventilatedarea away from incompatible materials listed above andwater. |
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