Chinese Japanese Germany Korea
ChemicalBook >> CAS DataBase List >>Boron oxide

Boron oxide

Boron oxide Structure
Boron oxide structure
CAS No.
1303-86-2
Chemical Name:
Boron oxide
Synonyms
B2O3;BORON TRIOXIDE;BORIC ANHYDRIDE;BORIC OXIDE;B-O;boricacid(hbo2),anhydride;Boria;Boron anhydride;Boron sesquioxide;Anhydrous Boric Acid
CBNumber:
CB1264526
Molecular Formula:
B2O3
Lewis structure
b2o3 lewis structure
Molecular Weight:
69.62
MDL Number:
MFCD00011315
MOL File:
1303-86-2.mol
MSDS File:
SDS
TDS File:
TDS
Last updated:2026-08-06 18:30:54
Product description Number Pack Size Price
BOLETH human cell line NOTE: Both the cell line and DNA from the cell line may be available for this product. Please choose CB_88052031 1 unit $436
BOLETH human cell line IHW Number: 9031, 88052031 CB_88052031 1VIAL $610
Boric anhydride puriss. p.a., ≥98% (T) 15678 1kg $584
Boric anhydride granulated, ≥98.0% (T) 11615 1kg $129
di-Boron trioxide 99.9995 Suprapur® 1.00169 150 g $1150
More product size
Request For Quotation

Boron oxide Properties

Melting point 450 °C(lit.)
Boiling point 1860 °C
Density 2.46 g/mL at 25 °C(lit.)
bulk density 900-1100kg/m3
vapor density >1 (vs air)
vapor pressure 1Pa
Flash point 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℃)
biological source human blood
Water Solubility 36 g/L (25 ºC)
Specific Heat Capacity Cp(crystal): 0.9 J/(g·K); Cp(gas): 0.96 J/(g·K), at 25℃
Sensitive Hygroscopic
Merck 14,1337
crystal system Three sides
Space group P31
Lattice constant
a/nmb/nmc/nmα/oβ/oγ/oV/nm3
0.43340.43340.833490901200.1356
Exposure limits ACGIH:TLV-TWA 10 mg/m3
OSHA:PEL-TWA 15 mg/m3 (total dust)
NIOSH:REL-TWA 10 mg/m3 (total dust)
Stability Stable. Moisture sensitive. Incompatible with water.
InChI 1S/B2O3/c3-1-5-2-4
InChIKey JKWMSGQKBLHBQQ-UHFFFAOYSA-N
SMILES O=BOB=O
Substances of Very High Concern (SVHC) Candidate List Diboron trioxide (1303-86-2)
CAS DataBase Reference 1303-86-2(CAS DataBase Reference)
EWG's Food Scores 1
FDA UNII 483W67CPF4
NIST Chemistry Reference Diboron trioxide(1303-86-2)
EPA Substance Registry System Boric oxide (1303-86-2)
UNSPSC Code 41116105
NACRES NB.21

SAFETY

Risk and Safety Statements

Symbol(GHS)  Health Hazard (GHS08)
GHS08
Signal word  Danger
Hazard statements  H360D
Precautionary statements  P201-P202-P280-P308+P313-P405-P501
PPE dust mask type N95 (US), Eyeshields, Gloves
Hazard Codes  Xi,T
Risk Statements  36/37/38-61-60
Safety Statements  26-37/39-45-53
OEB B
OEL TWA: 10 mg/m3
WGK Germany  1
RTECS  ED7900000
F  3-10
TSCA  TSCA listed
HS Code  28100010
Storage Class 6.1D - Non-combustible acute toxic Cat.3
toxic hazardous materials or hazardous materials causing chronic effects
Hazard Classifications Repr. 1B
Hazardous Substances Data 1303-86-2(Hazardous Substances Data)
Toxicity LD50 orally in Rabbit: 3150 mg/kg
IDLA 2,000 mg/m3
REACH Registrations Active
NFPA 704
1
0 1

Boron oxide price More Price(74)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich CB_88052031 BOLETH human cell line NOTE: Both the cell line and DNA from the cell line may be available for this product. Please choose 1 unit $436 2026-04-30 Buy
Sigma-Aldrich CB_88052031 BOLETH human cell line IHW Number: 9031, 88052031 1VIAL $610 2026-04-30 Buy
Sigma-Aldrich 15678 Boric anhydride puriss. p.a., ≥98% (T) 1303-86-2 1kg $584 2026-04-30 Buy
Sigma-Aldrich 11615 Boric anhydride granulated, ≥98.0% (T) 1303-86-2 1kg $129 2026-04-30 Buy
Sigma-Aldrich 1.00169 di-Boron trioxide 99.9995 Suprapur® 1303-86-2 150 g $1150 2026-04-30 Buy
Product number Packaging Price Buy
CB_88052031 1 unit $436 Buy
CB_88052031 1VIAL $610 Buy
15678 1kg $584 Buy
11615 1kg $129 Buy
1.00169 150 g $1150 Buy

Boron oxide Chemical Properties,Uses,Production

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.
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

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

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.

Definition

ChEBI: Diboron trioxide is a boron oxide with formula B2O3.

Application

Electronics Industry: Boron trioxide is one of the key materials in the manufacture of semiconductors and liquid crystal displays (LCDs). It serves as a dopant, helping to regulate the electrical conductivity of silicon wafers. Furthermore, it is utilised in the production of optical fibres, ensuring stable and efficient signal transmission. 
Glass and Ceramics Industry: In glass production, boron trioxide significantly enhances thermal resistance and chemical stability. For instance, laboratory-grade heat-resistant glass (such as Pyrex) contains boron trioxide. Within the ceramics sector, it lowers the melting point of glazes, thereby improving ceramic strength and lustre.
Flame Retardants: Boron trioxide serves as a key component in numerous flame retardants. It forms protective layers at elevated temperatures to inhibit flame propagation, finding extensive application in building materials, textiles, and plastic products.
Nuclear Industry: Within nuclear reactors, boron trioxide functions as a neutron absorber, aiding in the regulation of nuclear reaction rates to ensure safe reactor operation.

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.

reaction suitability

reagent type: catalyst
core: boron

Biochem/physiol Actions

Boric anhydride is an oxide of boron that shows antimicrobial property along with lower aminoalcohols.

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 anycontact lenses at once and irrigate immediately for at least15 min, occasionally lifting upper and lower lids. Seekmedical attention immediately. If this chemical contactsthe skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately.If this chemical has been inhaled, remove fromexposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing hasstopped and CPR if heart action has stopped. Transferpromptly to a medical facility. When this chemical hasbeen swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit.

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.

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.

Toxics Screening Level

The initial threshold screening level (ITSL) for boron oxide [CAS # 1302-86-2] is 520 μg/m3 based on a 1-hour averaging time. The ITSL is based on the methodology cited in Williams, 2019 memo on boric acid [CAS # 10043-35-3].

References

[1] A. MERGEN   M. B  M H Demirhan. Processing of boric acid from borax by a wet chemical method[J]. Advanced Powder Technology, 2003, 14 3: Pages 279-293. DOI:10.1163/15685520360685947.
[2] TAKWA E. ELLAKWA. Reviewing and exploring boron oxide’s role in bioactive glasses: a synthesis of modeling and applications[J]. Journal of the Australian Ceramic Society, 2024, 61 2: 719-732. DOI:10.1007/s41779-024-01103-w.
[3] LU DENG   Jincheng D. Development of boron oxide potentials for computer simulations of multicomponent oxide glasses[J]. Journal of the American Ceramic Society, 2018, 102 5: 2482-2505. DOI:10.1111/jace.16082.
[4] S. WATANABE. Antimicrobial properties of the products from the reaction of various ahinoalcohols and boric anhydride[J]. Materials Chemistry and Physics, 1988, 19 1: Pages 191-195. DOI:10.1016/0254-0584(88)90011-9.

Boron oxide Preparation Products And Raw materials

Raw materials

Sodium tetraborate decahydrate METABORIC ACID Boric acid TETRABORIC ACID

Preparation Products

Boron trifluoride bomn，amorphous Linalool ALUMINUM BORATE GALLIUM PHOSPHIDE
Cyclohexene oxide

1of2

Boron oxide Suppliers

Global( 451)Suppliers
Supplier Tel Email Country ProdList Advantage
Anhui Royal Chemical Co., Ltd. 		+86-025-86655873 +86-13962173137 marketing@royal-chem.com China 201 55
Hebei Chuanghai Biotechnology Co., Ltd 		+86-15350571055 Sibel@chuanghaibio.com China 8737 58
Shaanxi Dideu Medichem Co. Ltd 		+86-17392712779 1097@dideu.com China 3989 58
Henan Bao Enluo International TradeCo.，LTD 		+86-17331933971 deasea125996@gmail.com China 2452 58
Hebei Zhuanglai Chemical Trading Co.,Ltd 		13343047651 admin@zlchemi.com China 3689 58
Shandong Deshang Chemical Co., Ltd. 		+86-0531-8875-2665 +86-13153039501 info@deshangchem.com China 659 58
HEBEI SHENGSUAN CHEMICAL INDUSTRY CO.,LTD 		+86-15350851019; +86-15383190639 admin@86-ss.com China 992 58
Hebei Qujie Technology Co., Ltd. 		+86-0311-69886688 +8618533153922 admin@hbqujie.cn China 648 58
Henan Tianfu Chemical Co.,Ltd. 		+86-0371-55170693 +86-19937530512 info@tianfuchem.com China 21531 55
Hefei TNJ Chemical Industry Co.,Ltd. 		+86-0551-65418679 +86-18949832763 info@tnjchem.com China 2984 55
Supplier Advantage
Anhui Royal Chemical Co., Ltd. 		55
Hebei Chuanghai Biotechnology Co., Ltd 		58
Shaanxi Dideu Medichem Co. Ltd 		58
Henan Bao Enluo International TradeCo.，LTD 		58
Hebei Zhuanglai Chemical Trading Co.,Ltd 		58
Shandong Deshang Chemical Co., Ltd. 		58
HEBEI SHENGSUAN CHEMICAL INDUSTRY CO.,LTD 		58
Hebei Qujie Technology Co., Ltd. 		58
Henan Tianfu Chemical Co.,Ltd. 		55
Hefei TNJ Chemical Industry Co.,Ltd. 		55

Related articles

View Lastest Price from Boron oxide manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
Boron oxide pictures 2026-08-08 Boron oxide
1303-86-2
 0.99 RongNa Biotechnology Co.,Ltd
Boron oxide pictures 2026-08-07 Boron oxide
1303-86-2
 1bag 99% 70 T/Month Hebei Qujie Technology Co., Ltd.
Boron oxide pictures 2026-08-07 Boron oxide
1303-86-2
 $1.00-4.00 1KG 99% 200000KG Shaanxi Dideu Medichem Co. Ltd
  • Boron oxide pictures
  • Boron oxide
    1303-86-2
  • $0.00
  • 99%
  • Hebei Qujie Technology Co., Ltd.
  • Boron oxide pictures
  • Boron oxide
    1303-86-2
  • $1.00-4.00
  • 99%
  • Shaanxi Dideu Medichem Co. Ltd

Boron oxide Spectrum

Boron oxide(1303-86-2)IR

1303-86-2(Boron oxide)Related Search:

Magnesium oxide Titanium(III) oxide Sulfur trioxide Bismuth trioxide Yttrium oxide
Boron ETHYLENE OXIDE Iron oxide Chromium(VI) oxide NITRIC OXIDE
Phosphorus trioxide Boric acid Diantimony trioxide Propylene oxide COBALT(III) OXIDE BLACK
Zinc oxide Boron nitride Ferric oxide Boric Oxide

1of4

Boria boricoxide(b2o3) Boron oxide (B2O3) BORON OXIDE BORON (III) TRI-OXIDE BORIC ACID-ANHYDRIDE BORIC ACID, ANHYDROUS DI-BORON TRIOXIDE Boron sesquioxide boronoxide(b2o3) boronsesquioxide caswellno.109b Fused boric acid fusedboricacid oxydedebore BORON OXIDE, PELLETS, 2-2.5CM DIAM., 99. 99+% BORON TRIOXIDE GRANULATED BORON OXIDE, 99.98% BORON OXIDE 99% BORON OXIDE, 99.999% Di-BoronTrioxide(BoricOxide) BORON TRIOXIDE GR Boricanhydride=Trioxydedebore Boron oxide, Puratronic, 99.999% (metals basis) Boron oxide, Puratronic , (H{2}O 200ppm), 99.999% (metals basis) Boron oxide, Puratronic (metals basis) boron oxide, puratronic , (h 200ppm) 1,3-Dibora-2,4,5-trioxabicyclo[1.1.1]pentane Boron oxide/99.99% Boric anhydride pellets Boron anhydride Boron Oxide 99.9% Boric anhydride powder Boron oxide, -40 Mesh, 99% 1KG Boron oxide, Puratronic, (H2O 200ppm), 99.999% (metals basis) Boron oxide, 98%, -40 Mesh DI-BORON TRIOXIDE FOR SILICATE ANALYSIS DI-BORON TRIOXIDE 99.9995 SUPRAPUR BOLETH human cell line Boric anhydride 99.98% trace metals basis Boric anhydride puriss. p.a., >=98% (T) Boric anhydride Vetec(TM) reagent grade, 98% Boric anhydride, 99.999% (Metals basis) Boron trioxide - min 99.98% trace metals basis Boric trioxide Boron oxide, -40 mesh, 99% Boric Anhydride (Boron Trioxide B2O3) granular Boronoxide(99.6%-B) Boronoxide(99.9+%-B) boron oxide, puratronic BORICANHYDRIDE,PURIFIED Boron oxide, Puratronic(R), 99.999% (metals basis) Boron oxide, Puratronic(R), (H2O 200ppm), 99.999% (metals basis) Boron oxide, 99.98% (metals basis) Boron oxide, 97.5% min, typically 98.5% Boron oxide, 99.999% (metals basis) Boron oxide cyl. (H2O 200ppm): 99,9995%: 75mm: 210g/cyl. Boron oxide cyl. (H2O 225+/-25 ppm): dia 2": weight 55g: 99.9995%