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Diboron Trioxide | Boron Oxide

Executive standard: Q/TY·J08.04-2015
CAS NO. 1303-86-2
English alias: Boron oxide, Boron Trioxide, Boric oxide, Boric anhydride
Chines alias: 氧化硼;硼酸酐;硼酐


Executive standard: Q/TY·J08.04-2015

Chines alias: 氧化硼;硼酸酐;硼酐

English alias: Boric oxide, Boron oxide, Boric anhydride, Boron Trioxide

CAS RN: 1303-86-2

1. Physical and chemical properties:

1.1 Molecular formula: B2O3

1.2 Molecular weight: 69.62

1.3 Structure formula:


1.4 Melting point: 450℃

1.5 Boiling point:1860℃

1.6 Density: 1.085 g/mL (Amorphous)

1.7 Solubility: Dissolved in acid, ethanol, hot water, and slightly dissolved in cold water.

1.8 Properties: Colorless crystal powder. Be greasy in the surface. With strong hygroscopicity, it is easy to be hydrolysised to form boric acid. In high temperature, it can be reduced by alkali metal or magnesium to monocrystal boron. It can be completely mixed with the oxides of metal, copper, sliver, aluminum, tin, arsenic.

2. Technical indexes:

Item index
1st grade 2nd grade
Boron oxide, %(m/m) ≥98.0 ≥95.0
Particle size (d50), µm 1~3
Appearance White loose powder

3. Application: It has been used as the fusion agent in decomposition of silicates, the dopant of semiconductor material, the additives of heatproof glassware and paint refractory. It has been used in production of alloy steel in metallurgical industry. In addition, it’s used as the catalyst of organic synthesis, the additive of lubricant used in high temperature, and can be also used to environmental protection.

4. Safety instructions: Toxic by ingestion, inhalation, eye and skin contact. Eye and skin contact can cause inflammation. The maximum allowable concentration of the working place is 15 mg/m3 (OSHA). Operation must be installed with rubber gloves, a respirator and eye protection by wearing protective clothing.

5. Packing: Woven bag lined with plastic bag, net weight 25kg /bag.

6. Storage: Stored in a cool, ventilated place. The shelf life is 12 months after manufacturer date. It is still available if retest result is qualified after expire date Used in a dry place. When humidity dramatic change, it may crystallize and caking. Cautions in storage should keep away from the dramatic change environment, and ensure intact packing.

7. TransportationAvoid water, exposure and violent collision .Do not transport with strong oxidizers.


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