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Boron oxide

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Boron oxide

EINECS 215-125-8
CAS No. 1303-86-2 Density 2.46 g/mL at 25 °C(lit.)
PSA 43.37000 LogP -1.60300
Solubility 36 g/L (25 °C) in water Melting Point 450 °C
Formula B2O3 Boiling Point 1860 °C
Molecular Weight 69.62 Flash Point 1860°C
Transport Information Appearance white powder or glassy flakes
Safety 26-37/39 Risk Codes 36/37/38
Molecular Structure Molecular Structure of 1303-86-2 (Boron oxide) Hazard Symbols IrritantXi
Synonyms

Boron trioxide;Boron(III) oxide;Diboron trioxide;Fused boricacid;Boracicanhydride;Boria;Boria (B2O3);Boric acid (HBO2), anhydride;Boric acidanhydride;Boric anhydride;Boronsesquioxide;

 

Boron oxide Consensus Reports

Reported in EPA TSCA Inventory.

Boron oxide Standards and Recommendations

OSHA PEL: Total Dust: TWA 10 mg/m3; Respirable Fraction: TWA 5 mg/m3
ACGIH TLV: TWA 10 mg/m3
DFG MAK: 15 mg/m3

Boron oxide Analytical Methods

 For occupational chemical analysis use NIOSH: Nuisance Dust, Total, 0500; Nuisance Dust, Respirable, 0600.

Boron oxide Specification

The Boron oxide, with the CAS registry number 1303-86-2,is also known as Diboron trioxide; Boric oxide; Boron trioxide. It belongs to the product categories of Industrial/Fine Chemicals;Inorganics;metal oxide. This chemical's molecular formula is B2O3 and molecular weight is 69.62.Its EINECS number is 215-125-8. What's more,Its systematic name is Boron oxide. It is a white powder or glassy flakes which is stable,moisture sensitive and incompatible with water.It is irritating to eyes, respiratory system and skin.When you use it ,wear suitable gloves and eye/face protection. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Boron oxide can be prepared by treating borax with sulfuric acid in a fusion furnace. Keep the temperatures is above 750 °C, separate the molten boron oxide layer out from sodium sulfate. Then decant, cool and obtain this product in 96-97% purity.

Physical properties about Boron oxide are:
(1)#H bond acceptors:  3; (2)#H bond donors:  0; (3)#Freely Rotating Bonds:  2; (4)mp: 450 °C(lit.); (5)bp: 1860 °C; (6)density: 2.46 g/mL at 25 °C(lit.); (7)vapor density: >1 (vs air); (8)Fp: 1860°C; (9)Water Solubility: 36 g/L (25 oC); (10)Merck: 14,1337.

You can still convert the following datas into molecular structure:
(1)SMILES:O=BOB=O;
(2)Std. InChI:InChI=1S/B2O3/c3-1-5-2-4;
(3)Std. InChIKey:JKWMSGQKBLHBQQ-UHFFFAOYSA-N.

Uses of Boron oxide:
Boron oxide is used as a flux and also used for glass, enamel, production of boron compounds . In the color TVset industry, it's used as adulterate source for the  silicon source and the flux when silicate decomposes. It can also be used for the manufacture of boron. Concentrated boric anhydride solutions also can be used as hardeners of formo-phenolic resols, more particularly for the manufacture of laminates comprising glass fibers and formo-phenolic resols. In organic synthesis, Boric anhydride can play an important role, for example, when use carboxylic acid and phenol to prepare carboxylic esters of phenols, if Boric anhydride exits in the reaction solution, the process can improved.
 
The toxicity data of Boron oxide are as follows:

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LD50 intraperitoneal 1868mg/kg (1868mg/kg)   "Toxicometric Parameters of Industrial Toxic Chemicals Under Single Exposure," Izmerov, N.F., et al., Moscow, Centre of International Projects, GKNT, 1982Vol. -, Pg. 27, 1982.
mouse LD50 oral 3163mg/kg (3163mg/kg)   "Toxicometric Parameters of Industrial Toxic Chemicals Under Single Exposure," Izmerov, N.F., et al., Moscow, Centre of International Projects, GKNT, 1982Vol. -, Pg. 27, 1982.

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