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BORON OXIDE

Molecular formula

Molar Mass

Appearance

Density

Melting Point

Boiling Point

Soluability in Water

:B2O3

:69.6182 g/Mol

:White-Glassy Crystalline Solid, Off ash which in Powder form

:2.4~2.6 gm/CC

:510 °C

:1860 °C

:22gm/Liter

Boron Oxide, the pure form of B2O3, is a hard glassy material, granular in texture. Exposed to the atmosphere it slowly absorbs water, reverting to boric acid. It is soluble in water but at a much slower rate than boric acid. Boron Oxide is used where B2O3 is required without the presence of sodium or calcium and/or where water would be detrimental to the process.

Chemical Specification

Analyte

B2O3 %

SO4 ppm

Cl ppm

Fe ppm

Guarantee

80.00

=250

=10

=4

Sieve Specification

Grade

Granular

Normal Powder

Fine Powder

ASTM Mesh

20

100

200

Size in micron

850

150

75

% Retained Guarantee

=2.0

=5.0

=10.0

USE AND APPLICATIONS:

Specialty glasses

Pure B2O3 is needed for the production of certain types of glasses including optical and telescope lenses, medical glasses (ampoules), electronic glasses and glass-ceramic composites. The general benefits of using B2O3 in glass formulations are reduction of melting temperature, increased thermal resistance and mechanical strength, and enhanced aqueous and chemical durability.

Specialty ceramics

Boron Oxide is used to produce various types of high strength and heat-resistant ceramic products such as boron carbide, boron nitride, titanium and zirconium diborides, as well as elemental boron.

Refractories

It is used in the manufacture of chemically bonded firebricks and castables which require resistance to high temperature, abrasion and corrosion. Boron Oxide is used as a binder for magnesia-based refractory bricks and as a stabilizer for dolomite refractory bricks commonly used in steel smelting furnaces.

Glazes and enamels

Boron Oxide increases the strength, scratch resistance, and chemical resistance of ceramic wares such as wall and floor tiles, tableware and porcelain, and of enamelled appliances. Generally, Boron Oxide which has a capacity to increase yields is used for a combination of reasons, the final glaze or enamel benefiting from its influence on both the melting and physical properties of the product.

Chemical reactions

Boron Oxide is used in the preparation of boron halides, sodium borohydride, metallic borates, and borate esters. It is also used as a catalyst in the conversion and synthesis of many organic compounds.

Metallurgy

Boron Oxide is an excellent solvent for metallic oxides at high temperatures. In the field of metallurgy, Boron Oxide is used in the preparation of special welding and soldering fluxes, in chemical-bonded refractories, in the hardening of steel, and in the production of alloys with iron, nickel or manganese. It is also used to produce amorphous metal and rare-earth magnets.

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