Boric Oxide

Boric 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. Approximately 56.3 kg of boric oxide are the chemical equivalent of 100 kg of boric acid. Boric oxide is used where B2O3 is required without the presence of sodium or calcium and/or where water would be detrimental to the process.
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Applications & Benefits

Grades
Anhydrous Boric Acid 4 Mesh – North America
Anhydrous Boric Acid 60 Mesh
200 Mesh – EMEAI
RG – EMEAI

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
Boric 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. Boric 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
Boric 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, boric 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
Boric 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
Boric oxide is an excellent solvent for metallic oxides at high temperatures. In the field of metallurgy, boric 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.