Bortrioxid

Bortrioxid, also known as boron trioxide, is an inorganic compound with the chemical formula B2O3. It typically appears as a white, odorless solid and forms a three-dimensional network structure in the solid state. It has a high melting point and is relatively inert at ambient conditions, but it readily hydrolyzes in water to produce boric acid (B(OH)3).

In water, bortrioxid reacts to form boric acid according to the reaction: B2O3 + 3 H2O → 2 B(OH)3. The compound is only sparingly soluble in water and behaves as a mild dehydrating agent. It is often handled as a dry powder or crystalline material to minimize hydrolysis prior to use.

Occurrence and production typically note that bortrioxid does not occur as a free mineral in nature. It is produced industrially by high‑temperature oxidation of boron-containing materials or by the dehydration of boric acid through condensation reactions. It also forms a component of various borate minerals and is a precursor in the preparation of many boron-containing compounds.

Applications of bortrioxid center on its role as a glass and ceramic flux and glass former. It is a key component in borosilicate glasses, where it improves thermal and chemical durability and lowers the melting temperature of silica blends. It is also used in enamel formulations, ceramic glazes, and as a starting material for boron-containing reagents and materials in research and industry.

Safety considerations include that bortrioxid can be an irritant in dusty form, with potential irritation to the eyes, skin, and respiratory tract. Proper handling, ventilation, and protective equipment are advised to minimize exposure.