Boron Oxide Powder

Updated: 2026-08-30

Overview

Boron oxide powder (B2O3) is an inorganic compound commonly referred to as diboron trioxide or boric anhydride. It is a vital industrial chemical with applications ranging from glass production to flame retardants. The powder form is particularly valued for its ease of handling and uniform distribution in manufacturing processes. Boron oxide is derived from boric acid through dehydration and is available in both amorphous and crystalline forms. Its ability to lower the melting point of silica makes it indispensable in glass and ceramic industries. The compound's hygroscopic nature requires careful storage to maintain its efficacy.

Physical and Chemical Properties

Boron oxide powder exhibits unique physical and chemical properties that make it suitable for diverse industrial applications. It appears as a white amorphous powder or colorless glassy solid, depending on its form. The compound is highly hygroscopic, absorbing moisture from the air, which can affect its performance in certain applications. With a melting point of approximately 450°C for the amorphous form and 510°C for the crystalline form, boron oxide is stable at high temperatures. It dissolves readily in hot water, forming boric acid, and reacts with metal oxides to form borate glasses. These properties are leveraged in glass and ceramic production to enhance thermal and chemical resistance.

Main Applications

The primary use of boron oxide powder is in the glass and ceramics industries, where it acts as a flux to lower melting temperatures and improve thermal shock resistance. It is a key component in borosilicate glass, known for its durability and resistance to thermal expansion. In addition to glass manufacturing, boron oxide is used as a flame retardant in plastics and textiles, where it releases water when heated, thereby inhibiting combustion. It also finds applications in metallurgy as a flux for soldering and welding, and in the production of specialty chemicals such as boron nitride and boron carbide.

Safety and Storage

Handling boron oxide powder requires adherence to safety protocols to minimize health risks. The compound can cause irritation to the skin, eyes, and respiratory system upon contact or inhalation. Workers should use personal protective equipment (PPE), including gloves, goggles, and masks, when handling the powder. Storage conditions are critical to maintaining the quality of boron oxide. It should be kept in a dry, cool, and well-ventilated area, sealed in moisture-proof containers to prevent absorption of water. Proper labeling and segregation from incompatible materials, such as strong bases, are essential to avoid hazardous reactions.

B2B Procurement Guide

When procuring boron oxide powder for industrial use, buyers should prioritize purity, particle size, and packaging specifications. High-purity grades (≥99%) are essential for applications in glass and electronics, where contaminants can compromise product quality. Particle size distribution affects the powder's reactivity and dispersion in manufacturing processes. Buyers should request technical data sheets and certificates of analysis to verify product consistency. Bulk procurement may offer cost advantages, but ensure storage facilities meet the compound's hygroscopic requirements. Reliable suppliers with a track record in chemical distribution are recommended.