A pure form of B2O3

U.S. Borax boric oxide is a pure anhydrous product. It is ideal when boric acid is required without metals. This hard, glassy, granular product is water-soluble at a much slower rate than boric acid—and reacts exothermically when wetted. When exposed to the atmosphere, it slowly absorbs water, reverting to boric acid.

Boric Oxide

B2O3 
Anhydrous Boric Acid

Made In

USA and France

What can our boric oxide do for you?

U.S. Borax boric oxide is a powerful tool in the production of specialty glasses, ceramics, enamels, and welding/soldering fluxes.

U.S. Borax boric oxide enhances industrial formulations

  • Reduces melting temperatures, increases thermal resistance and mechanical strength, and enhances aqueous and chemical durability in various glass formulations
  • Produces elemental boron in ceramic manufacturing 
  • Acts as an excellent solvent for metallic oxides at high temperatures
  • Acts as a catalyst in the conversion and synthesis of many organic compounds, as well as in the preparation of boron halides, sodium borohydride, metallic borates, and borate esters

Borc oxide improves industrial processes and product performance 

  • Increases the yields, strength, and scratch- and chemical-resistance of ceramic products
  • Binds magnesia-based refractory bricks
  • Stabilizes dolomite refractory bricks

Applications

We’re here to help with your boron needs. 

Contact sales


Our regional sales teams are ready to help with your purchase

Learn More

Get technical support​

 

Your resource for borate-related technical and laboratory services across every industry

Learn More

​Request a sample


Get small quantities of our products to ensure you have what you need for your formulation or process

Learn More

Chemical and Physical Properties

Molecular weight: 69.62

Specific gravity: 1.84

Appearance: Hard, glassy granules

Melting point: 450°C to 465°C (842°F to 869°F)

Stability: Hygroscopic; avoid exposure to water or humidity and maintain packaging integrity to prevent caking and the formation of boric acid.


Chemical Composition (Theoretical)

Boric oxide, B2O3: 100% 

Containers: Products may be available in bulk, IBCs, or small bags

Boric Oxide Product Details

The normal glassy form of boric oxide has no definite melting point. It begins to soften at about 325°C (617°F) and subsequently flows above 450°C (842°F).

Boric oxide is a hygroscopic product. Avoid exposure to water or humidity, which can cause caking. If wetted, the project reacts exothermically, forming boric acid, so maintaining the integrity of the packaging is also essential.

Approximately 56.3 kg of boric oxide are the chemical equivalent of 100 kg of boric acid.

The reaction of boric oxide with water is highly exothermic.

 

Contact our sample fullfillment team.

We’re here to help with your boron needs.

Contact sales


Our regional sales teams are ready to help with your purchase

Learn More

Get technical support

 

Your resource for borate-related technical and laboratory services across every industry

Learn More

Request a sample


Get small quantities of our products to ensure you have what you need for your formulation or process

Learn More

Boric Oxide in Action 

Borates and Sustainability in Glass Manufacturing
U.S. Borax is a valued research and technical partner for leading companies in the glass industry as they pursue aggressive goals for reducing carbon emissions. Learn More
Borates in Glass Manufacturing: Unbreakable Benefits, Unbeatable Versatility
Glass is an essential product for modern living, and glass manufacturers are working to build a sustainable path for the industry’s future. Learn More
Surfing Waves and the Web on Borosilicate Textile Fiberglass
Boric oxide is essential for the manufacture of textile fiberglass (TFG), a versatile, threadlike borosilicate glass that is used in applications from marine ... Learn More

U.S. Borax, part of Rio Tinto, is a global leader in the supply and science of borates—naturally-occurring minerals containing boron and other elements. We are 1,000 people serving 500 customers with more than 1,700 delivery locations globally. We supply 30% of the world’s need for refined borates from our world-class mine in Boron, California, about 100 miles northeast of Los Angeles.  Learn more about Rio Tinto.

Copyright © 2021 Rio Tinto. All Rights Reserved.