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Boric Oxide

A pure form of B2O3

U.S. Borax boric oxide is ideal when boric acid is required without alkali metals and moisture. 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 
Diboron trioxide

Technical resources

› Safety data sheets
› Specification sheets
Product data sheet

Made in

USA and France

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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

Ceramics, enamels, and glazes

Ceramics, enamels, and glazes

Borates improve fit, luster, durability, and chemical resistance.

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Cleaners and detergents

Cleaners and detergents

Borates’ cleaning uses go beyond clothing into the industrial workplace.

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Glass and glass fibers

Glass and glass fibers

Durable borosilicate glass resists heat, chemicals, scratches, and shock.

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Industrial fluids and lubricants

Industrial fluids and lubricants

Borates are anticorrosive, antimicrobial, and pH-balancing—for smooth operations.

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Metals and gold

Metals and gold

Borates help protect ferrous metals from oxidation and harden steel.

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Polymers and coatings

Polymers and coatings

Polymers incorporate borate fire-retardant additives to meet safety standards.

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We’re here to help with your boron needs. 

Contact sales

Our regional sales teams are ready to help with your purchase

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Get technical support​

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

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​Request a sample

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

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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

SPECIFICATIONS SHEETS
U.S. Borax product grades explained

4 Mesh
60 Mesh
200 Mesh
ADDITIONAL DOWNLOADS
› Safety data sheets
› Boric oxide technical bulletins

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.

RELATED RESOURCCES
› U.S. Borax powders
› Product stewardship

 

Contact our sample fullfillment team.

REQUEST A SAMPLE

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

DOWNLOADS
› Safety data sheets
› Boric oxide brochures
RELATED RESOURCES
› U.S. Borax Powders
› Product stewardship
Contact us

Boric Oxide in Action 

Immobilizing Nuclear Waste with Borosilicate Glass
Discover borates’ role in nuclear waste vitrification and how borosilicate glass provides a long-term option for containing radioactive materials. Learn More
How Boron Nitride Improves Aluminum Extrusion
Aluminum extrusion is becoming more productive, less wasteful, and safer due to boron nitride solutions. Discover how boron is enhancing efficiency in this cr... Learn More
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
RESOURCES
› Boric oxide safety data sheets
› Boric oxide downloads
› U.S. Borax powders
› Product stewardship
Product Data Sheets
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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 650 customers with more than 1,800 delivery locations globally. We supply around 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.

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