Stabilization and protection

Whether inhibiting heat, flame, or corrosion, the purity of U.S. Borax ammonium pentaborate makes it an excellent choice for a variety of industrial applications. From fire protection to electrolytic capacitors, this alkaline salt offers stabilization and protection. Our ammonium pentaborate is a versatile product that dissolves easily, stores well, and is ideal for scenarios in which alkali metals cannot be used.

Ammonium Pentaborate

NH4B5O· 4H2O
Ammonium Pentaborate Tetrahydrate

Made In

France

What can U.S. Borax ammonium pentaborate do for you?

Our ammonium borate is a highly refined product which makes it ideal for a variety of industrial applications.

Ammonium pentaborate enhances industrial formulations

U.S. Borax ammonium pentaborate provides product and process benefits

  • Acts as an excellent solvent for metallic oxides at high temperatures
  • Extends the life of basic refractories in steel furnaces due to its stabilizing effect in gunning and patching compounds
  • Used as a readily soluble non-alkali borate when alkali metals aren’t an option

Applications

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Chemical and Physical Properties

Molecular weight: 272.15

Specific gravity: 1.58

Appearance: White crystalline granules

Solubility: About 10.9% by weight at room temperature

Stability: Ammonium pentaborate shows little tendency to cake except after prolonged storage or if it becomes severely wetted by rain or substantial water penetration. It is also capable of absorbing moisture if exposed to a humid environment.


Chemical Composition (Theoretical)

Boric oxide, B2O363.95%

Ammonium oxide, (NH4)2O: 9.57%

Water of crystallization, H2O: 26.48%

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

Ammonium Pentaborate Product Details

 

Ammonium pentaborate results from the controlled reaction of ammonia, water, and boric acid. It is an alkaline salt and consists of white crystalline granules.

The product is stable to about 230°F (110°C), at which point it loses all but two moles of water. If heated sufficiently, it releases the balance of its hydration water and decomposes to boric oxide and ammonia.

In aqueous borate solutions at room temperature, pH decreases slightly as the concentration of ammonium pentaborate increases. Details about the product’s hydrogen ion concentration and solubility in water is located in the product data sheet.
 

 

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

Ammonium Pentaborate in Action

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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 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.

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