Search U.S. Borax Products
High quality, high reliability, high performance borate products. It’s what we’re known for.
Featured products
Featured applications
About U.S. Borax
Global leadership in industrial borate supply, technology, and science—with local commitment to people and community.
Learn More
Partnering with U.S Borax
Get quick answers and easy connections to product documentation, certification and safety information, expert technical support, and more.
Common support topics
Support documentation
Product quality
NH4B5O8 · 4H2O Ammonium pentaborate tetrahydrate Diammonium decaborate octahydrate
France
Borates are used in lithium-ion batteries and supercapacitors.
Use U.S. Borax products in fire retardants for polymers, cellulose, and wood.
Enhance insulation fiberglass and help protect cellulosic insulation from fire.
Borates help protect ferrous metals from oxidation and harden steel.
Polymers incorporate borate fire-retardant additives to meet safety standards.
Our regional sales teams are ready to help with your purchase
Your resource for borate-related technical and laboratory services across every industry
Get small quantities of our products to ensure you have what you need for your formulation or process
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.
Boric oxide, B2O3: 63.95%
Ammonium oxide, (NH4)2O: 9.57%
Water of crystallization, H2O: 26.48%
Containers: Products may be available in drums or IBCs
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.
REQUEST A SAMPLE
Get small quantities of our products to ensure you have what you need for your formulation or process Learn More
Because we respect your right to privacy, you can choose not to allow some types of Cookies. Click on the different category headings to find out more.
To read more on how we use Cookies, please refer to the Cookies section in our Privacy Statement.