20.8% Boron

Boron for fertilizer manufacturing

High-quality, versatile boron

Ideal for Fertilizer Manufacturers

Anhybor® is designed with fertilizer manufacturers in mind. This refined U.S. Borax product is made from the dehydration and fusion of borax. Anhybor can be used to produce boron-enriched compound fertilizers.

Application and benefits

Anhybor is a versatile product that satisfies your need for high quality boron in the following applications:
  • Fertilizer coating: Anhybor Fine is designed to be used as a coating formulation for granular and compacted fertilizers giving flexibility on the micronutrient rate and assuring an even distribution in the field. U.S. Borax recommends the use of a binder material during the coating process.
  • Compound fertilizer: In certain countries, Anhybor can be used as a raw material (intermediate ingredient) to produce enriched/fortified compound fertilizers
  • Direct soil application: Depending upon the country and cropping system, Anhybor can be soil applied via fertilizer mixture where it is present as an intermediate ingredient
Anhybor contains no added impurities, fillers, or additional ingredients. In addition, you will find that Anhybor has a reduced risk of segregation.
Anhybor contains no structural water.

Technical Details

Anhybor is a product resulting from the dehydration and fusion of borax. It is produced solely from the tincal ore found  in our Boron, California mine. As a result, the product is a sodium borate—free of calcium.

Anhybor product is never treated with chemicals or other impurities or added ingredients, or fillers.

U.S. Borax offers multiple grades for your particular needs:

  • Anhybor 12-mesh and 30-mesh: Designed for compound fertilizer manufacturing as an intermediate ingredient
  • Anhybor Fine with the aid of a binder


Technical Details
  • Boron (B) 20.8%
  • Material required for 1 lb (.45 kg) of B 4.81 lb (2.18 kg)
  • Derived from tincal
  • Grades
  • 12-mesh For compaction
  • 30-mesh For compaction
  • Fine For coating with the aid of a binder
Bulk Density
  • 67 lb/ft3 (1,074 kg/m3)
  • Anhybor is available in bulk, 2,500 lb (1,000 kg) IBC bags, or 25 lb (11.3 kg) plastic bags.
Registration or notification is required for use in certain countries. Contact your regional sales representative for product availability.
Take the Next Step
Request a sample Ready to buy?

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.

Copyright © 2023 Rio Tinto. All Rights Reserved.