14.5% Boron
29% Zinc

Perfect combination of boron and zinc

2:1 zinc-to-boron ratio

A perfect blend of zinc and boron

Boron and zinc deficiency in soils go hand-in-hand. That’s why U.S. Borax developed Zincubor®—the perfect balance of both zinc and boron to adequately supply your crops with the nutrition they need.

Application and benefits

Because zinc and boron deficiency are widespread around the world, a product with both nutrients is a good fit in many regions. Zincubor brings these two important micronutrients together in one product. Perfectly formulated with a 2:1 zinc-to-boron ratio that exactly meets most crop demands.
Zincubor is produced at U.S. Borax’s California facility in the United States. It is a synthetic fertilizer material made out of high-quality raw materials from our world-class boron and zinc sources. Zincubor is a consistent product with no added impurities and no fillers.
  • Micronutrient coating: Zincubor is designed to coat granular/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, Zincubor can be used as a raw material (intermediate ingredient) to produce enriched/fortified compound fertilizers.
Depending upon the country and cropping system, Zincubor can be applied directly to soil as a standalone application.

Technical Details

Zincubor is a made from the reaction of boric acid and zinc oxide. The boric acid is manufactured from ore found only in our Boron, California mine.

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

Technical Details
  • Boron (B) 14.5%
  • Zinc (Zn) 29%
  • Material required for 1 lb (.45 kg) of B and 2 lbs (.91 kg) Zn 6.9 lb (3.13 kg)
  • Derived from boric acid and zinc oxide
  • H2O solubility < 0.28% at 20°C
Bulk Density
  • Loose pack 41 lb/ft3 (649 kg/m3)
  • Tight pack 65 lb/ft3 (1,000 kg/m3)
  • Zincubor is available in 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.
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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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