is produced solely from sodium tetraborate pentahydrate, which is refined from the tincal ore found only in our Boron, California mine. As a result, the product is a sodium borate—free of calcium, which can cause boron deficiency in plants.
We refine Granubor only through physical means:
The product is never treated with chemicals or other impurities or added ingredients, fillers, or coatings.
To help guarantee its optimal average particle size of 2.8 mm, Granubor
is screened between -4 and +14 mesh. With very few particles falling outside these values, the product has a uniform size distribution, similar to popular blends of prilled and granulated fertilizers. As a result, less segregation occurs during bagging, transport, and application.
Surface treatment with borate reduces degradation and dust content of Granubor.
The product has a particle strength of 9 lb (4.08 kg) per granule. And no other product has a dust content of less than 2,000 ppm.
The typical flow rate of Granubor
is 11 lb (4.99 kg) per minute, according to fertilizer industry standard EN 1235-1995. The product can be pneumatically transported, tipped, and conveyed.
Bulk density is 57 pounds/ft3
) loose or 60 pounds/ft3
) tight, with a 30° angle of repose.
is formulated to provide a slow release of boron, for long-lasting crop support during the all-important growing season.