Natural sodium borates and concentrates thereof (whether or not calcined)
Natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 percent of H3BO3 calculated on the dry weight > Natural sodium borates and concentrates thereof (whether or not calcined)
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 2528.00.00.05
Calcined Ulexite Ore Concentrate
Ulexite is a natural sodium calcium borate mineral concentrated and calcined for industrial use in glass and ceramics production. It falls under HTS 2528.00.0005 as a natural sodium borate concentrate that has been calcined, excluding borates separated from brine. This form enhances solubility for manufacturing applications.
Kernite Sodium Borate Concentrate
Kernite is a naturally occurring sodium borate mineral (Na2B4O7·4H2O) mined and concentrated for use in detergents and agriculture. Classified under HTS 2528.00.0005 as a natural sodium borate concentrate, not derived from brine separation. It provides a key source of boric oxide for various industries.
Uncalcined Borax Ore (Tincal)
Tincal, or natural crude borax, is a sodium borate mineral concentrate extracted from evaporated lake deposits and used in metallurgy. It qualifies for HTS 2528.00.0005 as an uncalcined natural sodium borate concentrate from non-brine sources. This form is valued for its fluxing properties in welding.
Calcined Sodium Borate Flux Grade
This calcined concentrate of natural sodium borates is processed for use as a flux in glassmaking and enameling industries. HTS 2528.00.0005 covers it explicitly as calcined natural sodium borates from mineral sources, not brine. It lowers melting points in high-temperature applications.
Natural Sodium Borate Powder (Concentrate)
Fine-ground concentrate from natural sodium borate ores, suitable for ceramic glazes and herbicides. Classified in HTS 2528.00.0005 for natural sodium borates whether calcined or not, provided not from separated brine. Particle size controlled for uniform dispersion in formulations.
Ulexite Sodium Borate Lumps
Lump-form concentrate of ulexite, a fibrous sodium borate mineral used in fiberglass production. Falls under HTS 2528.00.0005 as natural sodium borate not separated from brine, in minimally processed lump state. Ideal for controlled dissolution in manufacturing.
Calcined Tincal Borate Concentrate
Heat-treated tincal (natural borax) concentrate for soldering fluxes and heat-resistant alloys. HTS 2528.00.0005 includes calcined forms of natural sodium borates from solid mineral deposits. Provides essential boron for metallurgical processes.
Refined Kernite Borate Granules
Granulated concentrate from kernite ore for agricultural boron supplements. Under HTS 2528.00.0005 as natural sodium borate concentrate suitable for calcining if needed. Granules ensure even soil distribution.