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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If chemically refined to disodium tetraborate
Refined borates like anhydrous borax are classified as synthetic inorganic compounds in Chapter 28, not natural mineral products.
If primarily calcium-based like colemanite
Natural borates other than sodium varieties fall under the residual subheading of heading 2528.
If mixed with other earth minerals
Borates blended with significant quantities of unrelated minerals may classify as mineral substances in heading 2530.
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Import Tips & Compliance
• Verify mineral composition via assay certificates to confirm sodium borate content; ensure calcination process documentation to avoid misclassification as unprocessed ore
• Check for radioactive impurities common in borate deposits
Related Products under HTS 2528.00.00.05
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.