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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If processed into borax pentahydrate crystals
Hydrated synthetic borax products shift to Chapter 28 as salts of inorganic acids.
If for retail agricultural fertilizers
If ground and packaged for direct fertilizer use, it may classify under animal/vegetable fertilizers in Chapter 31.
If unrefined crushed ore
Less concentrated natural borates without processing fall under the broader natural borates heading.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Obtain geological origin certificates proving natural mining source; test for H3BO3 content to ensure compliance with statistical note exclusions
• Beware of fines for undeclared moisture content affecting dry weight calculations
Related Products 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.
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.