Chapter 2528 — Customs Tariff Headings
Products classified under Tariff item 25.28
Anhydrous Borax Concentrate
Anhydrous borax concentrate produced by calcining natural tincal or kernite ores, resulting in dehydrated sodium borate suitable for welding fluxes. This product falls under tariff item 2528.00.00 as a calcined natural borate derived from solid mineral deposits, not from natural brine.
2528.00.00Anhydrous Borax Natural Concentrate
Anhydrous borax natural concentrate is derived from natural sodium borate deposits and calcined to remove water, for use in detergents and enamels. It falls under tariff item 2528.00.00 as a natural borate not from brine, with H3BO3 under 85% on dry weight.
2528.00.00Calcined Colemanite Borate Concentrate
Calcined colemanite borate concentrate is a naturally occurring calcium borate mineral processed by heating to remove water, used primarily in glass and ceramic manufacturing. It falls under tariff item 2528.00.00 as a calcined natural borate concentrate.
2528.00.00Calcined Colemanite Borate Ore
Calcined colemanite ore, a naturally occurring calcium borate mineral mined in Turkey, processed by heating to remove moisture while preserving borate content. It is classified under tariff item 2528.00.00 as a natural borate concentrate, not separated from brine.
2528.00.00Calcined Sodium Borate Flux Grade
Calcined sodium borate flux grade, a concentrate of natural sodium borates processed for use as a flux in glassmaking and enameling industries. This product falls under tariff item 2528.00.00 as a calcined natural sodium borate from mineral sources, not brine.
2528.00.00Calcined Tincal Borate Concentrate
Calcined tincal borate concentrate, heat-treated natural borax for soldering fluxes and heat-resistant alloys. It is included in tariff item 2528.00.00 as a calcined form of natural sodium borate from solid mineral deposits.
2528.00.00Calcined Ulexite Ore Concentrate
Calcined ulexite ore concentrate, a natural sodium calcium borate mineral concentrated and calcined for industrial use in glass and ceramics production. It falls under tariff item 2528.00.00 as a natural sodium borate concentrate that has been calcined.
2528.00.00Colemanite Ore
Colemanite ore is a naturally occurring calcium borate mineral (Ca2B6O11·5H2O) mined from evaporite deposits, typically white to colorless. It is classified under tariff item 2528.00.00 as a natural borate in its crude or concentrated state, not separated from brine.
2528.00.00Hydroboracite Borate Mineral Powder
Hydroboracite borate mineral powder is a magnesium calcium borate ground into powder for enamel frits and insulation compounds. It classifies under tariff item 2528.00.00 as other natural borate concentrates from solid deposits, with H3BO3 under 85% dry.
2528.00.00Hydroboracite Crude Concentrate
Hydroboracite crude concentrate is a white fibrous calcium magnesium borate mineral (CaMgB6O11·6H2O) extracted from evaporite basins and concentrated via flotation. It falls under tariff item 2528.00.00 as a natural borate concentrate, not separated from brine.
2528.00.00Kernite Borate Concentrate
Kernite borate concentrate, a sodium borate mineral from solid deposits, concentrated into powder and often partially calcined. This product qualifies under tariff item 2528.00.00 as a natural borate from solid mineral sources, not from brine.
2528.00.00Kernite Sodium Borate Concentrate
Kernite sodium borate concentrate, a naturally occurring sodium borate mineral mined and concentrated for use in detergents and agriculture. It is classified under tariff item 2528.00.00 as a natural sodium borate concentrate, not derived from brine.
2528.00.00Natural Boric Acid Powder from Rasorite
Natural boric acid powder derived from rasorite (refined kernite) through concentration and limited processing, containing not more than 85% H3BO3 on a dry weight basis. It qualifies for tariff item 2528.00.00 as a natural boric acid from solid mineral deposits.
2528.00.00Natural Sodium Borate Powder (Concentrate)
Natural sodium borate powder concentrate, fine-ground from natural sodium borate ores, suitable for ceramic glazes and herbicides. It is classified in tariff item 2528.00.00 for natural sodium borates whether calcined or not, provided not from separated brine.
2528.00.00Natural Ulexite Borate Ore
Natural ulexite borate ore is a hydrated sodium calcium borate mineral mined as sodium borate ore, commonly used in fertilizers and fiberglass production. It is classified under tariff item 2528.00.00 as a natural borate not from brine, with H3BO3 content under 85%.
2528.00.00Pandermite Calcium Borate Lump
Pandermite calcium borate lumps are a variety of colemanite from Turkish deposits, with B2O3 content around 30-35%. They are supplied as natural, uncalcined calcium borate lumps, qualifying under tariff item 2528.00.00 as natural borates not from brine.
2528.00.00Priceite Calcium Borate Mineral
Priceite calcium borate mineral (Ca4Mg2B10O23) occurs naturally and is concentrated for specialty glass and flux applications. It qualifies for tariff item 2528.00.00 as other natural borates not from brine, maintaining H3BO3 under 85%.
2528.00.00Priceite Calcium Borate Ore
Priceite calcium borate ore, a rare natural mineral from boron-rich deposits, supplied as crushed ore or powder for specialty ceramics. It meets tariff item 2528.00.00 criteria as an unrefined natural borate concentrate, not from brine.
2528.00.00Priceite Natural Borate
Priceite natural borate is a rare calcium borate hydroxide mineral (Ca4MgB10O19(OH)10·6H2O) found in boron deposits, appearing as yellow-brown crystals. It qualifies for tariff item 2528.00.00 as a natural borate concentrate from mineral deposits.
2528.00.00Refined Kernite Borate Granules
Refined kernite borate granules, granulated concentrate from kernite ore for agricultural boron supplements. It falls under tariff item 2528.00.00 as a natural sodium borate concentrate suitable for calcining if needed.
2528.00.00Sassolite Natural Boric Acid Crystals
Sassolite natural boric acid crystals come from volcanic fumaroles, capped at 85% purity for this category. Used in pharmaceuticals and antiseptics precursors, they fall under tariff item 2528.00.00 as natural boric acid.
2528.00.00Tincal Crude Borax Ore
Tincal crude borax ore, a native sodium borate found in solid form in salt lakes, concentrated without brine separation for glassmaking. It is classified under tariff item 2528.00.00 as a natural sodium borate, not separated from brine.
2528.00.00Ulexite Calcium Borate
Ulexite calcium borate, known as TV rock, is a hydrated sodium calcium borate mineral (NaCaB5O6(OH)6·5H2O) that appears fibrous and translucent, sourced from boron-rich lake beds. It is classified under tariff item 2528.00.00 as a natural borate not from brine.
2528.00.00Ulexite Sodium Borate Lumps
Ulexite sodium borate lumps, lump-form concentrate of fibrous ulexite used in fiberglass production. It falls under tariff item 2528.00.00 as a natural sodium borate not separated from brine, in minimally processed lump state.
2528.00.00Ulexite Sodium Calcium Borate Mineral
Ulexite sodium calcium borate mineral, known as TV rock, concentrated from deposits in California and Chile and supplied in powder form. It is classified under tariff item 2528.00.00 as a natural borate not from brine.
2528.00.00Uncalcined Borax Ore (Tincal)
Uncalcined borax ore (tincal), a natural crude borax sodium borate mineral concentrate extracted from evaporated lake deposits and used in metallurgy. It qualifies for tariff item 2528.00.00 as an uncalcined natural sodium borate concentrate, not from brine.