Anhydrous Borax Natural Concentrate
Anhydrous borax concentrate derived from natural sodium borate deposits, calcined to remove water for use in detergents and enamels. HTS 2528.00.0050 applies to this non-brine natural borate with H3BO3 under 85% on dry basis. It is supplied as powdered or granular mineral product.
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 sodium tetraborate decahydrate
Specific hydrated synthetic or refined forms of borax classify as borates in Chapter 28.
If incorporated into ceramic refractory goods
Borates mixed into finished refractories fall under Chapter 69, not raw minerals.
If pebbles, gravel or crushed forms for construction
Chapter note prioritizes 2517 for any macadam or ballast-like crushed borates.
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Import Tips & Compliance
• Include calcination process certification to validate anhydrous state; avoid contamination that could raise purity over limits
• Use ventilated containers to prevent caking from residual humidity
Related Products under HTS 2528.00.00.50
Calcined Colemanite Borate Concentrate
Calcined colemanite is a naturally occurring calcium borate mineral concentrate processed by heating to remove water, used primarily in glass and ceramic manufacturing. It falls under HTS 2528.00.0050 as a calcined natural borate concentrate with less than 85% H3BO3 content on dry weight, excluding borates from brine. This classification covers unrefined mineral forms not chemically separated.
Natural Ulexite Borate Ore
Ulexite is a hydrated sodium calcium borate mineral mined as sodium borate ore, commonly used in fertilizers and fiberglass production. Classified in HTS 2528.00.0050 as a natural borate not from brine, with H3BO3 content below 85% dry weight. It remains in raw or concentrated form without chemical separation.
Priceite Calcium Borate Mineral
Priceite, a rare calcium borate (Ca4Mg2B10O23), occurs naturally and is concentrated for specialty glass and flux applications. It qualifies for HTS 2528.00.0050 as other natural borates not from brine, maintaining under 85% H3BO3 equivalence. Supplied in ground or lump form post-mining.
Kernite Sodium Borate Concentrate
Kernite is a natural sodium borate (Na2B4O7·4H2O) concentrate from evaporated lake beds, used in welding fluxes and herbicides. HTS 2528.00.0050 covers this non-brine natural borate with H3BO3 content below 85% dry weight. Typically exported as crushed or powdered ore.
Sassolite Natural Boric Acid Crystals
Sassolite consists of natural boric acid (H3BO3) crystals from volcanic fumaroles, capped at 85% purity for this category. Used in pharmaceuticals and antiseptics precursors. HTS 2528.00.0050 includes this as natural boric acid not exceeding the purity limit, distinct from synthetic.
Hydroboracite Borate Mineral Powder
Hydroboracite, a magnesium calcium borate, is ground into powder for enamel frits and insulation compounds. Classifies under HTS 2528.00.0050 as other natural borate concentrates from solid deposits, under 85% H3BO3 dry. Non-brine origin confirmed via mining records.