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.
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 high purity
Borates separated or purified beyond natural concentrate form move to Chapter 28 as inorganic chemicals.
If mixed with earth colors or other minerals
Blends with non-borate minerals like calcined earth colors fall under heading 2530 for mineral substances.
If processed into chemical preparations
Advanced processing into industrial preparations shifts from raw natural borates to Chapter 38.
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Import Tips & Compliance
• Verify H3BO3 content via lab analysis to confirm under 85% threshold; obtain mineral origin certificates to distinguish from synthetic borates
• Ensure proper packaging to prevent moisture reabsorption during shipping
Related Products under HTS 2528.00.00.50
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.
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.
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.