Natural barium carbonate (witherite)
Natural barium sulfate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide of heading 2816: > Natural barium carbonate (witherite)
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 2511.20.00.00
Raw Witherite Ore
Natural barium carbonate ore extracted from mineral deposits, typically in lump or crushed form, used as a raw material for barium compound production. Classified under HTS 2511.20.00.00 as unprocessed natural witherite, whether or not calcined but excluding barium oxide. It serves as the primary source for industrial barium chemicals.
Calcined Witherite Lumps
Witherite ore that has undergone thermal calcination to remove impurities while retaining its natural barium carbonate composition in lump form. Falls under HTS 2511.20.00.00 as calcined natural barium carbonate, explicitly covered in the heading excluding only barium oxide. Primarily used in glass manufacturing and chemical synthesis.
Witherite Mineral Powder
Ground natural witherite reduced to powder form after extraction and optional calcining, maintaining its barium carbonate mineral identity. HTS 2511.20.00.00 covers this as natural barium carbonate in any physical state short of chemical alteration. Essential for drilling muds and pyrotechnics production.
High-Grade Witherite Concentrate
Beneficiated witherite ore with elevated barium carbonate content through natural separation processes like flotation, sold as concentrate. Remains under HTS 2511.20.00.00 as it's still natural mineral, not chemically synthesized. Used in specialty glass and ceramic frits.
Witherite Drilling Grade Additive
Natural witherite processed to specific particle size for use as a weighting agent in oil well drilling fluids. HTS 2511.20.00.00 applies as it's unchanged natural barium carbonate, meeting industry specs for density control. Key component in high-pressure drilling operations.
Calcined Witherite for Glassmaking
Specially calcined natural witherite meeting glass industry standards for barium content, used to introduce BaO into glass formulations. Covered by HTS 2511.20.00.00 as calcined witherite before full decomposition to oxide. Critical for optical and TV glass production.
Natural Witherite Pyrotechnic Grade
Fine-ground natural barium carbonate selected for purity in fireworks and signal flare production. HTS 2511.20.00.00 classification holds as it's minimally processed mineral for chemical reaction. Provides green coloration in pyrotechnic displays.
Witherite Ceramic Flux
Calcined witherite prepared as fluxing agent for ceramic bodies and glazes, lowering melting temperatures. Remains HTS 2511.20.00.00 as natural barium carbonate suitable for high-temperature decomposition in firing. Used in electrical porcelain and tile production.
Pharmaceutical Grade Witherite
Ultra-pure natural witherite meeting pharmacopeia standards for barium content, used as raw material for radiopaque agents. HTS 2511.20.00.00 applies pre-formulation as natural mineral source. Basis for barium meal contrast media.