Natural barium carbonate (witherite)
Natural barium sulphate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide of heading 28.16. > Natural barium carbonate (witherite) > Natural barium carbonate (witherite)
Duty Rate (from China)
Products classified under Tariff item 2511.20
Calcined Witherite for Glassmaking
Calcined natural witherite processed to meet glass industry standards for barium content, used to introduce BaO into glass formulations. This product retains its natural barium carbonate composition, as calcination does not fully decompose it to barium oxide, and it is not excluded by Chapter 25 notes.
2511.20.00Calcined Witherite Lumps
Witherite ore in lump form that has undergone thermal calcination to remove impurities while retaining its natural barium carbonate composition. This product falls under tariff item 2511.20.00 as calcined natural barium carbonate, provided the calcination does not convert it to barium oxide.
2511.20.00High-Grade Witherite Concentrate
Beneficiated witherite ore with elevated barium carbonate content, concentrated through flotation or other mechanical processes. This remains natural barium carbonate under tariff item 2511.20.00, as the concentration processes are permitted by Chapter 25 note 1.
2511.20.00Natural Witherite Pyrotechnic Grade
Fine-ground natural barium carbonate selected for purity for use in fireworks and signal flares, providing green coloration. This product is minimally processed and retains its natural mineral identity, qualifying under tariff item 2511.20.00.
2511.20.00Pharmaceutical Grade Witherite
Ultra-pure natural witherite meeting pharmacopeia standards for barium content, used as a raw material for radiopaque agents. This product is classified under tariff item 2511.20.00 as it is a natural mineral source, not yet formulated into a medicament.
2511.20.00Raw 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. This unprocessed witherite falls under tariff item 2511.20.00 as natural barium carbonate in its crude state.
2511.20.00Witherite Ceramic Flux
Calcined witherite prepared as a fluxing agent for ceramic bodies and glazes, lowering melting temperatures. This product retains its natural barium carbonate composition and is classified under tariff item 2511.20.00, as calcination is permitted and it is not excluded by Chapter 25 notes.
2511.20.00Witherite Drilling Grade Additive
Natural witherite processed to a specific particle size for use as a weighting agent in oil well drilling fluids. This product is unchanged natural barium carbonate, meeting industry specifications, and falls under tariff item 2511.20.00.
2511.20.00Witherite Mineral Powder
Ground natural witherite reduced to powder form after extraction and optional calcining, maintaining its barium carbonate mineral identity. This product is covered by tariff item 2511.20.00 as natural barium carbonate in any physical state, provided it is not processed beyond Chapter 25 note 1 limits.