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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If melted into finished glass articles
Glass in finished form including barium glass falls under Chapter 70.
If part of prepared glass frit mixtures
Frits containing barium compounds classify as chemical preparations.
If converted to barium nitrate for glass flux
Nitrate conversion shifts to specific barium salt headings.
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Import Tips & Compliance
• Supply glass manufacturer specs and test data confirming controlled calcination endpoints
• Declare intended glass formulation use to justify valuation based on industrial mineral pricing
• Monitor for partial conversion to oxide which requires separate declaration under 2816
Related Products 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.
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.