Calcined Witherite for Glassmaking from Mexico
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.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• 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