High-Purity Barium Carbonate for Optical Glass from Mexico
Ultra-high purity barium carbonate (>99.9%) is essential for manufacturing high-refractive index optical glass like barium flint. Classified under HTS 2836.60.00.00 as a pure inorganic carbonate per Note 1 to Chapter 28 definitions.
Duty Rate — Mexico → United States
2.3%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Provide trace metal analysis to prove optical grade; cleanroom packaging required
• Common issue: impurities shifting to general chemical preps in 3824