USP Lithium Carbonate for Thyroid Function Tests from Mexico
Pure USP-grade lithium carbonate used in laboratory reagents for thyroid hormone assays. HTS 2836.91.0010 due to USP specification for this chemically defined inorganic carbonate.
Duty Rate — Mexico → United States
3.7%
Rate breakdown
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Import Tips
• Label as lab chemical to avoid pharma drug scrutiny
• Include SDS with heavy metal limits
• Pitfall: retail packaging may trigger 3824 diagnostic reclass