Certified Reference Material NIST SRM 1950 from Mexico
NIST Standard Reference Material 1950 containing certified concentrations of metabolites in human serum for calibration of clinical analyzers. Classified under HTS 3822.19.0080 as certified reference materials used as laboratory standards.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include NIST certificate of analysis and uncertainty values in customs declaration
• Declare exact certified analyte concentrations to avoid reclassification as biological specimens
• Verify chain of custody documentation for reference material integrity