HFC-227ea Calibration Gas Standard from Mexico
Certified reference HFC-227ea gas mixtures at ppb/ppm levels in nitrogen balance for atmospheric monitoring and gas chromatography calibration. Pure component classified under HTS 2903.46.10.00 with trace analysis certificate. NIST-traceable concentration verification.
Duty Rate — Mexico → United States
13.7%
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
• Certificate of analysis with uncertainty budget (<2% relative) required
• Cylinder pressure test certification (DOT-3AA) mandatory for calibration gases
• Shelf life expiration dates must be current for reference standards