CFC-114 Calibration Gas Standard from Mexico
Dichlorotetrafluoroethane in precise concentrations for gas chromatography calibration falls under HTS 2903.77.00.30 as a chemically defined compound per Chapter 29 note (a). Dissolved or mixed only as allowed in notes (d)-(g) for safety/transport. Used in environmental labs to calibrate ozone-depleting gas detectors.
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
• Provide NIST-traceable certificates of analysis to prove calibration-grade purity and concentration
• Declare cylinder specifications; DOT hazmat compliance is critical for compressed gas imports
• Avoid classification as mixtures if solvent is solely for transport per note (e)