HFC-23 Calibration Standard Gas from Mexico
Certified reference mixture containing known HFC-23 concentrations for environmental monitoring equipment calibration. Classifies under HTS 3827.51.00.00 as it features trifluoromethane without ozone-depleting substances.
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
• NIST-traceable certificates of analysis mandatory for standards
• ISO 17025 accreditation verification for calibration laboratories
• Concentration verification prevents misclassification as pure substance