HFC-23 Calibration Gas Standard from Mexico
NIST-traceable calibration mixture containing known HFC-23 concentrations for greenhouse gas monitoring equipment. Classified under HTS 3827.59.00.00 as HFC mixture. Used by EPA-approved testing laboratories.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Include NIST certificate of analysis; verify cylinder pressure test dates; provide uncertainty budget for concentrations