Argon-38 Calibration Gas from Mexico
Stable isotope argon-38 gas mixture (trace levels) in 1-liter cylinders for mass spectrometry instrument calibration. HTS 2804.29.00 applies as rare gas standard reference material. Certified against NIST traceable standards.
Duty Rate — Mexico → United States
3.7%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Include NIST certificate of analysis; declare as reference standard for duty preference; pitfall is undervaluing based on trace isotope content