Helium-3 Neutron Detector Fill Gas from Mexico
High-purity Helium-3 gas filled into detector tubes for thermal neutron detection in security and research. Classified as the isotope itself under HTS 2845.40.00.00, not as a finished detector. The isotope's neutron absorption properties drive its specialized use.
Duty Rate — Mexico → United States
10%
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
• Secure BIS export licenses if destined for sensitive end-uses; include neutron cross-section specs in docs; avoid packaging that implies finished detector assembly