Helium-3
Isotopes other than those of heading 2844; compounds, inorganic or organic, of such isotopes, whether or not chemically defined: > Helium-3
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
Products classified under HTS 2845.40.00.00
Helium-3 Gas
Helium-3 is a rare stable isotope of helium used primarily in cryogenic research and neutron detection. It falls under HTS 2845.40.00.00 as a non-radioactive isotope distinct from those in heading 2844. This chemically defined isotope is typically supplied in gaseous form for scientific applications.
Enriched Helium-3 Isotope
Enriched Helium-3 refers to helium with artificially increased He-3 content beyond natural abundance (0.000137%). Classified in HTS 2845.40.00.00 per chapter notes for modified isotopic compositions excluding mono-isotopic natural states. Used in ultra-low temperature physics and quantum computing research.
Helium-3 Cryogenic Fluid
Liquefied Helium-3 used in dilution refrigerators to achieve millikelvin temperatures. This product is specifically the He-3 isotope under HTS 2845.40.00.00, meeting the definition of isotopes with modified composition. Essential for low-temperature physics experiments.
Helium-3 Neutron Detector Fill Gas
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.
Research Grade Helium-3
Ultra-pure Helium-3 (>99.9%) for university and national lab research in nuclear physics. HTS 2845.40.00.00 covers this non-radioactive isotope with enriched composition as per HTSUS notes. Supplied in small high-pressure cylinders.
Helium-3/Helium-4 Mixture (Dilution Grade)
Pre-mixed He-3/He-4 solution at ~3-10% He-3 concentration for dilution refrigerator stills. The isotopic content qualifies under HTS 2845.40.00.00 as enriched helium isotopes. Used directly in cryostats for phase separation cooling.
Helium-3 Polarized Gas
Spin-polarized Helium-3 gas used in neutron polarizers and MRI lung imaging research. Classifies as the isotope under HTS 2845.40.00.00 despite polarization, as it's chemically the same compound. Produced via optical pumping techniques.