Helium-3/Helium-4 Mixture (Dilution Grade)
> Helium-3/Helium-4 mixture (dilution grade) is a pre-mixed solution with 3-10% helium-3 concentration, used in dilution refrigerator stills. The isotopic content qualifies as enriched helium isotopes under tariff item 2845.40.00. It is used directly in cryostats for phase separation and cooling.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the mixture is natural helium with no enrichment
Natural helium mixtures are classified under heading 28.04.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• > Clearly state the isotopic composition and concentration on the commercial invoice
• Ensure the mixture is classified as an isotope compound, not a natural gas mixture
• Verify that the product meets Canadian safety standards for pressurized gases and obtain any required permits
Related Products under Tariff item 2845.40.00
Enriched Helium-3 Isotope
> Enriched Helium-3 is helium gas with an artificially increased concentration of the helium-3 isotope beyond its natural abundance. It is classified under tariff item 2845.40.00 as a non-radioactive isotope of helium, distinct from radioactive isotopes of heading 28.44. The enrichment process modifies the isotopic composition, making it a separate chemically defined isotope.
Helium-3 Cryogenic Fluid
> Helium-3 cryogenic fluid is helium-3 in liquefied form, used in dilution refrigerators to reach millikelvin temperatures. It is the helium-3 isotope itself, meeting the definition of an isotope with modified composition. This product falls under tariff item 2845.40.00 as a non-radioactive isotope.
Helium-3 Gas
> Helium-3 gas is a rare, stable isotope of helium used in cryogenic research and neutron detection. It is a non-radioactive isotope, distinct from those in heading 28.44, and is classified under tariff item 2845.40.00. The gas is supplied in high-pressure cylinders for various applications.
Helium-3 Neutron Detector Fill Gas
> Helium-3 neutron detector fill gas is high-purity helium-3 gas filled into detector tubes for thermal neutron detection. It is classified as the isotope itself under tariff item 2845.40.00, not as a finished detector. The isotope's neutron absorption properties make it essential for security and research applications.
Helium-3 Polarized Gas
> Helium-3 polarized gas is spin-polarized helium-3 used in neutron polarizers and MRI lung imaging research. It is chemically the same isotope and falls under tariff item 2845.40.00 despite the polarization. The product is produced via optical pumping and retains its isotopic identity.
Research Grade Helium-3
> Research grade helium-3 is ultra-pure helium-3 (>99.9%) for university and national lab research in nuclear physics. It is a non-radioactive isotope with enriched composition, classified under tariff item 2845.40.00. Supplied in small high-pressure cylinders for specialized applications.