Helium-3/Helium-4 Hyperpure Mixture
A hyperpure helium mixture with He-3 isotopically enriched to >99% of helium content, used in dilution refrigerators for ultra-low temperature physics. It is an isotopically pure rare gas.
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 |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the helium mixture contains other gases beyond helium isotopes
Mixtures with other gases are classified under the heading for the predominant component or as a mixture.
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
• Confirm the helium-3 is not radioactive; radioactive isotopes fall under heading 28.44
• Provide a certificate of isotopic purity
• Ensure the mixture is for research purposes and meets any applicable regulations
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