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2845.40.00.00/Helium-3/Helium-4 Mixture (Dilution Grade)/Japan

Helium-3/Helium-4 Mixture (Dilution Grade) from Japan

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.

Duty Rate — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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Import Tips

• Specify exact molar ratio on invoice; use Dewar shipping with temp monitoring; verify mixture doesn't exceed chemical preparation thresholds