Hafnium Sponge
Porous hafnium metal produced by reducing hafnium tetrachloride with magnesium, used in nuclear reactor control rods and aerospace alloys. Classified under HTS 8112.39.00.00 as 'other' hafnium not specified elsewhere in the hafnium heading, distinct from unwrought forms like powder or bars.
Import Duty Rates by Country of Origin
| Origin Country | MFN Rate | Ch.99 Surcharges | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | 4% | +35.0% | 39% |
| 🇲🇽Mexico | 4% | +10.0% | 14% |
| 🇨🇦Canada | 4% | +10.0% | 14% |
| 🇩🇪Germany | 4% | +10.0% | 14% |
| 🇯🇵Japan | 4% | +10.0% | 14% |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If in unwrought form like powder or granules
Unwrought hafnium (e.g., powder) falls under specific subheading 8112.11, while processed sponge is 'other'.
If chemically defined as hafnium compounds
Inorganic compounds of hafnium are classified in Chapter 28, not pure metal in Chapter 81.
If hafnium alloy tubes/pipes with fittings
Alloys with <99% hafnium are classified under Chapter 81 other base metal alloys.
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Import Tips & Compliance
• Obtain certificates of purity analysis confirming hafnium content exceeds 99% by weight to avoid alloy classification under Chapter 81
• Declare as 'other hafnium' with detailed chemical composition; misdeclaration as waste/scrap triggers different environmental regulations
• Ensure end-use documentation for nuclear-sensitive materials to comply with export control re-import requirements
Related Products under HTS 8112.39.00.00
Hafnium Master Alloy Ingot
Compact ingot of hafnium with trace elements for alloying in superalloys, used in jet turbine blades. Falls under HTS 8112.39.00.00 as 'other' articles of hafnium, provided hafnium content is ≥99% and not unwrought powder.
Hafnium Reactor Control Rod Segments
Machined hafnium segments for nuclear reactor control rods that absorb neutrons. Classified in HTS 8112.39.00.00 as 'other' hafnium articles due to specific nuclear fabrication beyond basic wrought forms.
Hafnium Evaporation Pellets
Small hafnium pellets used in vacuum deposition for thin-film coatings in semiconductors and optics. HTS 8112.39.00.00 covers these as 'other' hafnium articles, not basic unwrought powder.
Hafnium Wire for Additive Manufacturing
High-purity hafnium wire spooled for laser powder bed fusion in aerospace prototyping. Classified under HTS 8112.39.00.00 as 'other' wrought hafnium products beyond standard profiles.
Recovered Hafnium Machining Scrap
Clean hafnium turnings and chips from aerospace component machining, suitable for remelting. Under HTS 8112.39.00.00 as 'other' hafnium including processed scrap forms, separate from raw waste.
Hafnium Foil for Superalloy Cladding
Thin hafnium foil sheets used to clad nickel superalloy turbine blades for oxidation resistance. HTS 8112.39.00.00 for 'other' hafnium sheet/foil beyond basic thicknesses.