Tungsten Molybdate Catalyst Precursor
Ammonium metatungstate and molybdate blend serving as precursor for hydrodesulfurization catalysts in oil refining. Inorganic salts mixture activated at high temperatures. Fits 3824.99.3500 as unspecified tungsten inorganic mixtures.
Import Duty Rates by Country of Origin
| Origin Country | MFN Rate | Ch.99 Surcharges | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | 6.5% | +35.0% | 41.5% |
| 🇲🇽Mexico | 6.5% | +10.0% | 16.5% |
| 🇨🇦Canada | 6.5% | +10.0% | 16.5% |
| 🇩🇪Germany | 6.5% | +10.0% | 16.5% |
| 🇯🇵Japan | 6.5% | +10.0% | 16.5% |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If pure ammonium paratungstate
Single tungsten salts like APT classify under specific tungstates in 2841.
If other inorganic mixtures without tungsten
Non-tungsten inorganic mixes fall under the general inorganic mixtures subheading.
If oil-containing catalyst carrier
Petroleum oil content >70% shifts to Chapter 27 oil mixtures.
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Import Tips & Compliance
• Certify as catalyst precursor with activation process details for proper heading
• Monitor REACH-like restrictions on molybdenum-tungsten compounds
• Package in moisture-proof containers to maintain mixture stability during import
Related Products under HTS 3824.99.35.00
Tungsten Silicate Binder for Foundry Molds
A mixture of sodium silicate and tungsten compounds used as a binder in foundry mold production. It provides high-temperature resistance and strength for sand cores in metal casting. Classified under 3824.99.3500 as a mixture of two or more inorganic compounds containing tungsten, specifically for foundry applications.
Tungsten Phosphoric Acid Mixture for Catalysts
A chemical preparation combining phosphotungstic acid with other inorganic phosphates for industrial catalyst applications. Used in petroleum refining and chemical synthesis processes. Falls under 3824.99.3500 due to its inorganic tungsten compound mixture not specified elsewhere.
Tungsten Zirconium Oxide Dispersion
An aqueous dispersion of tungsten oxide and zirconium oxide nanoparticles for ceramic coatings and high-temperature applications. Provides thermal barrier properties in foundry and aerospace components. Classified in 3824.99.3500 as a mixture of inorganic tungsten compounds.
Sodium Tungstate Borate Flux Mixture
A fused mixture of sodium tungstate and borates used as soldering flux in electronics and metal joining. Enhances wetting and corrosion resistance in high-temperature applications. Under 3824.99.3500 for inorganic tungsten compound mixtures.
Tungsten Carbide Slurry for Coatings
Aqueous slurry of tungsten carbide powder mixed with inorganic suspending agents for thermal spray coatings. Applied to wear-resistant surfaces in mining equipment. 3824.99.3500 covers this inorganic tungsten compound preparation.
Tungsten Oxide Vanadate Mixture
Mixed metal oxide powder of tungsten trioxide and vanadium pentoxide for selective catalytic reduction (SCR) systems in emissions control. Inorganic catalyst base material. Classified under 3824.99.3500 for tungsten-containing inorganic mixtures.