Silicotungstic Acid Hydrate
Silicotungstic acid hydrate (H4SiW12O40·xH2O) functions as a catalyst in esterification, under HTS 2841.80.00 for its tungstate core structure. Green acid catalyst.
Import Duty Rates by Country of Origin
| Origin Country | MFN Rate | Ch.99 Surcharges | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | 5.5% | +25.0% | 30.5% |
| 🇲🇽Mexico | 5.5% | — | 5.5% |
| 🇨🇦Canada | 5.5% | — | 5.5% |
| 🇩🇪Germany | 5.5% | — | 5.5% |
| 🇯🇵Japan | 5.5% | — | 5.5% |
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 free acid form
Simple tungstic acid classifies under oxides heading.
If silicate misclassification
Silica framework emphasis shifts to silicates.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Keggin structure verification via Raman spectroscopy
• Corrosive strong acid; UN 3260 proper shipping name
• Calcined vs hydrate forms distinguished by TGA
Related Products under HTS 2841.80.00
Sodium Tungstate Dihydrate
Sodium tungstate dihydrate (Na2WO4·2H2O) is a white crystalline salt derived from tungstic acid, classified under HTS 2841.80.00 as a tungstate of an inorganic base. It is commonly used in the production of tungsten metal, fireproofing textiles, and as a catalyst in chemical processes.
Ammonium Tungstate Powder
Ammonium tungstate ((NH4)10W12O41·5H2O) is an ammonium salt of tungstic acid, falling under HTS 2841.80.00 for tungstates. It serves as a precursor in tungsten carbide production for cutting tools and as a source of tungsten in pigments.
Potassium Tungstate Crystals
Potassium tungstate (K2WO4) consists of large colorless crystals used in X-ray fluorescence standards and glass manufacturing. It is classified in HTS 2841.80.00 as a tungstate salt of an alkali metal base.
Calcium Tungstate Powder
Calcium tungstate (CaWO4) powder is a scintillator material used in medical imaging detectors, classified under HTS 2841.80.00 as an alkaline earth tungstate. Its high density makes it ideal for radiation detection.
Disodium Tungstate Anhydrous
Disodium tungstate anhydrous (Na2WO4) is a high-purity reagent for laboratory use in protein crystallization and corrosion inhibition. HTS 2841.80.00 covers this alkali metal tungstate salt.
Magnesium Tungstate Luminescent Grade
Magnesium tungstate (MgWO4) of luminescent grade is used in fluorescent screens and lamps, classified as a tungstate under HTS 2841.80.00. It emits blue light under electron excitation.