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HSChapter 28
U.S. imports of tungstates (wolframates) (HS 284180) totaled $17.2M in April 2026, traded with 9 countries.
Importers of Tungstates (Wolframates) paid $2.7M in duties in April 2026 — an effective duty rate of 15% on $18.1M in dutiable value, based on actual customs collections rather than the published tariff schedule. Tungstates (Wolframates) imports of $17.2M in April 2026 ran 80% above the year-to-date monthly average of $9.6M.
Last updated: April 2026 dataTungstates — also known by the older name wolframates — supply soluble tungsten to hard-metal, electronics, and phosphor manufacturing industries, with ammonium paratungstate (APT) being the most widely traded form. China dominates global tungstate supply and is the leading US import source under this heading, which the US schedule subdivides into ammonium (2841800010), calcium (2841800020), and other tungstate forms (2841800040, 2841800050). Shipments from China are subject to Section 301 tariffs, a significant cost consideration for downstream hard-metal and tooling manufacturers.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Classification follows the cation: ammonium tungstates (including APT) use 2841800010, calcium tungstate uses 2841800020, and all other tungstates not of ammonium fall under 2841800040 or the residual line 2841800050. The supplier's chemical name and formula on the certificate of analysis are the primary classification evidence; trade names alone are insufficient.
China controls a large share of global tungsten mining and processing, making US hard-metal and electronics manufacturers heavily dependent on Chinese-origin APT and other tungstates. Combined with Section 301 tariff exposure, this concentration has prompted some buyers to qualify alternative sources in Taiwan and Germany, though at higher cost and lower volume availability.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2841800010 | TUNGSTATES (WOLFRAMATE) OF AMMONIUM (TUNGSTEN CNT) | $10.7M | 21.04% | $2.3M |
| 2841800050 | TUNGSTATES (WOLFRAMATES) (TUNGSTEN CNT), NESOI | $6.5M | 5.32% | $395K |
| 2841800020 | TUNGSTATES (WOLFRAMATES) OF CALCIUM (TUNGSTEN CNT) | $0 | -- | -- |
TUNGSTATES (WOLFRAMATE) OF AMMONIUM (TUNGSTEN CNT)
TUNGSTATES (WOLFRAMATES) (TUNGSTEN CNT), NESOI
TUNGSTATES (WOLFRAMATES) OF CALCIUM (TUNGSTEN CNT)
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2841800010 | TUNGSTATES (WOLFRAMATE) OF AMMONIUM (TUNGSTEN CNT) | $589K |
| 2841800040 | TUNGSTATE (WOLFRAMATE), EXCEPT OF AMMONIUM | $15K |
TUNGSTATES (WOLFRAMATE) OF AMMONIUM (TUNGSTEN CNT)
66.8K ckg
TUNGSTATE (WOLFRAMATE), EXCEPT OF AMMONIUM
48 ckg
URANIUM ENRICHED IN U235 ETC. PLUTONIUM ETC.
HS 284420
NATURAL URANIUM & COMPOUNDS, ALLOYS & CERAMICS ETC
HS 284410
ANHYDROUS AMMONIA
HS 281410
ALLOYS, DISPERSIONS,ISOTOPES & COMPOUNDS NES
HS 284443
SILICON, UNDER 99.99% (BY WEIGHT) SILICON
HS 280469
PHOSPHORIC ACID AND POLYPHOSPHORIC ACIDS
HS 280920
| Port | Imports | Exports | Balance |
|---|---|---|---|
| CHICAGO, IL | $7.2M | -- | -$7.2M |
| SAVANNAH, GA | $5.8M | -- | -$5.8M |
| NEWARK, NJ | $2.7M | -- | -$2.7M |