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HSChapter 28
U.S. imports of colloidal precious metals (HS 284310) totaled $2.6M in June 2026, traded with 8 countries.
Importers of Colloidal Precious Metals paid $16K in duties in June 2026 — an effective duty rate of 0.6% on $2.6M in dutiable value, based on actual customs collections rather than the published tariff schedule. Colloidal Precious Metals imports of $2.6M in June 2026 ran 307% above the year-to-date monthly average of $641K.
Last updated: June 2026 dataColloidal precious metals — suspensions of gold, silver, platinum, or other precious metals in nanoscale or sub-micron particle form — serve as critical inputs in electronics, catalysis, biomedical diagnostics, and specialty coatings. The entire heading is captured in a single 10-digit line (2843100000), simplifying classification but placing a premium on accurate product characterization to distinguish true colloids from solutions or compounds. Brazil and the United Kingdom are the leading US suppliers under this heading. Because colloidal precious metals are purely industrial chemical inputs, no mandatory admissibility agency review applies at the border.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
A colloid consists of discrete metallic particles dispersed in a medium without forming a true chemical bond with the carrier — the metal retains its elemental identity. Precious metal compounds, by contrast, involve chemical bonding and are classified under headings 2843.21–2843.90. If the product is a true ionic solution or a defined chemical salt, it would not qualify as colloidal under 2843.10.
Electronics manufacturers use colloidal gold and silver in conductive inks and printed circuit applications. Biomedical and diagnostics firms use colloidal gold as a labeling agent in lateral-flow assays. Catalysis and specialty coatings sectors also consume colloidal platinum-group metals as process catalysts or surface treatments.
Monthly import values over time
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| ITALY | $2.5M | -- | -$2.5M |
| GERMANY | -- | $458K | +$458K |
| BRAZIL | $86K | -- | -$86K |
| KOREA, SOUTH | -- | $28K | +$28K |
| CANADA | $6K | $15K | +$9K |
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2843100000 | COLLOIDAL PRECIOUS METALS | $2.6M | 0.61% | 99.77% | $16K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2843100000 | COLLOIDAL PRECIOUS METALS | $506K |
URANIUM ENRICHED IN U235 ETC. PLUTONIUM ETC.
HS 284420
ANHYDROUS AMMONIA
HS 281410
NATURAL URANIUM & COMPOUNDS, ALLOYS & CERAMICS ETC
HS 284410
TUNGSTATES (WOLFRAMATES)
HS 284180
ALLOYS, DISPERSIONS,ISOTOPES & COMPOUNDS NES
HS 284443
ALUMINUM OXIDE, EXCEPT ARTIFICIAL CORUNDUM, NESOI
HS 281820
| Port | Imports | Exports | Balance |
|---|---|---|---|
| ATLANTA, GA | $2.5M | -- | -$2.5M |
| CLEVELAND, OH | -- | $443K | +$443K |
| MIAMI INTERNATIONAL AIRPORT, FL | $86K | -- | -$86K |