U.S. exports of Colloidal Precious Metals (HS 284310) totaled $649K in August 2026.
Importers of Colloidal Precious Metals paid $34K in duties in August 2026, an average duty rate of 15.35% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Colloidal Precious Metals imports of $224K in August 2026 ran 57% below the year-to-date monthly average of $517K.
Last updated: August 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.
9 import shipments a month
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.
Subheading 5 of 5 in heading 2843
Subheading 284310 · $649K of $84.8M
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ImportsExports
Imports
$224KYoY · free account
Exports
$649KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $4.7M of Colloidal Precious Metals and exported $5.4M.
Through August 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2843100000 | Colloidal Precious Metals | $224K | 15.35% | 95.01% | $34K |
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 | $649K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Exports · August 2026
destination
Switzerland and Canada together take 92% of it.
customs district
origin
entry
rate provision · imports
5.0% enters free of duty; duty collected equals 15.35% of imports for consumption.