U.S. imports of colloidal precious metals (HS 284310) totaled $31K in April 2026, traded with 8 countries.
Last updated: April 2026 dataColloidal dispersions of gold, silver, platinum, and other precious metals — where the metal exists as nanoscale particles suspended in a medium — serve advanced applications in diagnostics, catalysis, electronics, and specialty coatings. The entire heading resolves to a single 10-digit line (2843100000), and the high intrinsic value of the precious metal content means that accurate valuation and metal-content declarations are critical for customs compliance. Brazil leads US import supply, with the United Kingdom and Canada also among the primary sources. The nanoparticle form of these materials may also trigger review under emerging regulatory frameworks for nanomaterials.
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Valuation must reflect the transaction value of the entire preparation, including the precious metal content. Given price volatility, importers should document the metal concentration and the market price at the time of export to support accurate declared values.
Brazil is the leading supplier, followed by the United Kingdom and Canada. Spain and Italy are also among the notable sources under this heading.
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Exports
$397K
Imports: $31K to 8 countries
Surplus of $366K (net exporter)
Trade balance: surplus of $366K (net exporter)
YTD: $1.1M imported (April 2026)
7 shipments/month
Monthly import values over time
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
ALUMINUM OXIDE, EXCEPT ARTIFICIAL CORUNDUM, NESOI
HS 281820
SULFURIC ACID; OLEUM
HS 280700
Top U.S. entry points for this product, ranked by latest-month import value.