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U.S. exports of stable isotopes & their compounds (nesoi) (HS 284590) totaled $17.4M in July 2026.
Importers of Stable Isotopes & Their Compounds (NESOI) paid $480K in duties in July 2026 — an effective duty rate of 16% on $3.0M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataStable isotopes not covered by heading 2844 — such as carbon-13, nitrogen-15, oxygen-18, and deuterium-labeled compounds — serve as essential tracers in pharmaceutical development, metabolic research, and industrial process monitoring. A single 10-digit line (2845900100) captures both inorganic and organic compounds of these isotopes not elsewhere specified. Canada and the Netherlands are leading suppliers, reflecting the concentration of isotope enrichment and labeled-compound synthesis capacity in those markets.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
169 shipments/mo
The key is demonstrating that the product's commercial value derives from its isotopic enrichment rather than its base chemistry. A certificate of isotopic purity from the manufacturer, showing enrichment above natural abundance, supports classification here. If the compound is not isotopically enriched, it would normally fall under its base chemical heading in Chapter 28 or 29.
Stable isotope-labeled compounds used as active pharmaceutical ingredients or in clinical research may be subject to FDA review depending on their intended use. However, isotopes imported as research reagents or analytical standards generally enter as chemicals rather than drugs. End-use documentation clarifying research versus clinical application can help avoid delays at entry.
HSChapter 28
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Subheading 1 of 5 in heading 2845
Subheading 284590 · $10.0M of $11.5M
ImportsExports
Imports
$10.0MYoY · Pro
Exports
$17.4MYoY · Pro
12-mo low · imports
YoY · ProThrough July 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 | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2845900100 | Isotope Exc Hdg 2844; Compound Inorgan/Organ NESOI | $10.0M | 4.79% | 29.72% | $480K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2845900100 | Isotope Exc Hdg 2844; Compound Inorgan/Organ NESOI | $17.4M |
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 · July 2026
destination
China and Korea, South together take 53% of it.
customs district
origin
entry
rate provision · imports
69.5% enters free of duty; the effective duty rate is 4.79%.