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HSChapter 28
U.S. imports of stable isotopes & their compounds (nesoi) (HS 284590) totaled $6.7M in April 2026, traded with 21 countries.
Importers of Stable Isotopes & Their Compounds (NESOI) paid $12K in duties in April 2026 — an effective duty rate of 17% on $69K in dutiable value, based on actual customs collections rather than the published tariff schedule. Stable Isotopes & Their Compounds (NESOI) imports of $6.7M in April 2026 ran 23% below the year-to-date monthly average of $8.7M.
Last updated: April 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.
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.
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Monthly import values over time
| Country | Imports | Exports | Balance |
|---|---|---|---|
| KOREA, SOUTH | -- | $8.6M | +$8.6M |
| CHINA | $83K | $4.4M | +$4.3M |
| GERMANY | $458K | $2.1M | +$1.7M |
| JAPAN | $862K | $1.4M | +$496K |
| INDIA | $2.1M | $42K | -$2.0M |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2845900100 | ISOTOPE EXC HDG 2844; COMPOUND INORGAN/ORGAN NESOI | $6.7M | 16.75% | $12K |
ISOTOPE EXC HDG 2844; COMPOUND INORGAN/ORGAN NESOI
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2845900100 | ISOTOPE EXC HDG 2844; COMPOUND INORGAN/ORGAN NESOI | $20.6M |
ISOTOPE EXC HDG 2844; COMPOUND INORGAN/ORGAN NESOI
81.2K kg
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
| State | Imports | Exports | Balance |
|---|---|---|---|
| Massachusetts | $796K | $5.4M | +$4.6M |
| Ohio | $1.2M | $4.8M | +$3.7M |
| North Carolina | $42K | $2.9M | +$2.8M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| JFK INTERNATIONAL AIRPORT, NY | $918K | $3.7M | +$2.8M |
| NEW ORLEANS, LA | $2.3M | $1.0M | -$1.3M |
| NORFOLK-NEWPORT NEWS, VA | -- | $2.7M | +$2.7M |