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HSChapter 28
U.S. exports of heavy water (deuterium oxide) (HS 284510) totaled $806K in July 2026.
Importers of Heavy Water (Deuterium Oxide) paid $24K in duties in July 2026 — an effective duty rate of 10% on $244K in dutiable value, based on actual customs collections rather than the published tariff schedule. Heavy Water (Deuterium Oxide) imports of $271K in July 2026 ran 88% below the year-to-date monthly average of $2.3M.
Last updated: July 2026 dataDeuterium oxide — commercially known as heavy water — is a critical moderator and coolant in CANDU-type nuclear reactors and a controlled substance under nuclear nonproliferation frameworks, making its import subject to NRC licensing and export control scrutiny in both origin and destination countries. Classified under a single 10-digit line (2845100000), it is distinct from deuterium gas and other deuterium-enriched compounds. Canada has historically been the dominant global producer and the leading US supplier, a position rooted in its CANDU reactor program and dedicated heavy water production facilities.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
10 shipments/mo
Heavy water can moderate nuclear reactors in ways that enable plutonium production, making it a dual-use material monitored under the Nuclear Suppliers Group (NSG) guidelines and subject to NRC import licensing. Importers must demonstrate end-use legitimacy, and re-export is separately controlled.
HTS 2845100000 covers only deuterium oxide (D₂O) in its water form. Deuterium gas, deuterium-enriched compounds, and other isotopically modified substances fall under different lines within heading 2845. The physical form and isotopic concentration documented in the supplier's certificate of analysis are key to correct classification.
Subheading 3 of 5 in heading 2845
Subheading 284510 · $271K of $11.5M
Supplier Network
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ImportsExports
Imports
$271KYoY · Pro
Exports
$806KYoY · 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 |
|---|---|---|---|---|---|
| 2845100000 | Heavy Water (Deuterium Oxide) | $271K | 9.02% | 90.23% | $24K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2845100000 | Heavy Water (Deuterium Oxide) | $806K |
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
Japan and Germany together take 58% of it.
customs district
origin
entry
rate provision · imports
9.8% enters free of duty; the effective duty rate is 9.02%.