Isotopes other than those of heading 2844 — HTS 2845
Isotopes other than those of heading 2844; compounds, inorganic or organic, of such isotopes, whether or not chemically defined
Chapter 28 › Heading 2845
2026 HTS Rev 19 Synced Rules verified Operational
Written to help non-specialists understand this page. Rates, dates, and legal facts come from the official records above and on the linked source.
HTS heading 2845 covers isotopes other than those classified in heading 2844, plus inorganic or organic compounds made from those isotopes. An isotope is a form of an element with the same chemical identity but a different atomic mass. The heading can therefore cover the isotope itself and certain compounds containing it, whether or not the compound has a fully defined chemical formula.
The 4-digit heading is only a broad category, not the final tariff classification. To reach the correct 8-digit HTSUS code, first identify the actual material: the isotope or isotopic compound, its chemical form, and any description used in the subheadings. Then compare the product’s composition and intended presentation with the relevant 6-digit and 8-digit provisions. Confirm that the product belongs in heading 2845 rather than heading 2844, which covers specified radioactive isotopes and related products, or another heading based on the product’s use or form.
What to check
- Check the exact isotope, elemental composition, and chemical formula shown on the specification sheet or certificate of analysis.
- Determine whether the item is an isotope, an inorganic compound, or an organic compound, and identify its physical form and concentration.
- Read the 6-digit and 8-digit subheadings in the current HTSUS; do not stop at heading 2845 or rely only on a product description.
- Verify whether the isotope is excluded because it falls within heading 2844 or another more specific tariff provision.
- Request a binding classification ruling or consult a licensed customs broker when the isotope, compound, or heading choice is unclear.
HTS heading 2845 summary
Isotopes other than those of heading 2844 is a 4-digit product category containing 5 published product-code lines in this snapshot. A heading does not carry one universal duty rate; classification must be narrowed to the line matching the product facts.
How to find your code in this category
A heading is a product category. To get the exact duty, narrow from this 4-digit heading to a sub-category (usually by material), then open the 8-digit code that matches your product.
Open any code in the tables below to see its exact duty rate, a duty calculator (enter your shipment value → estimated duty and landed cost), the rate-change history chart, and the country-by-country breakdown (including Section 301/232 add-on duties).
Why you have to click in: a single category can contain products with very different duties. The rate depends on the specific product — its material and construction — and on the country of origin, and those only get pinned down at the 8-digit code level. That is why this page points you to codes instead of showing one rate for the whole category.
Product codes & duty rates
👇 Each row is a specific product code — click a blue code to open its full page with exact duty rates by country, the rate-history chart, and a duty calculator. 👉
| Code | Description | General (MFN) | Special | Column 2 |
|---|---|---|---|---|
| 2845.10.00.00 👉 | Heavy water (Deuterium oxide) | Free | — | 25% |
| 2845.20.00.00 👉 | Boron enriched in boron-10 and its compounds | Free | — | 25% |
| 2845.30.00.00 👉 | Lithium enriched in lithium-6 and its compounds | Free | — | 25% |
| 2845.40.00.00 👉 | Helium-3 | Free | — | 25% |
| 2845.90.01.00 👉 | Other | Free | — | 25% |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 2845?
Isotopes other than those of heading 2844; compounds, inorganic or organic, of such isotopes, whether or not chemically defined. To classify a specific item you must pick the matching sub-category and 8-digit code above; the right choice usually depends on the material and construction of the product.
How do I choose the right code within this category?
Start from the sub-categories (typically divided by material—for example cotton versus man-made fibers), then open the active 8- or 10-digit code that matches the product. When unsure, a licensed customs broker or a CBP binding ruling can confirm the classification.
Reference information only, not customs, legal, or classification advice. Confirm the current code and rate against the official HTS before you import.