Other organo-inorganic compounds — HTS 2931
Other organo-inorganic compounds
Chapter 29 › Heading 2931
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 2931 is a broad product category for “other organo-inorganic compounds.” It generally covers chemical compounds that contain both an organic component and an inorganic element or group, but that are not classified in more specific headings elsewhere in Chapter 29. The heading is not a single product code: it groups different chemical materials and types under one four-digit heading.
To reach the correct 8-digit HTSUS code, start with the compound’s precise chemical identity and review the subheadings and statistical breakouts under heading 2931. The lower-level descriptions commonly distinguish products by material, chemical type, or other stated characteristics. Classification can also depend on the compound’s composition, form, purity, use, and whether another HTS provision describes it more specifically. Confirm the result against the current HTSUS and, when the classification is uncertain, obtain customs-broker or ruling advice.
What to check
- Identify the compound by its accepted chemical name, molecular formula, CAS Registry Number, and composition—not only its trade name.
- Read every subheading under heading 2931 and compare the product with the exact material or chemical-type descriptions at the 6- and 8-digit levels.
- Check Chapter 29 notes, section and chapter exclusions, and headings that may describe the product more specifically before using heading 2931.
- Use the product’s technical data sheet, safety data sheet, certificate of analysis, and manufacturing information to verify composition, purity, and form.
- Confirm the selected code in the current HTSUS and seek a customs broker’s review or a binding ruling when the chemistry or competing classifications are unclear.
HTS heading 2931 summary
Other organo-inorganic compounds is a 4-digit product category containing 2 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.
Sub-categories
| Code | Description |
|---|---|
| 2931.90 | Other |
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 |
|---|---|---|---|---|
| 2931.10.00.00 👉 | Tetramethyl lead and tetraethyl lead | 3.7% | Free | 25% |
| 2931.20.00.00 👉 | Tributyltin compounds | 3.7% | 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 2931?
Other organo-inorganic compounds. 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.