Residual products of the chemical or allied industries — HTS 3825
Residual products of the chemical or allied industries, not elsewhere specified or included; municipal waste; sewage sludge; other wastes specified in note 6 to this chapter
Chapter 38 › Heading 3825
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 3825 is a broad category for certain residual products and wastes from chemical or related industrial processes that are not more specifically covered elsewhere in the tariff. It groups together several types of material, including municipal waste, sewage sludge, and other wastes described in the chapter notes. The heading is not a single product code or duty rate; the applicable classification depends on what the material is and how it is defined under the tariff.
To reach the correct 8-digit HTSUS code, start with the heading and then follow the applicable subheadings. The product is usually narrowed by its material or waste type—for example, whether it is municipal waste, sewage sludge, a chemical or allied-industry residual, or another waste covered by the relevant legal notes. Review the full wording of the subheading, the Chapter 38 notes, and any exclusions before selecting the code. If the material has unusual composition, hazardous characteristics, or a potential classification under another heading, a customs broker or binding-ruling process may be appropriate.
What to check
- Identify the material’s exact composition, source, and physical form; do not classify it only by a commercial product name.
- Check whether a more specific HTS heading describes the material before using heading 3825.
- Read the Chapter 38 notes, especially the note provisions defining which wastes are included or excluded.
- Compare the complete 8-digit subheading descriptions and any applicable statistical suffix information in the current HTSUS.
- Keep technical specifications, safety data, processing records, and intended use available to support the classification; seek broker or official ruling advice when the category is uncertain.
HTS heading 3825 summary
Residual products of the chemical or allied industries 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 |
|---|---|---|---|---|
| 3825.10.01.00 👉 | Municipal waste | Free | — | Free |
| 3825.20.00.00 👉 | Sewage sludge | Free | — | Free |
| 3825.30.00.00 👉 | Clinical waste | Free | — | Free |
| 3825.50.00.00 👉 | Wastes of metal-pickling liquors, hydraulic fluids, brake fluids and anti-freeze fluids | Free | — | Free |
| 3825.90.01.00 👉 | Other | Free | — | Free |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 3825?
Residual products of the chemical or allied industries, not elsewhere specified or included; municipal waste; sewage sludge; other wastes specified in note 6 to this chapter. 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.