Esters of other inorganic acids of nonmetals — HTS 2920
Esters of other inorganic acids of nonmetals (excluding esters of hydrogen halides) and their salts; their halogenated, sulfonated, nitrated or nitrosated derivatives
Chapter 29 › Heading 2920
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 2920 is a broad product category for certain esters of inorganic acids made from nonmetals, along with their salts and chemically modified derivatives. In plain language, it generally covers compounds formed when an inorganic, nonmetal acid is converted into an ester, plus versions that are halogenated, sulfonated, nitrated, or nitrosated. Esters of hydrogen halides are excluded. The heading can include standalone chemicals, mixtures or formulations only when the tariff structure and product facts support that treatment.
The 4-digit heading is only the starting point. To reach the correct 8-digit HTSUS code, follow the subheadings under heading 2920 and compare the product’s exact chemical identity and form with the legal descriptions. The deciding distinction is often the specific material or chemical type, such as the relevant acid derivative, salt, or modified compound—not its trade name or intended use alone. Classification may require a customs broker or chemist when the composition or chemical terminology is unclear.
What to check
- Obtain the complete chemical name, molecular formula, CAS Registry Number, purity, and whether the item is a salt, mixture, or solution.
- Read every subheading and statistical suffix under heading 2920; do not stop at the 4-digit heading or choose by product name alone.
- Check whether the product is an ester of a qualifying inorganic acid of a nonmetal, and confirm that it is not an excluded hydrogen-halide ester.
- Identify any halogenated, sulfonated, nitrated, or nitrosated derivative and compare that feature with the subheading wording.
- Keep the safety data sheet, technical data sheet, supplier declaration, and any prior binding classification ruling; request professional review if the chemistry does not clearly match one subheading.
HTS heading 2920 summary
Esters of other inorganic acids of nonmetals is a 4-digit product category containing 7 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 |
|---|---|
| 2920.19 | Other |
| 2920.90 | 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 |
|---|---|---|---|---|
| 2920.11.00.00 👉 | Parathion (ISO) and parathion-methyl (ISO) (methyl-parathion) | Free | — | 15.4¢/kg + 64.5% |
| 2920.21.00.00 👉 | Dimethyl phosphite | 3.7% | Free | 25% |
| 2920.22.00.00 👉 | Diethyl phosphite | 3.7% | Free | 25% |
| 2920.23.00.00 👉 | Trimethyl phosphite | 3.7% | Free | 25% |
| 2920.24.00.00 👉 | Triethyl phosphite | 3.7% | Free | 25% |
| 2920.29.00.00 👉 | Other | 3.7% | Free | 25% |
| 2920.30.00.00 👉 | Endosulfan (ISO) | 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 2920?
Esters of other inorganic acids of nonmetals (excluding esters of hydrogen halides) and their salts; their halogenated, sulfonated, nitrated or nitrosated derivatives. 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.