Other salts of inorganic acids or peroxoacids — HTS 2842
Other salts of inorganic acids or peroxoacids (including aluminosilicates whether or not chemically defined), other than azides
Chapter 28 › Heading 2842
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 2842 is a broad product category for certain salts of inorganic acids or peroxoacids that are not covered by more specific headings. It also includes aluminosilicates, whether or not they have a precisely defined chemical composition. Azides are excluded. A salt is generally a chemical compound formed when an acid reacts with a base; “peroxoacids” are acids containing an oxygen–oxygen peroxide bond.
The 4-digit heading is only the starting point. To reach the correct 8-digit HTSUS subheading, identify the product’s chemical identity and the more specific description that follows in the tariff schedule. Subheadings may distinguish products by material or chemical type, including the relevant salt, aluminosilicate, or other defined group. Classification can depend on composition, manufacturing form, and whether another heading describes the product more specifically.
What to check
- Obtain the product’s chemical name, formula, CAS information, and safety data sheet, and compare them with the tariff descriptions.
- Determine whether the product is an aluminosilicate, another inorganic-acid or peroxoacid salt, or an excluded azide.
- Read every level of the HTSUS hierarchy from heading to 8-digit subheading; do not choose based only on a trade name or marketing description.
- Check the product’s composition, purity, physical form, and any mixture or preparation details against the relevant legal notes and explanatory information.
- Ask a customs broker or request a binding classification decision when the chemistry is unclear or multiple subheadings appear plausible.
HTS heading 2842 summary
Other salts of inorganic acids or peroxoacids is a 4-digit product category containing 1 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 |
|---|---|
| 2842.90 | 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 |
|---|---|---|---|---|
| 2842.10.00.00 👉 | Double or complex silicates, including aluminosilicates whether or not chemically defined | 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 2842?
Other salts of inorganic acids or peroxoacids (including aluminosilicates whether or not chemically defined), other than azides. 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.