Silicates — HTS 2839
Silicates; commercial alkali metal silicates
Chapter 28 › Heading 2839
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 2839 is a broad product category for silicates and commercial alkali metal silicates. It generally covers chemical compounds or preparations in which silicon and oxygen are combined with another element, including commercially made silicates associated with alkali metals such as sodium or potassium. The heading is not a complete product description: the chemical identity, form, and intended use may affect classification.
To reach the correct 8-digit HTSUS code, start with the product’s actual composition and identify the applicable 4-digit heading, then follow the subheading structure under heading 2839. The narrower provisions commonly distinguish products by material or chemical type and may further separate forms or other specified characteristics. Use the current HTSUS wording, legal notes, and classification rules; if the product is a mixture, formulation, or specially prepared commercial product, customs-broker or binding-ruling guidance may be appropriate.
What to check
- Obtain the technical data sheet, safety data sheet, certificate of analysis, and ingredient or molecular-composition information.
- Confirm whether the product is a chemically defined silicate, a commercial alkali metal silicate, a mixture, or a preparation classified elsewhere.
- Match the product’s chemical name and relevant form or type to the exact subheading descriptions under heading 2839.
- Check the HTSUS section and chapter notes, unit-of-measure instructions, and any exclusions before selecting the 8-digit code.
- Document why the selected code fits the product, and seek customs-broker advice or a binding ruling when the composition or classification is uncertain.
HTS heading 2839 summary
Silicates 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 |
|---|---|
| 2839.90 | 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 |
|---|---|---|---|---|
| 2839.11.00.00 👉 | Sodium metasilicates | 1.1% | Free | 3% |
| 2839.19.00.00 👉 | Other | 1.1% | Free | 3% |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 2839?
Silicates; commercial alkali metal silicates. 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.