HTS 3824.99.25Prepared binders for foundry molds or cores; chemical products and preparations of the chemical or allied industries (including those consisting of mixtures of natural products), not elsewhere specified or included:Other: Other: Other: Mixtures containing 5 percent or more by weight of one or more aromatic or modified aromatic substances: Aqueous mixtures of triphenyl sulfonium chloride, diphenyl (4-phenylthio)phenyl sulfonium chloride and (thiodi-4,1- phenylene)bis(diphenyl sulfonium) dichloride

What that translates to:Aqueous mixtures of three listed aryl sulfonium chlorides

Also written 38249925 or 3824.99.2500. Rates as CBP is collecting them today. Updated Oct 1, 2026.

Country of origin

Aqueous mixtures of three listed aryl sulfonium chlorides (HTS 3824.99.25) from China owe 44% in total duties as of Oct 1, 2026: a 6.5% regular duty plus a 12.5% forced-labor tariff (Section 301) and a 25% China tariff (Section 301).

Total duty rate44%That's $4,400 on a $10,000 shipment.

Forced-labor tariffSection 301, since Jul 24, 202612.5%

China tariffSection 301, since May 10, 201925%

Regular dutyBase rate (MFN) in the tariff schedule6.5%

Total duty44%

The forced-labor tariff may not apply. The legal text: “articles that are for use in pharmaceutical applications” (HTS 9903.05.89).

Court status: Challenged at the U.S. Court of International Trade in In re Section 301 Forced Labor Cases, Court No. 26-03555-3JP, before a three-judge panel. The plaintiffs, Learning Resources and others, have moved for judgment on the agency record, arguing that the action (91 FR 47318) exceeds USTR's statutory authority, is arbitrary and capricious, and is pretextual; 25 states, plaintiffs in Court No. 26-cv-03467-3JP, support them as amici (brief filed Sep 11, 2026). No ruling as of Oct 1, 2026, so the rate is unchanged.

Sources: USITC Harmonized Tariff Schedule, Revision 20 (2026); USTR, Notice of Actions in Section 301 Investigations (forced labor), 91 FR 47318, Jul 28, 2026; HTS 9903.05.31; USTR, Notice of Modification of Section 301 Action (List 3 raised to 25% from May 10, 2019), 84 FR 20459, May 9, 2019; HTS 9903.88.03.

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Official description

Prepared binders for foundry molds or cores; chemical products and preparations of the chemical or allied industries (including those consisting of mixtures of natural products), not elsewhere specified or included: Other: Other: Other: Mixtures containing 5 percent or more by weight of one or more aromatic or modified aromatic substances: Aqueous mixtures of triphenyl sulfonium chloride, diphenyl (4-phenylthio)phenyl sulfonium chloride and (thiodi-4,1- phenylene)bis(diphenyl sulfonium) dichloride

Legal text from the Harmonized Tariff Schedule, Revision 20 (2026), chapter 38: Miscellaneous chemical products.

Statistical lines

The 10-digit numbers used on entry paperwork. They share this code's duty rates.

3824.99.2500 (3824992500)Aqueous mixtures of triphenyl sulfonium chloride, diphenyl (4-phenylthio)phenyl sulfonium chloride and (thiodi-4,1- phenylene)bis(diphenyl sulfonium) dichloride · reported in kg

What changed for this code

Jul 24, 2026Forced-labor tariffs start on imports from 60 economies (Section 301)
Jul 22, 202625% Section 301 tariff on products of Brazil starts
Jan 1, 2026Section 301 tariff on Nicaragua starts at 0%, set to rise to 10% in 2027 and 15% in 2028

Questions about HTS 3824.99.25

What is the duty rate for HTS 3824.99.25?

The regular (column 1 general) rate printed in the tariff schedule is 6.5%. Goods from China owe 44% in total as of Oct 1, 2026, including any additional tariffs. Additional tariffs depend on the country of origin; choose one above to see its full rate.

Is HTS 3824.99.25 subject to Section 301 tariffs?

Yes, for goods from 85 countries and territories as of Oct 1, 2026, including Algeria, Angola, Argentina, Australia, Austria. Choose a country above to see the rate and any exemptions.

Is HTS 3824.99.25 subject to Section 232 tariffs?

No Section 232 tariff applies to HTS 3824.99.25 as of Oct 1, 2026, from any country of origin.

HTSLookup shows the duties CBP collects on this code by country of origin. Antidumping or countervailing duties may also apply to some exporters; they're set per company and aren't shown.