Tandom · Duty calculator
Add country and invoice value for the full duty stack — base + 301 + 232 + AD/CVD + fees.
HTS 3815.19.00.00 is the U.S. Harmonized Tariff Schedule classification for Reaction initiators, reaction accelerators and catalytic preparations, not elsewhere specified or included, other. It's a 10-digit statistical line in Chapter 38: Miscellaneous chemical products, Section VI: Products of the Chemical or Allied Industries, used by U.S. Customs and Border Protection to determine the duty rate at entry. 3 Chapter 99 tariff modifications currently stack on top of the base rate.
New to HTS codes? Read our guide on how HTS classification works →
Chapter 99 overlays that stack on the base rate
| Code | Authority | Rate |
|---|---|---|
| 9903.88.01 | section_301 | The duty provided in the applicable subheading plus 25% |
| 9903.88.15 | section_301 | The duty provided in the applicable subheading + 7.5% |
| 9903.88.69 | section_301 | The duty provided in the applicable subheading |
Past CBP decisions classifying real products under this HTS code. Useful precedent when classifying a similar product — each ruling shows how CBP interpreted the code for a specific case.
Protest and Application for Further Review of Protest No. 5301-20-103261; tariff classification of Unicat SR-110CX Zinc Oxide Adsorbent; application of Section 301 trade remedies
The tariff classification and country of origin of Spray Dried Copper Zeolite Catalysts from various countries; Article 509.
The tariff classification of various Rare Earth Oxide catalyst powders from China
The tariff classification of various rare Earth Oxide catalyst powders from China
The tariff classification of Carbon Sulfonyl Catalyst, Powder; Carbon Sulfonyl Catalyst, Pellets; and Potassium Methylate, 32% in Methanol, from Mexico.
Source: CBP CROSS (view all rulings on rulings.cbp.gov →)
HTS 3815.19.00.00 is the U.S. Harmonized Tariff Schedule classification for Reaction initiators, reaction accelerators and catalytic preparations, not elsewhere specified or included, other. It belongs to Chapter 38 of the HTSUS.
The general (Column 1) duty rate for HTS 3815.19.00.00 is Free. This is the most-favored-nation (MFN) rate that applies to imports from World Trade Organization member countries.
The Column 2 rate for HTS 3815.19.00.00 is 25%. This rate applies to imports from countries that do not have normal trade relations with the United States (currently Cuba and North Korea).
Yes — HTS 3815.19.00.00 is covered by section_301 provision 9903.88.01 (The duty provided in the applicable subheading plus 25%). 2 additional overlays also touch this code. Open the code page for the full overlay stack with effective dates and country scopes.
No active AD/CVD orders currently flag HTS 3815.19.00.00 in Tandom's catalog. Tandom monitors Federal Register notices daily; a flag will appear here within 24h of any new order's publication.
Tandom guides relevant to this code
What the 178 active Section 301 exclusions cover, how to claim 9903.88.69 on an entry, and what changes when the November 10, 2026 deadline passes.
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How to read, order, and report Chapter 99 HTS codes alongside the base classification on a US entry summary in 2026. The full stacking ladder for brokers and compliance teams.
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A working guide to the inputs, the layers, and the math behind a US entry summary in 2026. Written for brokers, forwarders, and importer compliance teams.
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Drop the Tandom Duty Calculator API into a TMS, broker software, or in-house ERP. Code samples, the response shape, and ACE reporting order, in 2026.
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What changed April 6, 2026, what stayed the same, and how to file a steel, aluminum, or copper line in ACE without leaving duty exposure on the table.
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Where trade compliance APIs fit in a broker's filing pipeline: HTS classification, duty calculation, AD/CVD scope match, and post-summary corrections.
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