HTS 3815.90.20 duty rate

Consisting wholly of inorganic substances: Of mercury or of molybdenum. General duty 2.8%; for goods of Chinese origin, general + Section 301 (+25%) comes to 27.8% before any other duties.

2.8%General (MFN) duty rate

List 3 +25%Section 301, products of China

27.8%General + Section 301 for China, ad valorem

18%Column 2 (Cuba, North Korea, Russia, Belarus)

Official USITC Harmonized Tariff Schedule, 2026HTSRev20 · data built 2026-10-02 · check on hts.usitc.gov

Tariff line	3815.90.20
Description	Reaction initiators, reaction accelerators and catalytic preparations, not elsewhere specified or included: › Other: › Consisting wholly of inorganic substances: › Of mercury or of molybdenum
General rate	2.8%
Special rate (trade programs)	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
Column 2 rate	18%
Units of quantity	kg
Section 301 (China)	List 3 +25%

Section 301 China tariffs on this line

Chapter 99 heading	List	Extra duty	Status
9903.88.03	List 3	+25%	in effect

2026 US–China tariff reduction lists: The US–China reduction lists are not published yet. Dutyfinch checks the Federal Register every day and flags each code as soon as the list appears.

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Nearby tariff lines

3815.11.00 · 3815.12.00 · 3815.19.00 · 3815.90.10 · 3815.90.30 · 3815.90.50

← 3815.90.10 · 3815.90.30 → · Heading 3815 · Chapter 38 · Chapter 38 rate summary

General information from the official US Harmonized Tariff Schedule (USITC) and Federal Register; not legal or customs advice. Section 232, IEEPA, antidumping/countervailing and other duties can also apply. Confirm classification and rates with CBP or a licensed customs broker before you file.