3910.00.00.00

Silicones in primary forms

Unit: kg Heading: 3910 Chapter: 39 As of June 9, 2026

Duty rates

Column 1 (General / MFN)

3%

Column 2 (Non-NTR)

25%

Column 1 (Special / FTA)

Free

Eligible

A*AUBHCLCODEILJOKKRMAOMPPAPESSG

The rates above are statutory column rates. Trade remedies in Chapter 99 (Section 301, 232, IEEPA, reciprocal) and FTA preferences can change the duty owed on a given entry — see below.

Trade measures (Chapter 99)

9903.90.08

35%

Articles the product of the Russian Federation, as provided for in U.S. note 30(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 30(b) to this subchapter

Applies to origin: RU, BY

Effective from April 5, 2025

9903.03.01

The duty provided in the applicable subheading + 10%

Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter

Effective from February 24, 2026 through July 24, 2026

9903.03.02

The duty provided in the applicable subheading

Articles the product of any country that (1) were loaded onto a vessel at the port of loading and in transit on the final mode of transit prior to entry into the United States, before 12:01 a.m. eastern standard time on February 24, 2026; and (2) are entered for consumption, or withdrawn from warehouse for consumption, before 12:01 a.m. eastern standard time on February 28, 2026

Effective from February 24, 2026 through July 24, 2026

9903.03.03

The duty provided in the applicable subheading

Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter

Effective from February 24, 2026 through July 24, 2026

9903.03.04

The duty provided in the applicable subheading

Articles the product of any country, as provided for in subdivision (aa)(iii) of U.S. note 2 to this subchapter

Effective from February 24, 2026 through July 24, 2026

9903.03.05

The duty provided in the applicable subheading

Articles of civil aircraft (all aircraft other than military aircraft); their engines, parts and components; their other parts, components and subassemblies; and ground flight simulators and their parts and components of any country, provided for in subdivision (aa)(iv) of U.S. note 2 to this subchapter

Effective from February 24, 2026 through July 24, 2026

9903.03.06

The duty provided in the applicable subheading

Articles of aluminum, of steel, or of copper or derivative aluminum or steel articles; passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans, and cargo vans) and light trucks; parts of passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans, and cargo vans) and light trucks; medium- and heavy-duty vehicles; parts of medium- and heavy-duty vehicles; wood products; and semiconductor articles, of any country, as provided in subdivision (aa)(v) of U.S. note 2 to this subchapter

Effective from February 24, 2026 through July 24, 2026

9903.03.07

The duty provided in the applicable subheading

Articles the product of Canada, as provided for in subdivision (aa)(vi) of U.S. note 2 to this subchapter

Applies to origin: CA

Effective from February 24, 2026 through July 24, 2026

9903.03.08

The duty provided in the applicable subheading

Articles the product of Mexico, as provided for in subdivision (aa)(vii) of U.S. note 2 to this subchapter

Applies to origin: MX

Effective from February 24, 2026 through July 24, 2026

9903.03.09

The duty provided in the applicable subheading

Articles of textiles or apparel the product of Costa Rica, the Dominican Republic, El Salvador, Guatemala, Honduras or Nicaragua, as provided for in subdivision (aa)(viii) of U.S. note 2 to this subchapter

Applies to origin: CR, SV, GT, HN, NI, DO

Effective from February 24, 2026 through July 24, 2026

9903.03.10

The duty provided in the applicable subheading

Articles that are donations, by persons subject to the jurisdiction of the United States, such as food, clothing and medicine, intended to be used to relieve human suffering

Effective from February 24, 2026 through July 24, 2026

9903.03.11

The duty provided in the applicable subheading

Articles that are informational materials, including but not limited to publications, films, posters, phonograph records, photographs, microfilms, microfiche, tapes, compact disks, CD ROMs, artworks and news wire feeds

Applies to origin: IL

Effective from February 24, 2026 through July 24, 2026

9903.88.02

LIST_1

The duty provided in the applicable subheading + 25%

Except as provided in headings 9903.88.12, 9903.88.17, 9903.88.20, 9903.88.54, 9903.88.59, 9903.88.61, 9903.88.63, 9903.88.66, 9903.88.67, 9903.88.68, 9903.88.69, or 9903.88.70, articles the product of China, as provided for in U.S. note 20(c) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(d)

Applies to origin: CN

Effective from August 23, 2018

Related CBP rulings

N359943 April 2, 2026

The tariff classification of silicone grease from Canada

The product under consideration is Item 501-00001-000.A1-Grease, Cable, Headband. The product is a silicone grease described as a translucent, hydrophobic, silicone dielectric compound. It is composed of over 90 percent poly(dimethyl siloxa

N359379 March 26, 2026

The tariff classification of silicone paste from Germany

The product under consideration is referred to as Otoform AK. The product is a silicone paste. It is packaged ready to use and packaged for direct sale. It will be used to take individual ear impressions of the external auditory canal and t

N327310 August 10, 2022

The tariff classification of silicone resin bead powder from Taiwan

GW-201NE-T and GW-504NE-T are composed of 100 percent polymethylsilsesquioxane (CAS No. 68554-70-1. The products are white silicone resin bead powders. The only difference between the two products are the micron size of the beads. GW-201NE-

N326189 June 2, 2022

The tariff classification and country of origin of bulk polydimethylsiloxane

The product under consideration is described as polydimethylsiloxane. It is composed of a mixture of linear and cyclic siloxanes. The final product contains no solvent or additives.

N323214 January 10, 2022

The country of origin of vacuum cleaners

presented in this case because the Vacuum Cleaners are neither wholly obtained or produced nor produced exclusively from “domestic” (Mexican, in this case) materials. Because the analysis of sections 102.11(a)(1) and 102.11(a)(2) does not y

N308628 January 16, 2020

The tariff classification of silicone gel cleaner from China

The product in question is described as stylus gel cleaner. It consists of 100 percent silicone gel in a plastic container. The product is marketed for cleaning the dust from a turntable stylus needle. The turntable stylus needle is dipped

N306159 September 26, 2019

The tariff classification of polymethyl hydride siloxane (CAS # 63148-57-2) from Hungary

The product is described as polymethyl hydride siloxane (CAS # 63148-57-2), a silicone organic liquid free of solvents.

N306218 September 26, 2019

The tariff classification of polydimethylsiloxane (CAS # 63148-62-9) from Hungary

The product is described as linear non-reactive polydimethylsiloxane, (CAS # 63148-62-9).

H192517 November 24, 2014

Revocation of New York Ruling N144035; Classification of Thermal Conductive Greases

The subject merchandise consists of five types of thermal conductive greases. These products, identified as X23-7783D, G751, X23-7756, X23-7762, and G765, are imported in the form of organopolysiloxane paste containing aluminum and zinc ox

H233041 April 1, 2014

Protest number 1704-11-100407; Generalized System of Preferences; Classification of Stone; Granite; Laboratory Analysis and Report; subheading 6902.93, HTSUS

The merchandise at issue is three types of stone imported from Brazil used as building materials for items such as kitchen counter tops. The specific stones at

N250341 March 14, 2014

Tariff classification of a silicon-based resin filled with glass microspheres from England.

Novolastic is a room-temperature vulcanizing silicone resin compounded with hollow glass microspheres designed to reduce density and lower thermal conductivity. The glass microspheres are relatively thick-walled and provide good crush stren

N234693 November 9, 2012

The tariff classification of silicone materials from the United Kingdom

Sample 1 is described as vulcanized silicone reinforced with glass fabric. The sample is in the form of a solid plastic sheet that incorporates a middle reinforcing layer of glass fabric. The vulcanizing agent is peroxide and the vulcanizin

Duty by origin country

The rate above is the statutory base. Total landed duty depends on origin — see the calculated rate for 3910.00.00.00 from each major US trading partner.

Need to defend this classification?

TariffLens generates GRI reasoning, cites the right CBP rulings, and builds the audit trail you need for reasonable care.

Book a demo →