# United States tariff line 2931.90.90.10: Organo-silicon compounds > In the United States tariff, line 2931.90.90.10 covers organo-silicon compounds. The general (MFN) duty rate is 3.7%. It falls under HS subheading 2931.90 in heading 29.31 (chapter 29). Source: https://border.bot/countries/united-states/hs-codes/2931909010 Last updated: 9 October 2026 [Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 29](https://border.bot/countries/united-states/hs-codes/29) / [2931.90](https://border.bot/countries/united-states/hs-codes/293190) / [2931.90.90.10](https://border.bot/countries/united-states/hs-codes/2931909010) ## Key facts - Tariff line: 2931.90.90.10 - Covers: Organo-silicon compounds - Duty (MFN): 3.7% - Preferential rates: From free (17 programmes or origins) - Additional duties: None recorded - Restrictions: None recorded - Tariff: [United States](https://border.bot/countries/united-states) - HS subheading: [2931.90](https://border.bot/hs-codes/293190) ## What this line covers In the United States tariff, line 2931.90.90.10 covers organo-silicon compounds. Its legal text is “Organo-silicon compounds”, read under “Other”, “Other” and “Other”. Products commonly classified here include Sodium hydrogen methylarsonate (CAS No. 2163-80-6), Tetrakis(hydroxymethyl)phosphonium chloride (CAS No. 124-64-1), Tetrakis(hydroxymethyl)phosphonium sulfate (CAS No. 55566-30-8), N-(Phosphonomethyl)glycine (Glyphosate) (CAS No. 1071-83-6) and Bis[(2,2-dimethyloctanoyl)oxy](dimethyl)stannane (CAS No. 68928-76-7) (border.bot’s search keywords, not legal text). ## How it is structured It falls under HS subheading 2931.90 in heading 29.31 (chapter 29). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff. - Chapter 29: Organic chemicals - Heading 29.31: Other organo-inorganic compounds - Subheading 2931.90: Other - Within the subheading: Other - Within the subheading: Other - Line 2931.90.90.10: Organo-silicon compounds ## Duty The general (MFN) duty rate is 3.7%. The rate is published on 2931.90.90. Duty-free entry applies to goods that qualify under 16 programmes, and to goods from a group of origins (origin group A*). - Free: a group of origins (origin group A*) (A*) - Free: United States-Australia Free Trade Agreement (AU) - Free: United States-Bahrain Free Trade Agreement Implementation Act (BH) - Free: United States-Chile Free Trade Agreement (CL) - Free: United States-Colombia Trade Promotion Agreement Implementation Act (CO) - Free: African Growth and Opportunity Act (D) - Free: Caribbean Basin Economic Recovery Act (E) - Free: United States-Israel Free Trade Area (IL) - Free: United States-Jordan Free Trade Area Implementation Act (JO) - Free: United States-Korea Free Trade Agreement Implementation Act (KR) - Free: United States-Morocco Free Trade Agreement Implementation Act (MA) - Free: United States-Oman Free Trade Agreement Implementation Act (OM) - Free: Dominican Republic-Central America-United States Free Trade Agreement (P) - Free: United States-Panama Trade Promotion Agreement Implementation Act (PA) - Free: United States-Peru Trade Promotion Agreement Implementation Act (PE) - Free: United States-Mexico-Canada Agreement (S) - Free: United States-Singapore Free Trade Agreement (SG) ## In other countries No other national tariff on border.bot has live lines under 2931.90 yet. - [The Harmonized System text for 2931.90](https://border.bot/hs-codes/293190) ## Other lines under 2931.90 - [2931.90.05.00](https://border.bot/countries/united-states/hs-codes/2931900500) Diphenyldichlorosilane; and phenyltrichlorosilane - [2931.90.10.00](https://border.bot/countries/united-states/hs-codes/2931901000) 4,4'-Diphenylbisphosphonous acid, di(2',2",4',4"-di-tert-butyl)phenyl ester - [2931.90.15.00](https://border.bot/countries/united-states/hs-codes/2931901500) Sodium tetraphenylboron - [2931.90.22.00](https://border.bot/countries/united-states/hs-codes/2931902200) Drugs - [2931.90.26.00](https://border.bot/countries/united-states/hs-codes/2931902600) Pesticides - [2931.90.30.00](https://border.bot/countries/united-states/hs-codes/2931903000) Products described in additional U.S. note 3 to section VI - [2931.90.60.00](https://border.bot/countries/united-states/hs-codes/2931906000) Other - [2931.90.70.00](https://border.bot/countries/united-states/hs-codes/2931907000) N,N'-Bis(trimethylsilyl) urea; 3-(Hydroxymethylphosphinyl)-1-propanoic acid, 2-hydroxyethyl ester; and 2-Phosphonobutane-1,2,4-tricarboxylic acid and its salts - [2931.90.90.21](https://border.bot/countries/united-states/hs-codes/2931909021) Dibutyltin oxide - [2931.90.90.25](https://border.bot/countries/united-states/hs-codes/2931909025) Tetrabutyltin - [2931.90.90.29](https://border.bot/countries/united-states/hs-codes/2931909029) Other - [2931.90.90.30](https://border.bot/countries/united-states/hs-codes/2931909030) 2-Chlorovinyldichloroarsine - [2931.90.90.35](https://border.bot/countries/united-states/hs-codes/2931909035) Bis(2-chlorovinyl)chloroarsine - [2931.90.90.40](https://border.bot/countries/united-states/hs-codes/2931909040) Tris(2-chlorovinyl)arsine - [2931.90.90.52](https://border.bot/countries/united-states/hs-codes/2931909052) Other - Previous line: [2931.90.70.00](https://border.bot/countries/united-states/hs-codes/2931907000) N,N'-Bis(trimethylsilyl) urea; 3-(Hydroxymethylphosphinyl)-1-propanoic acid, 2-hydroxyethyl ester; and 2-Phosphonobutane-1,2,4-tricarboxylic acid and its salts - Next line: [2931.90.90.21](https://border.bot/countries/united-states/hs-codes/2931909021) Dibutyltin oxide ## Frequently asked questions ### What does tariff line 2931.90.90.10 cover in the United States tariff? In the United States tariff, line 2931.90.90.10 covers organo-silicon compounds. ### What is the general (MFN) duty on 2931.90.90.10 in the United States? The general (MFN) duty rate is 3.7%. The rate is published on 2931.90.90. ### Which preferential rates apply to 2931.90.90.10? Duty-free entry applies to goods that qualify under 16 programmes: the United States-Australia Free Trade Agreement, the United States-Bahrain Free Trade Agreement Implementation Act, the United States-Chile Free Trade Agreement, the United States-Colombia Trade Promotion Agreement Implementation Act, African Growth and Opportunity Act, Caribbean Basin Economic Recovery Act, the United States-Israel Free Trade Area, the United States-Jordan Free Trade Area Implementation Act, the United States-Korea Free Trade Agreement Implementation Act, the United States-Morocco Free Trade Agreement Implementation Act, the United States-Oman Free Trade Agreement Implementation Act, the Dominican Republic-Central America-United States Free Trade Agreement, the United States-Panama Trade Promotion Agreement Implementation Act, the United States-Peru Trade Promotion Agreement Implementation Act, the United States-Mexico-Canada Agreement and the United States-Singapore Free Trade Agreement, and to goods from a group of origins (origin group A*). ## Sources and updates The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026. The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026. The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026. This page was last updated on 9 October 2026. Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling. Official source files: - https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false Machine-readable: https://border.bot/countries/united-states/hs-codes/2931909010.json