# United States tariff line 2908.99.09.00: 1,8-Dihydroxynaphthalene-3,6-disulfonic acid and its disodium salt > In the United States tariff, line 2908.99.09.00 covers derivatives containing only sulfo groups, their salts and esters, 1,8-Dihydroxynaphthalene-3,6-disulfonic acid and its disodium salt. The general (MFN) duty rate is 5.5%. It falls under HS subheading 2908.99 in heading 29.08 (chapter 29). Source: https://border.bot/countries/united-states/hs-codes/2908990900 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) / [2908.99](https://border.bot/countries/united-states/hs-codes/290899) / [2908.99.09.00](https://border.bot/countries/united-states/hs-codes/2908990900) ## Key facts - Tariff line: 2908.99.09.00 - Covers: Derivatives containing only sulfo groups, their salts and esters, 1,8-Dihydroxynaphthalene-3,6-disulfonic acid and its disodium salt - Duty (MFN): 5.5% - 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: [2908.99](https://border.bot/hs-codes/290899) ## What this line covers In the United States tariff, line 2908.99.09.00 covers derivatives containing only sulfo groups, their salts and esters, 1,8-Dihydroxynaphthalene-3,6-disulfonic acid and its disodium salt. Its legal text is “1,8-Dihydroxynaphthalene-3,6-disulfonic acid and its disodium salt”, read under “Other”, “Other” and “Derivatives containing only sulfo groups, their salts and esters”. ## How it is structured It falls under HS subheading 2908.99 in heading 29.08 (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 29.08: Halogenated, sulfonated, nitrated or nitrosated derivatives of phenols or phenol-alcohols - Subheading 2908.99: Other - Within the subheading: Other - Within the subheading: Derivatives containing only sulfo groups, their salts and esters - Line 2908.99.09.00: 1,8-Dihydroxynaphthalene-3,6-disulfonic acid and its disodium salt ## Duty The general (MFN) duty rate is 5.5%. 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 2908.99 yet. - [The Harmonized System text for 2908.99](https://border.bot/hs-codes/290899) ## Other lines under 2908.99 - [2908.99.03.00](https://border.bot/countries/united-states/hs-codes/2908990300) 2,5-Dihydroxybenzenesulfonic acid, potassium salt; 3,6-Dihydroxy-2,7-naphthalenedisulfonic acid; 3,6-Dihydroxy-2,7-naphthalenedisulfonic acid, sodium salt; 4-Hydroxy-1-naphthalenesulfonic acid, sodium salt; 1-Naphthol-3,6-disulfonic acid; and 2-Naphthol-3,6-disulfonic acid and its salts - [2908.99.06.00](https://border.bot/countries/united-states/hs-codes/2908990600) 4-Hydroxy-1-naphthalenesulfonic acid (1-Naphthol-4-sulfonic acid) - [2908.99.12.00](https://border.bot/countries/united-states/hs-codes/2908991200) Products described in additional U.S. note 3 to section VI - [2908.99.15.00](https://border.bot/countries/united-states/hs-codes/2908991500) Other - [2908.99.20.00](https://border.bot/countries/united-states/hs-codes/2908992000) p-Nitrophenol - [2908.99.25.00](https://border.bot/countries/united-states/hs-codes/2908992500) Other nitrophenols - [2908.99.33.00](https://border.bot/countries/united-states/hs-codes/2908993300) Dinitro-o-cresols (other than 4,6-dinitro-o-cresol) and 4-nitro-m-cresol - [2908.99.40.00](https://border.bot/countries/united-states/hs-codes/2908994000) Dinitrobutylphenol and its salts - [2908.99.80.00](https://border.bot/countries/united-states/hs-codes/2908998000) Products described in additional U.S. note 3 to section VI - [2908.99.90.00](https://border.bot/countries/united-states/hs-codes/2908999000) Other - Previous line: [2908.99.06.00](https://border.bot/countries/united-states/hs-codes/2908990600) 4-Hydroxy-1-naphthalenesulfonic acid (1-Naphthol-4-sulfonic acid) - Next line: [2908.99.12.00](https://border.bot/countries/united-states/hs-codes/2908991200) Products described in additional U.S. note 3 to section VI ## Frequently asked questions ### What does tariff line 2908.99.09.00 cover in the United States tariff? In the United States tariff, line 2908.99.09.00 covers derivatives containing only sulfo groups, their salts and esters, 1,8-Dihydroxynaphthalene-3,6-disulfonic acid and its disodium salt. ### What is the general (MFN) duty on 2908.99.09.00 in the United States? The general (MFN) duty rate is 5.5%. ### Which preferential rates apply to 2908.99.09.00? 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/2908990900.json