# United States tariff line 3810.90.10.00: Containing 5 percent or more by weight of one or more aromatic or modified aromatic substances > In the United States tariff, line 3810.90.10.00 covers pickling preparations for metal surfaces; fluxes and other auxiliary preparations for soldering, brazing or welding; soldering, brazing or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods, containing 5 percent or more by weight of one or more aromatic or modified aromatic substances. The general (MFN) duty rate is 6.5%. It falls under HS subheading 3810.90 in heading 38.10 (chapter 38). Source: https://border.bot/countries/united-states/hs-codes/3810901000 Last updated: 9 October 2026 [Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 38](https://border.bot/countries/united-states/hs-codes/38) / [3810.90](https://border.bot/countries/united-states/hs-codes/381090) / [3810.90.10.00](https://border.bot/countries/united-states/hs-codes/3810901000) ## Key facts - Tariff line: 3810.90.10.00 - Covers: Pickling preparations for metal surfaces; fluxes and other auxiliary preparations for soldering, brazing or welding; soldering, brazing or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods, containing 5 percent or more by weight of one or more aromatic or modified aromatic substances - Duty (MFN): 6.5% - 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: [3810.90](https://border.bot/hs-codes/381090) ## What this line covers In the United States tariff, line 3810.90.10.00 covers pickling preparations for metal surfaces; fluxes and other auxiliary preparations for soldering, brazing or welding; soldering, brazing or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods, containing 5 percent or more by weight of one or more aromatic or modified aromatic substances. Its legal text is “Containing 5 percent or more by weight of one or more aromatic or modified aromatic substances”, read under “Other”. ## How it is structured It falls under HS subheading 3810.90 in heading 38.10 (chapter 38). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff. - Chapter 38: Miscellaneous chemical products - Heading 38.10: Pickling preparations for metal surfaces; fluxes and other auxiliary preparations for soldering, brazing or welding; soldering, brazing or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods - Subheading 3810.90: Other - Line 3810.90.10.00: Containing 5 percent or more by weight of one or more aromatic or modified aromatic substances ## Duty The general (MFN) duty rate is 6.5%. 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 3810.90 yet. - [The Harmonized System text for 3810.90](https://border.bot/hs-codes/381090) ## Other lines under 3810.90 - [3810.90.20.00](https://border.bot/countries/united-states/hs-codes/3810902000) Consisting wholly of inorganic substances - [3810.90.50.00](https://border.bot/countries/united-states/hs-codes/3810905000) Other - Previous line: [3810.10.00.00](https://border.bot/countries/united-states/hs-codes/3810100000) Pickling preparations for metal surfaces; soldering, brazing or welding powders and pastes consisting of metal and other materials - Next line: [3810.90.20.00](https://border.bot/countries/united-states/hs-codes/3810902000) Consisting wholly of inorganic substances ## Frequently asked questions ### What does tariff line 3810.90.10.00 cover in the United States tariff? In the United States tariff, line 3810.90.10.00 covers pickling preparations for metal surfaces; fluxes and other auxiliary preparations for soldering, brazing or welding; soldering, brazing or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods, containing 5 percent or more by weight of one or more aromatic or modified aromatic substances. ### What is the general (MFN) duty on 3810.90.10.00 in the United States? The general (MFN) duty rate is 6.5%. ### Which preferential rates apply to 3810.90.10.00? 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/3810901000.json