Inorganic acids, not elsewhere specified

US trade by year

US imports were $55.3M in the 12 months to Aug 2026, up 28% on the 12 months to Aug 2017. US exports were $38.7M, down 2.0%. In January 2017 the HS 2017 revision moved some goods between this code and 2811.12, so part of a change across the dashed line can be the revision. Dotted lines mark lasting changes in duty paid, labelled with the supplier, or "Duty" when several moved; the tariff timeline lists each one with its notices.

• China
• Germany
• Malaysia
• Korea, South
• All countries

Who supplies the US

August 2026. Small figures under each value are the change from August 2025. Landed cost by origin, below, adds freight and duty to the price.

The 3 largest suppliers had 66.5% of US imports over the last 12 months.

Landed cost by origin

What importers paid to land this product at a US port from each main supplier, June–August 2026: the price, freight and insurance to the first US port, and duty, per unit. Suppliers with 3% or more of these imports, cheapest landed first. Small figures under landed cost are the change from the same months a year earlier.

• Price
• Freight and insurance
• Duty

Landed at a US port, Malaysia was cheapest, at $1.04/kg: 17.5% below Taiwan.

Landed cost from Korea, South rose 854% on a year earlier, to $69.19/kg, mostly on price: $6.48/kg then, $61.54/kg now.

How the market is shifting

Germany gained the most share: 20.9% of US imports over the last 12 months, up from 13.6% in the 12 months before. China lost the most: 32.2%, down from 35.5%. The charts show September 2024 to August 2026 for the 4 largest suppliers over the last 12 months. Dotted lines mark lasting changes in duty paid, labelled with the supplier, or "Duty" when several moved; the tariff timeline lists each one with its notices.

• China
• Germany
• Malaysia
• Korea, South
• All countries

Tariff actions touching this product

When the duty paid on this product changed and stayed changed, for its main suppliers and all countries, newest first, with the Federal Register notices that named the product in the 3 months before. Rates are medians of the 4 months either side, less any usual seasonal swing. A change shows what happened to duty paid, not why; read each notice for what it did.

1. December 2025–April 2026 · Duty paid: China 55.8% → 41.8%, Korea, South 15.0% → 10.0%, Taiwan 24.2% → 14.2%, all countries 26.1% → 18.3%.
   • 1-Hydroxyethylidene-1, 1-Diphosphonic Acid From the People's Republic of China: Final Affirmative Determination of CircumventionFeb 23, 2026 · International Trade Administration
   • Implementing Certain Tariff-Related Elements of the Framework for a United States-Switzerland-Liechtenstein Agreement on Fair, Balanced, and Reciprocal TradeDec 18, 2025 · International Trade Administration
   • Implementing Certain Tariff-Related Elements of the U.S.-EU Framework on an Agreement on Reciprocal, Fair, and Balanced TradeSep 25, 2025 · Office of the US Trade Representative
2. July–August 2025 · Duty paid: Korea, South 0.0% → 10.0%, Taiwan 12.3% → 23.5%, all countries 16.0% → 26.7%.
3. April 2025 · Duty paid: China 29.2% → 59.2%, Germany 4.2% → 14.2%.
4. July 2023 · Duty paid: all countries 17.6% → 10.8%.
5. October 2022 · Duty paid: all countries 22.4% → 16.9%.
   • 1-Hydroxyethylidene-1, 1-Diphosphonic Acid From the People's Republic of China: Final Results of the Expedited First Sunset Review of the Countervailing Duty OrderJul 18, 2022 · International Trade Administration
   • 1-Hydroxyethylidene-1, 1-Diphosphonic Acid From the People's Republic of China: Final Results of the Expedited First Sunset Review of the Antidumping Duty OrderJul 18, 2022 · International Trade Administration
6. December 2021 · Duty paid: all countries 17.8% → 24.9%.
7. July 2019 · Duty paid: China 13.9% → 28.6%, all countries 9.9% → 19.1%.
   • 1-Hydroxyethylidene-1, 1-Diphosphonic Acid From the People's Republic of China: Preliminary Results of Antidumping Duty Administrative Review; 2016-2018Jul 12, 2019 · International Trade Administration
   • Request for Comments Concerning Proposed Modification of Action Pursuant to Section 301: China's Acts, Policies, and Practices Related to Technology Transfer, Intellectual Property, and InnovationMay 17, 2019 · Office of the US Trade Representative
8. September–October 2018 · Duty paid: China 4.2% → 13.6%, all countries 3.4% → 8.5%.
   • Request for Comments Concerning Proposed Modification of Action Pursuant to Section 301: China's Acts, Policies, and Practices Related to Technology Transfer, Intellectual Property, and InnovationJul 17, 2018 · Office of the US Trade Representative

Federal Register notices from the last 12 months that list this product's tariff codes. A notice can add a duty, exclude products from one or only mention them, so read each for what it changes. Search the Federal Register for 2811.19

• Notice of Action: Brazil's Acts, Policies, and Practices Related to Digital Trade and Electronic Payment Services; Unfair, Preferential Tariffs; Anti-Corruption Enforcement; Intellectual Property Protection; Ethanol Market Access; and Illegal DeforestationJul 20, 2026 · Office of the US Trade Representative
• Notice of Determination and Request for Comments Concerning Action Pursuant to Section 301: Brazil's Acts, Policies, and Practices Related to Digital Trade and Electronic Payment Services; Unfair, Preferential Tariffs; Anti-Corruption Enforcement; Intellectual Property Protection; Ethanol Market Access; and Illegal DeforestationJun 4, 2026 · Office of the US Trade Representative
• 1-Hydroxyethylidene-1, 1-Diphosphonic Acid From the People's Republic of China: Final Affirmative Determination of CircumventionFeb 23, 2026 · International Trade Administration
• Implementing Certain Tariff-Related Elements of the Framework for a United States-Switzerland-Liechtenstein Agreement on Fair, Balanced, and Reciprocal TradeDec 18, 2025 · International Trade Administration

Markets abroad

Each country's own import figures for this product, from UN Comtrade: the 8 biggest importers outside the US in the latest year each has reported, what they bought from the US, and the change from the year before. Values usually include freight and insurance to the importer's border, so they run a little above US export figures. Countries report a year or more late; 117 have reported 2025 so far. Where a country's figure for imports from the US is under half or over double what the US recorded exporting there that year, the US figure is shown under it.

The biggest market outside the US is China, which imported $149.2M of this product in 2025, 2.5% of that from the US.

Of these, imports into Israel grew fastest: up 65% from 2024 to 2025.

Related products

Other products under heading 2811: inorganic acids not elsewhere specified and inorganic oxygen compounds of nonmetals not elsewhere specified. US trade over the 12 months to August 2026.