HS 283190 Other
Quick Answer: HS code 283190, titled "Other," encompasses a diverse range of inorganic peroxides and persalts not specifically classified elsewhere within Heading 2831. This includes various perborates, percarbonates, persulfates, and other compounds characterized by a peroxide group or a peroxoacid anion. Duty rates for this classification vary significantly by jurisdiction. The UK Trade Tariff applies a 0.00% ad valorem duty. The EU TARIC system generally imposes a 5.50% ad valorem duty. In the United States, the Most Favored Nation (MFN) duty rate can be as high as 35% ad valorem, though many products within this code benefit from preferential duty rates of 5.5% or even Free under various trade agreements (e.g., A, AU, BH, CL, CO, D, E, IL, JO, KR, MA, OM, P, PA, PE, S, SG). Importers should verify the specific product and origin to determine the applicable preferential rate.
What Are the Import Duty Rates?
🇬🇧 United Kingdom
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2831900000 | 0.00 % | — | — |
🇪🇺 European Union (TARIC)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2831900000 | 5.50 % | — | — |
🇺🇸 United States (HTSUS)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2831900000 | 5.5% | Free (17 programs) | ["kg"] |
Special rates available under trade agreements including USMCA, KORUS, GSP.
Duty rates sourced from the USITC (US International Trade Commission) Harmonized Tariff Schedule (HTS) (accessed 2/22/2026), EU TARIC – DG TAXUD (Directorate-General for Taxation and Customs Union) (accessed 2/22/2026), and UK Trade Tariff – HMRC (His Majesty's Revenue and Customs) (accessed 2/22/2026).
Data compiled and presented by HSRates.
Which Trade Agreements Reduce Duties for HS 2831.90?
Imports of Other may qualify for reduced or zero duty rates under free trade agreements and preferential programs. The overview below shows available preferential arrangements by jurisdiction, compiled by HSRates from official tariff and trade agreement data.
United States (HTSUS)
Free for USMCA, KORUS, GSP, and 14 other programs
European Union (TARIC)
Preferential rate data not yet available.
United Kingdom
Preferential rate data not yet available.
Preferential rates require proof of origin and may be subject to quotas or conditions. Always verify eligibility with a licensed customs broker.
Data compiled by HSRates.
Which Preferential Rates Apply to Your Origin Country?
Select an origin country to see if preferential rates apply.
Preferential rates based on available trade agreements. Actual rates may vary.
How Has Trade Volume Developed?
How to Classify This HS Code?
What products does HS 283190 cover?
This subheading covers "Other" dithionites and sulfoxylates, which are inorganic chemical compounds not specifically provided for in subheading 2831.10. It acts as a residual category for various chemical salts of dithionous acid (H2S2O4) and sulfoxylic acid (H2SO2) that do not contain sodium. According to the Harmonized System Nomenclature (WCO) and further detailed in the USITC Harmonized Tariff Schedule (HTSUS) and EU TARIC, this includes compounds like zinc dithionite (ZnS2O4) and other metallic dithionites or sulfoxylates, provided they are chemically defined and not mixtures or preparations falling under other chapters.
What falls outside HS 283190?
The following products are excluded from HS 283190: sodium dithionite and sodium sulfoxylates, which are specifically classified under subheading 2831.10. Additionally, preparations containing dithionites or sulfoxylates, such as those used as bleaching agents or reducing agents, are generally excluded if they are not chemically defined pure compounds and instead constitute mixtures or formulations. For instance, textile auxiliaries or dyeing preparations containing these chemicals, but not being pure compounds, would typically fall under Chapter 38, specifically heading 3809, as preparations of a kind used in the textile, paper, leather or like industries.
What are common classification mistakes for HS 283190?
A common error is misclassifying sodium dithionite or sodium sulfoxylates under 283190 instead of their specific subheading 2831.10, which is a direct violation of General Interpretative Rule (GRI) 1, requiring classification according to the terms of the headings and any relative section or chapter notes. Another frequent mistake involves classifying mixtures or preparations containing dithionites or sulfoxylates as pure compounds under 283190, when they should properly be classified under Chapter 38 or other relevant chapters based on their composition and intended use, often due to overlooking GRI 3(b) for mixtures.
How should importers classify products under HS 283190?
The correct procedure for classifying products under HS 283190 involves first confirming that the product is a chemically defined dithionite or sulfoxylate. Importers and customs brokers must then verify that the product does not contain sodium, as sodium compounds are specifically assigned to subheading 2831.10. A detailed chemical analysis or Certificate of Analysis (CoA) from the manufacturer is crucial to confirm the exact chemical composition and purity. If the product is a mixture or preparation, its primary function and components should be evaluated against Chapter 38 or other relevant chapters, applying GRI 3(b) if necessary, to ensure accurate classification and avoid potential penalties.
Which HS Codes Are Related?
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FAQ
What are the typical import duty rates for products classified under HS 2831.90 in major markets, and are there any preferential tariffs available?
The Most Favored Nation (MFN) duty rates for HS 2831.90 ('Other' dithionites and sulfoxylates) can vary significantly by importing country. For instance, the United States generally applies an MFN duty rate of 3.7% ad valorem. The European Union's TARIC database indicates an MFN duty rate of 5.5% ad valorem for this subheading. The United Kingdom Global Tariff also lists a 5.5% ad valorem MFN rate. However, many preferential tariff programs offer reduced or duty-free treatment. For the US, products from countries with which the US has Free Trade Agreements (FTAs) such as Australia (AU), Bahrain (BH), Chile (CL), Colombia (CO), Israel (IL), Jordan (JO), Korea (KR), Morocco (MA), Oman (OM), Panama (PA), Peru (PE), and Singapore (SG) are often eligible for 'Free' (0.00%) duty rates, provided all rules of origin are met. Importers should consult the specific country's tariff schedule (e.g., USITC HTSUS, EU TARIC, UK Trade Tariff) for the most accurate and up-to-date rates applicable to their specific origin and destination.
What are the key classification criteria for determining if a chemical product falls under HS 2831.90, as opposed to other subheadings within Chapter 28?
HS 2831.90 is the 'Other' subheading for dithionites and sulfoxylates. The primary classification criterion is the chemical identity of the substance. HS 2831 specifically covers 'Dithionites and sulfoxylates.' Subheading 2831.10 is reserved for 'Sodium dithionite.' Therefore, any dithionite or sulfoxylate that is not sodium dithionite, and is not more specifically provided for elsewhere in the Harmonized System, would fall under 2831.90. Importers must ensure the chemical name, CAS number, and chemical structure confirm it is a dithionite or sulfoxylate, and then confirm it is not sodium dithionite. For example, zinc dithionite or formaldehyde sulfoxylate would typically classify here. A Certificate of Analysis (CoA) or Safety Data Sheet (SDS) from the manufacturer is crucial for accurate chemical identification.
What specific documentation is required by customs authorities when importing products classified under HS 2831.90?
For HS 2831.90, standard import documentation includes a commercial invoice, packing list, and bill of lading or air waybill. Crucially, due to the chemical nature of the goods, a Certificate of Analysis (CoA) and/or a Safety Data Sheet (SDS) are often required or highly recommended to verify the exact chemical composition and ensure accurate HS classification and compliance with any chemical import regulations. If claiming preferential duty rates under a Free Trade Agreement (FTA), a valid Certificate of Origin (or equivalent declaration) is mandatory to substantiate the claim. Depending on the specific chemical and the importing country, additional permits or licenses from environmental, health, or chemical control agencies may be necessary (e.g., TSCA compliance in the US, REACH in the EU/UK). Importers should verify specific requirements with the customs authority of the importing country prior to shipment.
Which major trade agreements frequently offer preferential duty treatment for goods under HS 2831.90, and what are the implications for importers?
Many major trade agreements provide preferential duty treatment for HS 2831.90. For importers into the United States, agreements such as the USMCA (formerly NAFTA), CAFTA-DR, and bilateral FTAs with countries like Australia, Chile, Colombia, Korea, Peru, and Singapore typically offer duty-free (0.00%) access for qualifying goods. Similarly, the EU's extensive network of FTAs (e.g., with Canada, Japan, Korea, UK) and preferential schemes (e.g., GSP) can reduce or eliminate the 5.5% MFN duty. The UK also has numerous FTAs that can provide preferential rates. The key implication for importers is the potential for significant cost savings on import duties. However, to benefit from these preferential rates, goods must strictly comply with the specific Rules of Origin outlined in each agreement. This often involves detailed record-keeping and providing a valid Certificate of Origin or origin declaration. Failure to meet these rules will result in the application of the higher MFN duty rate.