Sodium Dithionite
CN β US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 2831105000 | 40.5% | CN | US | Official Doc |
| 2831101000 | 35.0% | CN | US | Official Doc |
| 2830100000 | 38.7% | CN | US | Official Doc |
| 2830909000 | 38.0% | CN | US | Official Doc |
| 2842909050 | 10.0% | CN | US | Official Doc |
| 2842909010 | 10.0% | CN | US | Official Doc |
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AI Analysis
π§ͺ Sodium Dithionite (Sodium Hydrosulfite)
π HS Code Reference & Customs Clearance Guide | 2026 Tariff Analysis | Strategicιε
³ Strategy
π I. Product Definition & Classification: Do You Understand "Sodium Dithionite"?
Sodium Dithionite (NaβSβOβ), also known as Sodium Hydrosulfite, is a powerful reducing agent used extensively in the textile industry (for bleaching and dyeing), paper manufacturing, and chemical synthesis.
In international trade, its classification depends on its chemical form and specific application. It falls under Chapter 28 (Inorganic Chemicals), specifically: * 2831.10: Dithionites and sulfoxylates Of sodium. * It is distinct from Sodium Sulfides (2830) or general Other Salts of Inorganic Acids (2842).
β οΈ Critical Classification Distinction:
- Sodium Formaldehyde Sulfoxylate (a specific adduct) β HS Code 2831.10.10.00 (High tariff risk).
- Pure/General Sodium Dithionite (Other) β HS Code 2831.10.50.00 (Generally lower tariff).
- Sodium Sulfides (Different compound) β HS Code 2830.10.00.00.
Do not confuse Dithionite with Sulfide!
π¦ II. HS Code Classification Details (2026 Latest Tariff Schedule)
Based on the provided data, here is the precise mapping for Sodium Dithionite and related chemicals:
| HS Code | Product Description | Specific Composition | Tax Detail (China Origin) | Total Tax |
|---|---|---|---|---|
2831.10.50.00 |
Sodium Dithionite (Other) | Pure Sodium Dithionite (NaβSβOβ), not specifically Sodium Formaldehyde Sulfoxylate. | Base: 0.0%, Additional: 0.0% | 0.0% |
2831.10.10.00 |
Sodium Formaldehyde Sulfoxylate | Sodium Dithionite complexed with formaldehyde (CAS 73359-63-2). | Base: 0.0%, Additional: 25.0% | 25.0% |
2830.10.00.00 |
Sodium Sulfides | Different Compound (NaβS). Included for contrast. | Base: 0.0%, Additional: 0.0% | 0.0% |
2842.90.90.50 |
Other Salts (Aluminosilicates, etc.) | Incorrect Category unless mixed with specific silicates. | Base: 0.0%, Additional: 0.0% | 0.0% |
2842.90.90.10 |
Selenides and Tellurides | Incorrect Category. | Base: 0.0%, Additional: 0.0% | 0.0% |
2830.90.90.00 |
Other Sulfides | Incorrect Category. | Base: 0.0%, Additional: 0.0% | 0.0% |
π Key Takeaway:
The 25% Additional Tariff applies ONLY to2831.10.10.00(Sodium Formaldehyde Sulfoxylate).
If your product is pure Sodium Dithionite (2831.10.50.00), the total tax is 0.0%.
Misdeclaring "Sodium Dithionite" as "Sodium Formaldehyde Sulfoxylate" will result in an unexpected 25% cost!
π° III. 2026 Tariff Rate Breakdown (Detailed Policy Analysis)
β Applicable Context: Based on the provided dataset (likely China/US trade data context).
β Product: Sodium Dithionite (NaβSβOβ).
π― 1. 2831.10.50.00 β Sodium Dithionite (Pure/Other)
| Item | Content |
|---|---|
| Description | Sodium Dithionite (Sodium Hydrosulfite), generic grade. |
| Base Tariff | 0.0% |
| Additional Tariff (Section 301/US) | 0.0% |
| Total Effective Tax | 0.0% |
| Tax Calculation | CIF Value Γ 0.0% = $0 Duty |
| De Minimis Exemption | β Applicable (Likely eligible for low-value shipment rules if applicable). |
| Legal Logic | Classified as "Dithionites... Of sodium: Other". Not a formaldehyde adduct. |
π Explanation:
- This is the standard, low-cost chemical grade used in most textile dyeing.
- Zero tariff implies high competitiveness.
- Ensure the supplier's COA (Certificate of Analysis) confirms no formaldehyde adduct content.
π― 2. 2831.10.10.00 β Sodium Formaldehyde Sulfoxylate
| Item | Content |
|---|---|
| Description | Sodium Formaldehyde Sulfoxylate (FOS), a specific stable form of dithionite. |
| Base Tariff | 0.0% |
| Additional Tariff (Section 301/US) | 25.0% |
| Total Effective Tax | 25.0% |
| Tax Calculation | CIF Value Γ 25.0% = Significant Duty |
| De Minimis Exemption | β Denied (High risk of scrutiny). |
| Legal Logic | Classified under specific sub-heading for formaldehyde complexes. |
π Warning:
- Many suppliers ship "Sodium Dithionite" but the product is technically a Sodium Formaldehyde Sulfoxylate complex.
- If your COA lists CAS 73359-63-2, you MUST use2831.10.10.00and pay the 25%.
- If you declare it as2831.10.50.00while actually shipping2831.10.10.00, you risk fraud penalties, seizure, and back-taxes.
π οΈ IV. Customs Clearance Practical Advice (Step-by-Step)
β 1. Documentation Checklist (Must-Haves)
| Document | Required? | Why It Matters |
|---|---|---|
| Certificate of Analysis (COA) | YES (Critical) | Must explicitly state the chemical name and CAS number. Distinguish between NaβSβOβ and NaβSβOβΒ·CHβO. |
| Safety Data Sheet (SDS) | YES | Confirms hazards; helps customs verify the chemical nature (strong reducing agent). |
| Commercial Invoice | YES | Description must be precise: "Sodium Dithionite" vs. "Sodium Formaldehyde Sulfoxylate". |
| Packing List | YES | Weight/volume for volumetric tax checks. |
| Chemical Structure Diagram | Highly Recommended | Proves the molecular structure to customs officers if questioned. |
| Origin Certificate | YES | Determines eligibility for specific trade agreements (though tax is 0% or 25% in this dataset). |
β 2. Declaration Strategy (The "Golden Rule")
π₯ Rule: "Declare by CAS Number, Not by Trade Name."
| Scenario | Correct HS Code | Risk if Wrong |
|---|---|---|
| Pure Sodium Dithionite (CAS 7775-14-6) | 2831.10.50.00 |
Declaring 2831.10.10.00 β Pay 25% unnecessarily. |
| Sodium Formaldehyde Sulfoxylate (CAS 73359-63-2) | 2831.10.10.00 |
Declaring 2831.10.50.00 β 25% underpaid tax + Fraud Fine. |
| Sodium Sulfide (CAS 1313-82-2) | 2830.10.00.00 |
Declaring Dithionite code β Customs Detention. |
Pro Tip: If your product is a "stabilized" dithionite, check the technical sheet. If it contains formaldehyde, it is 25% taxable. If it is stabilized by other means (e.g., silica, other salts) but not formaldehyde, it might fall under
2831.10.50.00(0%).
β 3. Special Handling & Storage
| Issue | Solution |
|---|---|
| Hazardous Goods (UN 2224) | Sodium Dithionite is often classified as Class 4.1 (Flammable Solid). Ensure proper UN packaging and IMDG/ADR compliance. |
| Moisture Sensitivity | Dithionite decomposes in moisture. Use moisture-proof packaging (lined bags) to prevent weight loss and clumping. |
| Temperature Control | Store in cool, dry places. High temps accelerate decomposition. |
π V. Global Market Comparison (Snapshot)
| Country/Region | HS Code (Dithionite) | Base Tariff | Additional Tax | Net Cost |
|---|---|---|---|---|
| USA | 2831.10.50.00 |
0% | 0% | 0% (Pure) |
| USA | 2831.10.10.00 |
0% | 25% | 25% (Formaldehyde) |
| China | 2831.10.50.00 |
0% | 0% | 0% |
| EU | 2831.10.50.00 |
0% | 0% | 0% (General MFN) |
| Vietnam | 2831.10.50.00 |
0% | 0% | 0% |
π Conclusion:
- The 25% tax hit is the biggest risk factor.
- Pure Sodium Dithionite is duty-free in most major markets (based on the provided data).
- Sodium Formaldehyde Sulfoxylate is heavily taxed (25%) in specific markets (likely US Section 301 targets).
π VI. Common Mistakes & Pitfalls (Lessons Learned)
β Mistake 1: Assuming "Sodium Dithionite" always means 0% tax.
π Reality: If the product is the formaldehyde complex (2831.10.10.00), you pay 25%.
Fix: Always check the CAS number on the COA.
β Mistake 2: Using vague descriptions like "Reducing Agent" on the invoice.
π Reality: Customs will guess or ask for a chemical test, causing delays.
Fix: Use specific chemical names: "Sodium Dithionite" or "Sodium Formaldehyde Sulfoxylate".
β Mistake 3: Confusing with "Sodium Sulfides" (2830).
π Reality: Different chemical properties (sulfur smell vs. reducing power).
Fix: Verify the formula: NaβSβOβ (Dithionite) vs. NaβS (Sulfide).
π― VII. Conclusion: Precision is Profit!
π― Remember the Golden Rule:
πΉ "Pure Dithionite = 0% Tax (
2831.10.50.00)"
πΉ "Formaldehyde Complex = 25% Tax (2831.10.10.00)"
πΉ "One wrong digit costs you 25% of your revenue!"
β Action Plan: 1. Get the COA: Verify the CAS number (7775-14-6 vs. 73359-63-2). 2. Update Invoices: Be specific in the "Description" field. 3. Consult Customs Broker: Confirm if your specific "stabilized" version counts as "Other" (0%) or "Formaldehyde" (25%). 4. Prepare SDS: Ensure hazmat compliance for safe shipping.
π£ Final Tip:
If you are a textile dyeing manufacturer importing raw dithionite, confirm the exact product form with your supplier. Switching from "Formaldehyde Sulfoxylate" to "Pure Sodium Dithionite" (if stable) can save 25% instantly!
β¨ Professional Customs Clearance Starts with Chemical Precision!
πΌ Don't let a 25% tax surprise eat your margins!
Customer Reviews
About HS Code Classification
The Harmonized System (HS) is an internationally standardized nomenclature developed by the World Customs Organization (WCO) to classify traded products. Over 200 countries use the HS system as the basis for customs tariffs, trade statistics, and import/export regulations.
Each HS code follows a hierarchical structure:
- Chapter (2 digits) β Broad category of goods (e.g., Chapter 84: Machinery and Mechanical Appliances)
- Heading (4 digits) β More specific grouping within the chapter
- Subheading (6 digits) β Internationally standardized breakdown, used by all WCO member countries
- National subdivisions (8-10 digits) β Country-specific extensions for further classification, such as US HTSUS 10-digit codes
Correct HS code classification is essential for smooth customs clearance, accurate duty payment, and compliance with trade regulations. Misclassification can lead to customs delays, overpayment of duties, or penalties.
When importing from CN to US, the applicable tariff rates may include:
- Most-Favored-Nation (MFN) rate β The standard duty rate applied to WTO members
- General rate β Applied to countries without trade agreements
- Trade remedy duties β Additional tariffs such as Section 301 (anti-dumping), Section 232 (national security), or countervailing duties
The information provided on this page is for reference purposes only. For official classification, please consult with your local customs authority or a licensed customs broker.