Industrial Grade Sodium Bisulfite

⚗️ Industrial Grade Sodium Bisulfite (Sodium Dithionite)

🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Clearance Strategy
📌 I. Product Definition & Classification: Do You Really Understand "Sodium Bisulfite"?

In international trade, the term "Sodium Bisulfite" is often used loosely. However, strictly speaking, Sodium Bisulfite (NaHSO₃) and Sodium Dithionite (Na₂S₂O₄) are chemically distinct. Yet, in many industrial contexts, especially where "Bisulfite" is used as a reducing agent or bleaching agent, the term is frequently confused with or overlaps into Sodium Dithionite classifications, particularly when the product is a technical grade reducing agent.

According to the provided , we are dealing with Sodium Dithionites and Sulfoxylates. This classification is critical because misidentifying a Dithionite product as a simple Bisulfite (which might fall under different chemical categories like 2835 or 2836) can lead to severe compliance errors, although the tax rate here is favorable.

⚠️ Key Distinction Point:
- If the product is Sodium Dithionite (Na₂S₂O₄), also known formally as Sodium Hydrosulfite, it falls under HS 2831.10 or 2831.90.
- The explicitly lists descriptions matching Dithionites and Sulfoxylates, confirming that this entry covers Sodium Dithionite products, which are powerful reducing agents used in pulp bleaching, dyeing, and organic synthesis.

📦 II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)

Based strictly on the provided , here are the applicable HS Codes for Sodium Dithionites/Sulfoxylates:

🔍 Important Note:
- The provides two codes. 2831.10.50.00 is the primary target if the product is Sodium Dithionite (since "Industrial Grade Sodium Bisulfite" is often a misnomer for Sodium Dithionite in reducing agent contexts, or the user is asking about Dithionites per the data).
- If the product is strictly Calcium Dithionite or Zinc Dithionite, it would fall under 2831.90.00.00.
- Assumption: Given the prompt "Industrial Grade Sodium Bisulfite" and the data on "Sodium Dithionites," we assume the product is Sodium Dithionite (Na₂S₂O₄), which is commonly confused with Bisulfite. If it is truly Sodium Bisulfite (NaHSO₃), it would typically fall under 2836.20.00.00 or 2836.99, which is NOT in the provided . Therefore, the guide below strictly follows the provided for Dithionites/Sulfoxylates.

💰 III. 2026 Latest Tariff Rate Details (Including Additional Taxes)

✅ Applicable Country: United States (US)
✅ Origin: China (CN) (Assumed based on common trade flows for chemical goods; if origin is different, verify IEEPA applicability)
✅ Effective Time: 2026 Current Tariff Structure

🎯 1. 2831.10.50.00 —— Dithionites and Sulfoxylates: Of Sodium: Other

📌 Explanation:
- Base Tariff: Under HTS 2831 (Sulphides; Polysulphides), sodium dithionites generally carry a 0% base duty.
- Additional Taxes: Unlike high-tech goods or certain consumer electronics, chemical intermediates like sodium dithionite are not currently subject to Section 301 (25%) or IEEPA (10%) additional tariffs in the provided .
- Total Cost Impact: Zero tariffs. This makes it a highly cost-effective import category for chemical manufacturers.

🎯 2. 2831.90.00.00 —— Dithionites and Sulfoxylates: Other

📌 Note:
- Even for non-sodium dithionites (e.g., calcium dithionite), the tax burden is 0% according to the provided data.
- Caution: Ensure the chemical composition is accurately declared. If it is a mixture or solution, it may fall under different chapters (e.g., 3808 or 2835), which could have different tax implications.

🛠️ IV. Customs Clearance Practical Advice (Combat Pitfall Guide)

✅ 1. Required Documents Checklist (Non-Negotiable)

✅ 2. Declaration Techniques (Key Mnemonics)

🔥 “Name Precisely, Check CAS, DG Rules Apply!”

📌 Critical Warning:
- "Sodium Bisulfite" (NaHSO₃) is NOT Sodium Dithionite (Na₂S₂O₄).
- If your product is truly Sodium Bisulfite, it should NOT be declared under HS 2831.10.50.00. It should be under 2836.20.00.00 (Sodium bisulphite).
- However, since the provided only contains Dithionites, this guide assumes the user is importing Sodium Dithionite (often called "Sodium Hydrosulfite" or mistakenly "Bisulfite" in some supply chains).
- If it is truly Bisulfite, please verify with a customs broker, as the tax rate may differ, and it is not covered by the provided.

✅ 3. Special Handling for Dangerous Goods

🌍 V. Global Market Comparison (2026 Latest)

📌 Conclusion:
- US Tariff: 0% for Sodium Dithionite (HS 2831.10.50.00).
- Key Risk: Not tariff-related, but Regulatory (TSCA in US, REACH in EU) and Safety (DG handling).

📌 VI. Common Mistakes & Pitfalls (Lessons Learned)

❌ Mistake 1: Confusing Sodium Bisulfite (NaHSO₃) with Sodium Dithionite (Na₂S₂O₄)
👉 Consequence: If you declare Bisulfite under 2831.10.50.00, Customs may reject it because Bisulfite belongs to HS 2836. Even if tax rates are similar, misdeclaration leads to fines.
👉 Solution: Check the CAS Number:
- Sodium Dithionite: CAS 7775-14-6 → HS 2831.10.50.00
- Sodium Bisulfite: CAS 7631-90-5 → HS 2836.20.00.00 (Not in )

❌ Mistake 2: Ignoring Dangerous Goods (DG) Classification
👉 Consequence: Sodium Dithionite is often Dangerous Goods. If not declared as DG, it may be seized at origin or destination.
👉 Solution: Always provide UN Number and DG Declaration.

❌ Mistake 3: Assuming "Industrial Grade" Means No Certifications
👉 Consequence: US Customs requires TSCA (Toxic Substances Control Act) compliance for chemical imports.
👉 Solution: Ensure the supplier provides a TSCA certification letter.

🎯 VII. Conclusion: Precise Classification Saves Time & Money

🎯 Remember the Mnemonic:

🔹 "Dithionite is 2831, Bisulfite is 2836. Check CAS! Check CAS!"
🔹 "Zero Tax for Dithionite, But DG Rules Apply."
🔹 "If it's NaHSO₃, don't use 2831.10.50.00!"

📌 Pro Tip:
If your product is Sodium Bisulfite (NaHSO₃), do not use the HS Codes in . Instead, use 2836.20.00.00 and check for 0% tariff there.
If your product is Sodium Dithionite (Na₂S₂O₄), you are in luck: 0% Tariff under 2831.10.50.00 with No Additional Taxes.

📣 Immediate Action:

📞 Verify CAS Number:
- CAS 7775-14-6 → Sodium Dithionite → Use 2831.10.50.00 → 0% Tax
- CAS 7631-90-5 → Sodium Bisulfite → Use 2836.20.00.00 → Not in
🚀 Ensure DG Compliance for Sodium Dithionite shipments.
✨ Professional clearance starts with accurate chemical identification!

✨ Zero Tariff Opportunity for Sodium Dithionite!
💼 Don't misdeclare Bisulfite as Dithionite – Verify CAS!