Sodium Sulfate (Anhydrous)

🧪 Sodium Sulfate (Anhydrous) – Comprehensive HS Code & Tariff Guide (2026 Update)

🌐 HS Code Classification & Customs Clearance Strategy | 2026 Tariff Breakdown | Expert-Level Compliance Guide
📌 One-Stop Reference for Importers, Exporters & Logistics Professionals

📦 1. Product Definition & Classification: What Is Anhydrous Sodium Sulfate?

Anhydrous Sodium Sulfate (Chemical formula: Na₂SO₄) is a white, crystalline, water-free salt used in: - Glass manufacturing (as a flux) - Detergent production (filler & bulking agent) - Textile processing (sizing agent) - Chemical synthesis (intermediate in sulfate processes) - Pharmaceutical and laboratory applications

⚠️ Key Distinction: - Anhydrous = No water of crystallization (pure, dry form) → Higher value, higher tax risk - Hydrated (e.g., Glauber’s salt, Na₂SO₄·10H₂O) → Different HS code, different tariff

✅ This entry applies ONLY to anhydrous forms — not hydrates, not mixtures, not technical grades with impurities.

📌 2. HS Code Classification Table (2026 Official Tariff Schedule)

🔍 Critical Note:
- Only 2833.11.50.10 applies to anhydrous sodium sulfate
- 2833.11.50.50 covers all other non-anhydrous forms — even if labeled "anhydrous" on invoice, if water content >0.1%, it may be misclassified

💰 3. 2026 Tariff Breakdown: Full Tax Detail (U.S. Import Context)

✅ Applicable Country: United States (US)
✅ Origin: China (CN), India (IN), Germany (DE), etc.
✅ Effective Date: January 1, 2026 (updated tariff schedule)

🎯 1. 2833.11.50.10 – Anhydrous Disodium Sulfate

📌 Explanation:
- This product is not subject to any additional tariffs under Section 301 (USITC), IEEPA, or other trade acts. - Even if imported from China, no 25% or 10% extra duty applies. - Zero-duty status confirmed by U.S. Customs and Border Protection (CBP) for anhydrous form.

🎯 2. 2833.11.50.50 – Other Disodium Sulfate (Non-Anhydrous)

📌 Important Clarification:
- Even hydrated or technical-grade sodium sulfate (e.g., 95% purity, with moisture) falls under this code. - Still 0% duty, as long as it’s not a fertilizer, not a mixture, and not under special anti-dumping measures.

❗ Exception: If the product is a fertilizer blend (e.g., Na₂SO₄ + NPK), it would fall under 3105.90.00.50 → 25% tariff.
→ Only pure chemical sodium sulfate qualifies for 0% duty.

🛠️ 4. Customs Clearance Best Practices (Pro Tips to Avoid Delays)

✅ 1. Required Documentation (Must-Have)

✅ 2.申报技巧（申报口诀）

🔥 “Anhydrous = 0% duty, Hydrated = 0% duty, But Mix = 25%!”

📌 Pro Tip:
- Label the product as “Anhydrous” only if moisture <0.1%
- Use Karl Fischer testing to verify anhydrous status — this is the gold standard.

✅ 3. Special Cases & Handling

🌍 5. Global Market Comparison (2026 Tariff Snapshot)

📌 Key Insight:
- All major markets treat pure anhydrous sodium sulfate as 0% duty
- Only the U.S. has a complex footnote system — but no extra duty applies here

📌 6. Common Mistakes & How to Avoid Them (Real-World Examples)

❌ Mistake 1: Claiming “anhydrous” on invoice but CoA shows 0.3% moisture
👉 Result: CBP may reclassify as 2833.11.50.50 → risk of audit, penalty, or seizure

❌ Mistake 2: Shipping sodium sulfate in fertilizer blend (e.g., for agriculture)
👉 Result: Misclassified as 3105.90.00.50 → 25% tariff + interest + penalties

❌ Mistake 3: Not providing CoA or SDS
👉 Result: Delayed release, CBP request for additional info, potential detention

❌ Mistake 4: Using “sodium sulfate” without specifying anhydrous/hydrated
👉 Result: CBP may default to higher-risk classification → increased scrutiny

✅ Correct Approach:

“Anhydrous Sodium Sulfate (Na₂SO₄), 99.5% purity, moisture <0.1%, Karl Fischer tested, for industrial use, not for fertilizers”

🎯 7. Final Summary: The 3 Golden Rules for Sodium Sulfate Imports

1. 🔹 Anhydrous = 2833.11.50.10 → 0% duty
2. 🔹 Hydrated or impure = 2833.11.50.50 → 0% duty
3. 🔹 Any fertilizer blend or mixture = 3105.90.00.50 → 25% tariff!

✅ Bottom Line:
- Pure anhydrous sodium sulfate is duty-free in the U.S. and globally
- Only risk arises if mixed with fertilizers or falsely labeled

📣 Ready to Ship? Act Now!

📞 Contact a licensed customs broker + request HS Code pre-ruling for high-value shipments
🚀 Use CoA + Karl Fischer test to prove anhydrous status
💼 Avoid the 25% trap — don’t mix with fertilizers!

✨ Professional Compliance Starts Here!
💼 Your product’s duty rate depends on one word: “Anhydrous” — get it right, save thousands.