Casein

🧀 Casein (酪蛋白) – The "White Gold" of Dairy Trade

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

Casein, the primary protein of milk, is a versatile ingredient used in food processing, adhesives, and industrial coatings. In international trade, its classification depends heavily on its form, purity, and intended use. It is not a "one-size-fits-all" commodity.

1. Pure Casein (Technical/Food Grade):
- Defined specifically under HS Chapter 35 as "Albuminoidal substances." - High purity, often used in direct human consumption or high-end industrial applications.

2. Casein Derivatives/Concentrates:
- Treated as food additives, nutritional supplements, or dairy by-products. - Often classified under HS Chapter 21 (Miscellaneous edible preparations) or Chapter 04 (Dairy).

⚠️ Key Distinction Point:
- If the product is pure casein/caseinate (chemical definition) → Chapter 35.
- If the product is a protein concentrate, texture protein, or dried whey derivative → Chapter 21.
- Misclassification here can lead to tax differences of over 80%.

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

Based on the provided data, here are the four potential classifications for Casein, ranging from pure chemical definition to food derivative.

🔍 Critical Reminder:
- Chapter 35 (3501.xx) is the "Natural/Pure" classification. It generally has lower base tariffs but is subject to specific "122 Clause" tariffs.
- Chapter 21 (2106.xx) is the "Processed/Food" classification. It often carries higher base tariffs or specific weight-based duties, reflecting its status as a finished food ingredient.
- Do not guess: If your casein is labeled as "Nutritional Protein Powder," customs may force it into 2106.10.00.00, skyrocketing your tax bill.

💰 III. 2026 Latest Tariff Rate Details (Including Surcharges, Policy Add-ons)

✅ Applicable Country: United States (US)
✅ Origin: China (CN)
✅ Effective Date: 2025/2026 (Including subsequent imports)
❗ Note: The data reflects heavy trade tensions, with "Section 301" and "122 Clause" tariffs applying.

🎯 1. 3501.10.50.00 —— Pure Casein & Caseinates (Base Tariff 0%)

📌 Explanation:
- This is the most favorable classification for pure casein.
- The "122 Clause" is a specific add-on for certain protein/chemical goods from China.
- Total 17.5% is manageable compared to other food categories.

🎯 2. 3501.90.60.00 —— Other Casein/Caseinates (Specific Sub-category)

📌 Note:
- This code adds a weight-based duty on top of the ad valorem rates.
- For heavy shipments of low-value casein, the 0.37¢/kg can significantly increase costs.
- Best for high-value, low-weight specialized casein powders.

🎯 3. 2106.10.00.00 —— Casein as Protein Concentrate (High Risk)

📌 Warning:
- If customs classifies your product as "Protein Concentrate" (Food Additive), the tax more than doubles compared to pure casein.
- The 25% Section 301 is the standard high tariff for many food/chemical imports from China.
- This is a common pitfall: Labeling pure casein as "Protein Powder" triggers this higher rate.

🎯 4. 2106.90.09.00 —— Casein as Dairy Derivative (Highest Cost)

📌 Critical Alert:
- The 86.2¢/kg specific duty is extremely high for bulk goods.
- Example: 1,000 kg shipment = $862 in base duty alone, plus 10% of value.
- This classification is reserved for dried whey derivatives or specific dairy by-products, not pure casein.
- Avoid this classification unless your product is explicitly a whey derivative.

🛠️ IV. Customs Clearance Practical Advice (Real-World Pitfall Avoidance)

✅ 1. Documentation Checklist (Essential)

✅ 2. Declaration Strategy (Key Mantra)

🔥 "Pure Casein is 3501, Not 2106. Avoid 'Protein Concentrate'. Avoid 'Whey Derivative'."

✅ 3. Special Cases Handling

🌍 V. Global Market Comparison (2026 Latest)

📌 Conclusion:
- The USA is the most complex market due to the 122 Clause and Section 301 tariffs.
- China origin + US destination = High scrutiny.
- Pure casein (3501) is the only way to keep taxes under 20%.

📌 VI. Common Mistakes & Pitfall Guide (Lessons Learned)

❌ Mistake 1: Calling pure casein "Protein Powder" on the invoice.
👉 Result: Customs classifies it as 2106.10.00.00 → 41.4% tax instead of 17.5%.
👉 Fix: Use "Pure Casein" or "Casein Powder."

❌ Mistake 2: Ignoring the 0.37¢/kg specific duty in 3501.90.60.00.
👉 Result: For 100,000 kg shipments, this adds $37,000 to costs unexpectedly.
👉 Fix: Prefer 3501.10.50.00 if the product fits its definition.

❌ Mistake 3: Declaring whey by-products as "Casein" to avoid high dairy tariffs.
👉 Result: Customs lab test reveals high lactose/whey content → 2106.90.09.00 → 86.2¢/kg + 10%.
👉 Fix: Ensure product is >80% pure casein for Chapter 35.

❌ Mistake 4: Not providing a Certificate of Analysis (CoA).
👉 Result: Customs cannot verify purity → Delay in clearance + potential reclassification.
👉 Fix: Always attach CoA showing casein content.

✅ Correct Declaration Example:

"Casein, Pure, Powder, 95% Protein Content, For Industrial Adhesive Use, HS 3501.10.50.00"

🎯 VII. Conclusion: Precise Classification Saves Thousands!

🎯 Remember the Mantra:

🔹 "Casein is 3501, Protein is 2106."
🔹 "Pure Casein = 17.5%, Protein Powder = 41.4%, Whey Derivative = 86.2¢/kg + 10%."
🔹 "Labeling is critical. One word change, and tax doubles."

📌 Pro Tip:
- If your product is exported from China to the US, apply for a Customs Ruling (Pre-Decision) if the volume is high.
- Ensure your CoA explicitly states "Casein" and not "Milk Protein Concentrate."

📣 Immediate Action:

📞 Consult your customs broker with the CoA and Product Specification.
📝 Verify HS Code 3501.10.50.00 on your commercial invoice.
🚀 Avoid the 41.4% and 86.2¢/kg traps!

✨ Professional Customs Clearance Starts with Accurate Classification!
💼 Every percentage point saved is pure profit!