🧱 Polyoxymethylene Sheets (POM Sheets)

🌐 HS Code Reference & Clearance Guide | 2026 Latest Tariff Analysis | Professional Level Customs Strategy

📌 I. Product Definition & Classification: Do You Really Know "POM Sheets"?

Polyoxymethylene (POM), commonly known as Acetal or Delrin, is a high-crystalline, thermoplastic engineering plastic. In international trade, it is classified based on its chemical composition and form.

• POM Sheets/Plates: Solid flat sheets or plates made entirely of Polyoxymethylene homopolymer or copolymer.
• Key Distinction:
  • If the product is a solid sheet/plate of POM, it falls under Chapter 39 (Plastics and Articles Thereof).
  • It is NOT classified as machinery parts or tools unless specifically designed as such (which is rare for generic "sheets").

⚠️ Critical Classification Point:
- If it is a sheet/plate of pure POM →归入 3908.90.70.00 / 3908.10.00.00 / 3921.90.50.50 / 3920.92.00.00 / 3920.99.50.00
- If it is a foam sheet → Would fall under 3921.90 but tax rates may differ.
- If it is filled (e.g., glass-filled POM), it may still fall under 3908 if the polymer character is retained.

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

Based on the provided data, here are the 5 potential HS Codes for Polyoxymethylene Sheets, along with their detailed tax implications.

🔍 Key Reminder:
- 3908.10 and 3908.90 are the most accurate for Polyoxymethylene (POM) sheets.
- 3920 and 3921 are used when the product is filled, reinforced, or combined with other materials, or if customs officers classify it under "other plastic plates" rather than "specific polymers."
- 3920.92.00.00 is technically incorrect for POM (as POM is an acetal, not a polyolefin like PE/PP), but may appear in error-prone datasets. Avoid using this unless specifically advised by customs brokers.

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

✅ Applicable Country: USA (US)
✅ Country of Origin: China (CN)
✅ Effective Date: From November 10, 2025 (including subsequent imports)

🎯 1. 3908.90.70.00 — Polyoxymethylene Sheets (Other)

📌 Explanation:
- "Basic Tariff 6.5%": Standard US tariff for "Other" acetal polymers in primary forms.
- "Section 301 Surcharge 25%": Applied to most Chinese plastic products under Trade Action 301.
- "IEEPA 10%": Additional tariff imposed under the International Emergency Economic Powers Act.
- Total 41.5%: This is a high tariff, requiring careful cost estimation.

🎯 2. 3908.10.00.00 — Polyoxymethylene Sheets (Primary Forms)

📌 Note:
- This code is for POM in primary shapes (plates, sheets, rods).
- Slightly lower basic tariff (6.3% vs 6.5%), but the surcharges remain the same.
- Total 41.3%: The lowest total rate among the 3908 codes.

🎯 3. 3921.90.50.50 — Other Plastic Plates, Sheets (Filled/Composite)

📌 Note:
- Use this code only if the POM sheet is filled (e.g., with carbon fiber, glass fiber) or laminated.
- Total 39.8%: Slightly lower than 3908 codes due to lower basic tariff (4.8%).
- Risk: If customs determines the product is pure POM, they may reclassify it to 3908, leading to retroactive taxes.

🎯 4. 3920.92.00.00 — Other Plates of Polyolefins

⚠️ Warning:
- POM is NOT a polyolefin. Polyolefins are PE (Polyethylene) and PP (Polypropylene).
- Using this code for POM is highly risky and likely to be challenged by customs.
- Only use if specifically advised by a customs broker who accepts the risk of misclassification.

🎯 5. 3920.99.50.00 — Other Plastic Plates, Sheets

📌 Note:
- This is a fallback code for plastic sheets not specifically listed elsewhere.
- Total 40.8%: Higher than 3921.90.50.50 and 3920.92.00.00.
- Less precise than 3908 codes for POM.

🛠️ IV. Customs Clearance Practical Advice (Battle-Tested Pitfall Avoidance Guide)

✅ 1. Required Documentation Checklist (Missing Any = Delay)

✅ 2. Declaration Tips (Key Mantra)

🔥 "Material First, Form Second, No Hidden Fillers, Tariff Clear!"

✅ 3. Special Cases Handling

🌍 V. Global Market Comparison (2026 Latest)

📌 Conclusion:
- USA is the only market imposing high additional tariffs on POM sheets from China.
- China-origin POM sheets face 41.3%–41.5% total tariffs in the US.
- Consider supply chain diversification (e.g., sourcing from Vietnam, Thailand) to avoid US surcharges.

📌 VI. Common Mistakes & Pitfall Avoidance (Blood & Tears Lessons)

❌ Mistake 1: Declaring "Plastic Sheet" without specifying "Polyoxymethylene"
👉 Consequence: Customs may assign a higher default tariff or delay clearance.

❌ Mistake 2: Using 3920.92.00.00 for POM (claiming it's a polyolefin)
👉 Consequence: Misclassification Penalty, potential audit, and retroactive taxes.

❌ Mistake 3: Not disclosing filled materials (e.g., glass-filled POM)
👉 Consequence: If declared as pure POM but found filled, customs may reclassify to 3921.90.50.50 (39.8%) and issue penalties.

❌ Mistake 4: Assuming de minimis exemption applies
👉 Consequence: No de minimis exemption for POM sheets from China. All shipments subject to full tariff.

✅ Correct Approach:

"Polyoxymethylene (POM) Homopolymer Sheets, 1220mm x 2440mm x 10mm, White, UL94 V-0 Rated, Model XYZ"

🎯 VII. Conclusion: Professional Declaration, Save Time, Reduce Costs!

🎯 Remember the Mantra:

🔹 "POM is Acetal, Not Polyolefin!"
🔹 "3908 is King for POM, 3921 for Filled!"
🔹 "USA Tariff is 41%, Plan Ahead!"

📌 Pro Tip:

If your POM sheets are originally from Vietnam, Mexico, Thailand, or Malaysia, you may qualify for IEEPA Exemption, reducing the tariff to 0%–5%.
Recommend pre-classification ruling (Advance Ruling) before shipment to avoid risks.

📣 Immediate Action:

📞 Contact a professional customs broker + Provide Product Photos + Apply for HS Code Advance Ruling
🚀 Let your POM sheets clear customs smoothly, efficiently, and profitably!

✨ Professional Clearance Starts with Accurate Classification!
💼 Every Penny of Your Cost Deserves Precision!