Dry Film

🛡️ Dry Film (Photoresist & Protective Membranes)

🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Clearance Strategy
📌 Part I: Product Definition & Classification: What is "Dry Film"?

Dry Film, in the context of international trade and industrial manufacturing, primarily refers to photoresist films used in Printed Circuit Board (PCB) fabrication or protective membrane sheets made of plastic/polymers. It is a thin, flexible sheet material coated with a light-sensitive chemical layer (photoresist) or a protective adhesive layer, sandwiched between protective liners.

In international trade, these products are classified under Chapter 39 (Plastics and Articles Thereof), specifically within Heading 3920 (Other plates, sheets, film, foil and strip, of plastics) or 3921 (Other plates, sheets, film, foil and strip, of plastics). The precise classification depends on the material composition and chemical structure.

⚠️ Key Distinction Point:
- If the film is made of cellulose derivatives (e.g., modified cellulose) or specific chemical derivatives → Likely 3920.
- If the film is made of general plastics (e.g., PET, PVC, Polyimide) without being a "special chemical derivative" under specific subheadings → Likely 3921.
- "Deductive Rule": If it doesn't fit specific descriptions in 3920 or 3921, it falls into the "other" or "catch-all" categories.

📦 Part II: HS Code Classification Details (2026 Latest Tariff Authority对照)

🔍 Key Reminder:
- 3920.79.10.00 is for chemically modified materials, specifically those resembling cellulose derivatives or specific chemical structures. This is the most technically specific classification.
- 3921.90.x0.x0 codes are for general plastic dry films. 50.10 is for "membrane/sheet" form, while 40.10 is for "thin film" form, both falling under the "other" category.

💰 Part III: 2026 Latest Tariff Rate Breakdown (Including Surtaxes, Policy Add-ons)

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

🎯 1. 3920.79.10.00 —— Special Dry Film (Chemical Derivative/Cellulose-based)

📌 Explanation:
- Base Tariff (6.2%): Standard MFN rate for other plastic plates/sheets of chemical derivatives.
- Section 301 Surtax (25%): Additional tariff on Chinese goods under Trade Act Section 301.
- 122 Clause Tariff (10%): Specific additional tariff under US Trade Act Section 122 (or related provisions depending on current enforcement).
- Total: 6.2 + 25 + 10 = 41.2%. This is a high-cost classification.

🎯 2. 3921.90.50.10 —— Dry Film (Plastic Membrane/Sheet Form)

📌 Explanation:
- Base Tariff (4.8%): Standard rate for other plastic plates/sheets/films.
- Section 301 Surtax (25%): Applicable to all Chinese-origin plastics under Section 301.
- 122 Clause Tariff (10%): Applicable additional tariff.
- Total: 4.8 + 25 + 10 = 39.8%.

🎯 3. 3921.90.40.10 —— Dry Film (Plastic Thin-Film Form)

📌 Explanation:
- Base Tariff (4.2%): Standard rate for other plastic films/sheets (thin form).
- Section 301 Surtax (25%): Applicable to all Chinese-origin plastics under Section 301.
- 122 Clause Tariff (10%): Applicable additional tariff.
- Total: 4.2 + 25 + 10 = 39.2%.

🛠️ Part IV: Customs Clearance Practical Advice (Pitfall Avoidance Guide)

✅ 1. Documentation Checklist (Mandatory)

✅ 2. Declaration Tips (Key Mnemonic)

🔥 "Material Defines Code, Form Matters, Surtaxes Add Up!"

✅ 3. Special Situations

🌍 Part V: Global Market Comparison (2026 Latest)

📌 Conclusion:
- USA has the highest tariff burden (39.2% - 41.2%) due to Section 301 and 122 Clause tariffs.
- EU, UK, Japan, and China have standard MFN rates (5-8%), making them more cost-effective for dry film imports if origin rules allow.
- Recommendation: For US imports, verify the exact material composition carefully. If it can be classified under 3920.79.10.00 (41.2%) vs 3921.90.50.10 (39.8%), the 3921 code saves 1.4%. However, accuracy is paramount to avoid penalties. If it is truly a cellulose derivative, 3920 is the only legal choice.

📌 Part VI: Common Mistakes & Pitfall Guide (Blood & Tears Lessons)

❌ Mistake 1: Declaring all dry films as 3920.79.10.00 to match "specialty" status.
👉 Consequence: If the film is standard PET plastic, customs will reclassify it to 3921, leading to penalties for misdeclaration.

❌ Mistake 2: Ignoring the "122 Clause" (10%).
👉 Consequence: Underpaying tax by 10%. Customs will demand back payment + interest + fines.

❌ Mistake 3: Vague description "Plastic Film" on Invoice.
👉 Consequence: Customs cannot determine if it's 3920 or 3921. Leads to hold and inspection, delaying clearance by weeks.

❌ Mistake 4: Trying to split "Film" and "Protective Liner" to lower value.
👉 Consequence: Customs views them as a set. Splitting leads to higher total tax and potential seizure.

✅ Correct Practice:

"Dry Film Photoresist, PET Base, 25μm, 1220mm Width, for PCB Manufacturing, Model XYZ, China Origin"

🎯 Part VII: Conclusion: Professional Declaration, Save Time, Reduce Cost!

🎯 Remember the Mantra:

🔹 "Material Dictates Code, Form Defines Subhead, Surtaxes Hit Hard!"
🔹 "Plastic = 3921 (39.2-39.8%), Chemical = 3920 (41.2%), Accuracy = Profit!"

📌 Pro Tip:
- If your dry film is manufactured in Vietnam, Malaysia, or Thailand, you may exempt from Section 301 tariffs.
- Apply for an Advance Ruling from CBP if the chemical composition is complex. This provides legal certainty on the HS code before shipment.

📣 Call to Action:

📞 Contact a professional customs broker + Provide Product Specs + Request HS Code Advance Ruling
🚀 Ensure your dry film clears smoothly, avoids delays, and maximizes profit!

✨ Professional Customs Clearance Starts with Precise Classification!
💼 Every percentage point of tariff difference is your bottom line!