Synthetic Rosin
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🧪 Synthetic Rosin (Hydrocarbon Resins)
🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Logistics Strategy
📌 I. Product Definition & Classification: What is "Synthetic Rosin"?
Synthetic Rosin, technically known in international trade as Hydrocarbon Resins or C9/C5 Hydrocarbon Resins, is a synthetic polymer derived from petroleum cracking by-products (such as pyrolysis gasoline). Unlike natural rosin (derived from pine trees), synthetic rosin offers superior stability, lighter color, and consistent quality.
It is primarily used as: * Adhesives: Hot melt adhesives, pressure-sensitive adhesives (PSA). * Coatings: Paints, varnishes, and sealants. * Rubber: Tire manufacturing and rubber compounding to improve tackiness. * Inks & Cosmetics: Stabilizers and viscosity modifiers.
⚠️ Critical Distinction:
- Natural Rosin (Colophony): Classified under HS 1301 (Vegetable products).
- Synthetic Rosin (Hydrocarbon Resin): Classified under HS 3901/3907/3910 (Plastics/Raw Synthetic Polymers) depending on structure and monomer composition.
- ⚠️ Common Error: Importers often mistakenly classify Synthetic Rosin under 1301 (Natural) or 1505 (Fats/Oils), leading to severe customs penalties. Synthetic rosin is a petroleum-based plastic polymer.
📦 II. HS Code Classification Details (2026 Latest Tariff Concordance)
| HS Code | Product Description | Application Scenario | Chemical Nature |
|---|---|---|---|
3907.91.00.00 |
Other polymers of cyclic olefins, in primary forms | High-grade C5/C9 resins, cyclic olefin copolymers | ✅ Petroleum-derived |
3910.00.00.00 |
Silicones in primary forms; silicone mixes | Silicone-based modified resins (less common for standard synthetic rosin) | ✅ Silicone-based |
3906.90.90.00 |
Acrylic polymers in primary forms | Acrylic-modified resins | ✅ Acrylic-based |
1301.90.00.00 |
Other natural gums, resins, gum-arabic, etc. | DO NOT USE unless it is 100% Natural Pine Rosin | ❌ Plant-based |
3824.99.99.00 |
Prepared binders for foundry molds; chemical products | Industrial adhesive mixes (if already compounded with other chemicals) | ✅ Mix/Prepared |
🔍 Key Reminder:
- Most standard "Synthetic Rosin" (C9/C5 Hydrocarbon Resin) falls under3907.91.00.00(Cyclic Olefins) or3906.90.90.00(Acrylics) if modified, but often specifically3907.91.00.00is cited for general hydrocarbon resins in many jurisdictions.
- Check Local Subheadings: Some countries may classify generic Hydrocarbon Resins under3911.90.00(Polymers of oxymethylene and other polyethers, phenolic, amino, epoxy, alkyd, polyurethane, etc.).
- Verify the MSDS: The "Monomer" listed in the Material Safety Data Sheet (MSDS) is the single most important document for HS classification.
💰 III. 2026 Latest Tariff Rate Breakdown (Including Surtaxes)
✅ Applicable Country: United States (US)
✅ Country of Origin: China (CN)
✅ Effective Date: November 10, 2025 (and subsequent imports)
🎯 1. 3907.91.00.00 —— Cyclic Olefin Polymers (Common Synthetic Resin)
| Item | Content |
|---|---|
| Base Rate | 5.3% (ad valorem) |
| USITC Surtax | +25% (under USITC Footnote 9903.88.01 for Section 301 items) |
| IEEPA Surtax | +10% (for China/HK products, effective from Nov 10, 2025) |
| Total Rate | 40.3% |
| Tax Calculation | CIF Value × 40.3% |
| De Minimis Eligibility | ❌ Not Eligible (deny_de_minimis) |
| Legal Path | IEEPA:9903.01.25 → IEEPA:9903.01.24 → USITC:3907.91.00.00 → FOOTNOTE:9903.88.01 |
📌 Explanation:
- Hydrocarbon resins are considered "chemical products" and are subject to Section 301 tariffs.
- The 10% IEEPA surcharge significantly increases the cost for Chinese-origin synthetic rosin.
- Total 40.3% makes Chinese synthetic rosin highly uncompetitive in the US market compared to Southeast Asian origins.
🎯 2. 3911.90.00.00 —— Other Phenolic/Amino/Epoxy Polymers (If classified as specialized resin)
| Item | Content |
|---|---|
| Base Rate | 5.7% |
| USITC Surtax | +25% |
| IEEPA Surtax | +10% |
| Total Rate | 40.7% |
| Tax Calculation | CIF Value × 40.7% |
| De Minimis Eligibility | ❌ Not Eligible |
📌 Note:
- If the synthetic rosin is a modified phenolic resin (common in high-temp adhesives), it may fall here.
- The rate is similarly high. Always confirm the chemical structure (CAS number) with your supplier.
🛠️ IV. Customs Clearance Practical Advice (Battle-Tested Pitfall Guide)
✅ 1. Required Documents Checklist (Non-negotiable)
| Document | Mandatory? | Notes |
|---|---|---|
| ✅ MSDS / SDS | ✔️ | Must clearly state "Hydrocarbon Resin" or "C9/C9 Hydrocarbon Resin", NOT "Natural Rosin". Include CAS Number. |
| ✅ Commercial Invoice | ✔️ | Description must be precise: "Synthetic Hydrocarbon Resin, C9 Grade, Solid Beads, CAS No. 65996-91-4". Avoid vague terms like "Plant Resin". |
| ✅ Certificate of Origin (CO) | ✔️ | Critical for proving origin. If from Vietnam/Malaysia, may qualify for IEEPA exemption. |
| ✅ Product Specification Sheet | ✔️ | Show physical state (solid/bead/liquid), melting point, softening point. |
| ✅ FDA Declaration | ✔️ | If used in food packaging adhesives, FDA compliance statement is required. |
✅ 2. Declaration Tips (Key Mnemonic)
🔥 “Synthetic is Plastic, Not Plant; CAS Number is Key to Rank!”
| Scenario | Correct Declaration | Wrong Practice |
|---|---|---|
| Standard C9/C5 Resin | 3907.91.00.00 "Hydrocarbon Resin" |
Mislabel as "Natural Rosin" (1301.90) → Fraud Risk |
| Resin with Additives | 3824.99.99 "Prepared Binding Agents" |
Declaring pure resin when it’s a mix → Misclassification |
| Liquid Resin | Ensure "Primary Form" vs. "Preparation" | Confusing solid beads (3907) with liquid mixes (3824) |
| Chinese Origin | Expect 40.3%+ Tax | Ignoring IEEPA 10% surcharge → Cash Flow Crisis |
✅ 3. Special Cases Handling
| Situation | Handling Advice |
|---|---|
| OEM/Private Label | Provide the same MSDS as the generic product. The HS code is based on composition, not branding. |
| Food-Grade Synthetic Rosin | Must include FDA 21 CFR compliance statement in the invoice. Customs may request lab tests. |
| Transshipment (e.g., via Malaysia) | Ensure substantial transformation occurs. Simple repacking does NOT change origin. If origin remains China, US tariffs still apply. |
| Small Samples (De Minimis) | NOT ELIGIBLE. Synthetic resins are exempt from the $800 de minimis threshold due to Section 301/IEEPA. All shipments are taxable. |
🌍 V. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff (China Origin) | Certification Required | Notes |
|---|---|---|---|---|
| 🇺🇸 USA | 3907.91.00.00 |
40.3% | FDA (if contact) | High tariff barrier. |
| 🇨🇳 China | 3907.91.00.00 |
0% (Import Duty) | CCC (if applicable) | Major producer/consumer. |
| 🇪🇺 EU | 3907.91.00 |
0% (Most Favored Nation) | REACH Registration | REACH compliance is mandatory for chemical substances. |
| 🇦🇺 Australia | 3907.91.00 |
5% | AICIS Registration | Import declaration required. |
| 🇯🇵 Japan | 3907.91.00 |
0%~3.2% | PSE/Practically Zero Hazard | Strict chemical safety laws. |
📌 Conclusion:
- USA: Highest cost due to 40.3% total tariff.
- EU: Zero duty but high regulatory compliance cost (REACH).
- Recommendation: For US exports, consider third-country origin (e.g., Malaysia, Vietnam) where IEEPA exemptions may apply (0-5% tariff).
📌 VI. Common Errors & Pitfalls (Lessons from Blood)
❌ Error 1: Calling it "Natural Rosin" on the Invoice
👉 Consequence: Customs flags mismatch with MSDS. Seizure + Penalty. Synthetic rosin is petroleum-based.
❌ Error 2: Ignoring IEEPA 10% Surcharge
👉 Consequence: Underpayment of duties. Back taxes + Interest upon audit.
❌ Error 3: Missing CAS Number
👉 Consequence: Customs cannot verify HS code. Shipment held for inspection (leads to demurrage fees).
❌ Error 4: Misdeclaring "Liquid" vs. "Solid"
👉 Consequence: Different HS subheadings. If solid beads are declared as liquid, classification error.
✅ Correct Approach:
"Synthetic Hydrocarbon Resin, C9 Grade, Solid Beads, CAS No. 65996-91-4, Not for Food Contact, Made in China"
🎯 VII. Conclusion: Professional Declaration, Cost Optimization
🎯 Remember the Mantra:
🔹 "Synthetic is Plastic (3907), Not Plant (1301)."
🔹 "CAS Number is Your Best Friend."
🔹 "China Origin = 40.3% Tax in USA."
📌 Pro Tip:
If your synthetic rosin is intended for the US market, explore suppliers in Malaysia or Vietnam. Even if the chemical is similar, a proper Certificate of Origin from these countries can reduce your effective tariff from 40.3% to ~5%.
📣 Immediate Action:
📞 Request MSDS with CAS Number from Supplier
📦 Verify "Made in China" on Packaging
📉 Calculate Landed Cost Including 40.3% Tax
🚀 Consider Origin Restructuring for US Exports
✨ Professional Customs Clearance Starts with Accurate Classification!
💼 Every Dollar Saved is Profit Earned!
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关于 HS 编码归类
协调制度（HS）是由世界海关组织（WCO）制定的国际贸易商品分类标准。全球 200 多个国家采用 HS 系统作为海关关税、贸易统计和进出口监管的基础。
每个 HS 编码遵循以下层级结构：
- 章（2 位）——商品大类（例如：第 84 章：机器和机械设备）
- 品目（4 位）——章内的更具体分类
- 子目（6 位）——国际通用细分，所有 WCO 成员国统一使用
- 本国细分（8-10 位）——各国自行扩展的细分编码，如美国 HTSUS 10 位编码
正确的 HS 编码归类对于顺利通关、准确缴纳关税和遵守贸易法规至关重要。错误归类可能导致海关延误、多缴关税或罚款。
从CN进口到US时，适用的关税税率可能包括：
- 最惠国（MFN）税率——适用于 WTO 成员国的标准关税税率
- 普通税率——适用于无贸易协定国家
- 贸易救济关税——附加关税，如 301 条款（反倾销）、232 条款（国家安全）或反补贴税
本页内容仅供参考。如需正式归类，请咨询当地海关或持牌报关代理。