Synthetic Rosin
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π§ͺ Synthetic Rosin (Hydrocarbon Resins)
π HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Logistics Strategy
π 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.
β οΈ 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.
- β οΈ 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.
π¦ 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 | β Petroleum-derived |
3910.00.00.00 |
Silicones in primary forms; silicone mixes | Silicone-based modified resins (less common for standard synthetic rosin) | β Silicone-based |
3906.90.90.00 |
Acrylic polymers in primary forms | Acrylic-modified resins | β Acrylic-based |
1301.90.00.00 |
Other natural gums, resins, gum-arabic, etc. | DO NOT USE unless it is 100% Natural Pine Rosin | β Plant-based |
3824.99.99.00 |
Prepared binders for foundry molds; chemical products | Industrial adhesive mixes (if already compounded with other chemicals) | β Mix/Prepared |
π 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.
π° III. 2026 Latest Tariff Rate Breakdown (Including Surtaxes)
β Applicable Country: United States (US)
β Country of Origin: China (CN)
β Effective Date: November 10, 2025 (and subsequent imports)
π― 1. 3907.91.00.00 ββ 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 Γ 40.3% |
| De Minimis Eligibility | β Not Eligible (deny_de_minimis) |
| Legal Path | IEEPA:9903.01.25 β IEEPA:9903.01.24 β USITC:3907.91.00.00 β FOOTNOTE:9903.88.01 |
π 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.
π― 2. 3911.90.00.00 ββ 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 Γ 40.7% |
| De Minimis Eligibility | β Not Eligible |
π 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.
π οΈ IV. Customs Clearance Practical Advice (Battle-Tested Pitfall Guide)
β 1. Required Documents Checklist (Non-negotiable)
| Document | Mandatory? | Notes |
|---|---|---|
| β MSDS / SDS | βοΈ | Must clearly state "Hydrocarbon Resin" or "C9/C9 Hydrocarbon Resin", NOT "Natural Rosin". Include CAS Number. |
| β Commercial Invoice | βοΈ | Description must be precise: "Synthetic Hydrocarbon Resin, C9 Grade, Solid Beads, CAS No. 65996-91-4". Avoid vague terms like "Plant Resin". |
| β Certificate of Origin (CO) | βοΈ | Critical for proving origin. If from Vietnam/Malaysia, may qualify for IEEPA exemption. |
| β Product Specification Sheet | βοΈ | Show physical state (solid/bead/liquid), melting point, softening point. |
| β FDA Declaration | βοΈ | If used in food packaging adhesives, FDA compliance statement is required. |
β 2. Declaration Tips (Key Mnemonic)
π₯ βSynthetic is Plastic, Not Plant; CAS Number is Key to Rank!β
| Scenario | Correct Declaration | Wrong Practice |
|---|---|---|
| Standard C9/C5 Resin | 3907.91.00.00 "Hydrocarbon Resin" |
Mislabel as "Natural Rosin" (1301.90) β Fraud Risk |
| Resin with Additives | 3824.99.99 "Prepared Binding Agents" |
Declaring pure resin when itβs a mix β 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 β Cash Flow Crisis |
β 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. |
π V. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff (China Origin) | Certification Required | Notes |
|---|---|---|---|---|
| πΊπΈ USA | 3907.91.00.00 |
40.3% | FDA (if contact) | High tariff barrier. |
| π¨π³ China | 3907.91.00.00 |
0% (Import Duty) | CCC (if applicable) | Major producer/consumer. |
| πͺπΊ EU | 3907.91.00 |
0% (Most Favored Nation) | REACH Registration | REACH compliance is mandatory for chemical substances. |
| π¦πΊ Australia | 3907.91.00 |
5% | AICIS Registration | Import declaration required. |
| π―π΅ Japan | 3907.91.00 |
0%~3.2% | PSE/Practically Zero Hazard | Strict chemical safety laws. |
π 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).
π VI. Common Errors & Pitfalls (Lessons from Blood)
β Error 1: Calling it "Natural Rosin" on the Invoice
π Consequence: Customs flags mismatch with MSDS. Seizure + Penalty. Synthetic rosin is petroleum-based.
β Error 2: Ignoring IEEPA 10% Surcharge
π Consequence: Underpayment of duties. Back taxes + Interest upon audit.
β Error 3: Missing CAS Number
π Consequence: Customs cannot verify HS code. Shipment held for inspection (leads to demurrage fees).
β Error 4: Misdeclaring "Liquid" vs. "Solid"
π Consequence: Different HS subheadings. If solid beads are declared as liquid, classification error.
β Correct Approach:
"Synthetic Hydrocarbon Resin, C9 Grade, Solid Beads, CAS No. 65996-91-4, Not for Food Contact, Made in China"
π― VII. Conclusion: Professional Declaration, Cost Optimization
π― Remember the Mantra:
πΉ "Synthetic is Plastic (3907), Not Plant (1301)."
πΉ "CAS Number is Your Best Friend."
πΉ "China Origin = 40.3% Tax in USA."
π 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%.
π£ Immediate Action:
π Request MSDS with CAS Number from Supplier
π¦ Verify "Made in China" on Packaging
π Calculate Landed Cost Including 40.3% Tax
π Consider Origin Restructuring for US Exports
β¨ Professional Customs Clearance Starts with Accurate Classification!
πΌ Every Dollar Saved is Profit Earned!
Customer Reviews
About HS Code Classification
The Harmonized System (HS) is an internationally standardized nomenclature developed by the World Customs Organization (WCO) to classify traded products. Over 200 countries use the HS system as the basis for customs tariffs, trade statistics, and import/export regulations.
Each HS code follows a hierarchical structure:
- Chapter (2 digits) β Broad category of goods (e.g., Chapter 84: Machinery and Mechanical Appliances)
- Heading (4 digits) β More specific grouping within the chapter
- Subheading (6 digits) β Internationally standardized breakdown, used by all WCO member countries
- National subdivisions (8-10 digits) β Country-specific extensions for further classification, such as US HTSUS 10-digit codes
Correct HS code classification is essential for smooth customs clearance, accurate duty payment, and compliance with trade regulations. Misclassification can lead to customs delays, overpayment of duties, or penalties.
When importing from CN to US, the applicable tariff rates may include:
- Most-Favored-Nation (MFN) rate β The standard duty rate applied to WTO members
- General rate β Applied to countries without trade agreements
- Trade remedy duties β Additional tariffs such as Section 301 (anti-dumping), Section 232 (national security), or countervailing duties
The information provided on this page is for reference purposes only. For official classification, please consult with your local customs authority or a licensed customs broker.