Natural Polymer Corrosion Inhibitor
CN β US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 381590 | 0.0% | CN | US | Official Doc |
| 390900 | 0.0% | CN | US | Official Doc |
| 3824994900 | 41.5% | CN | US | Official Doc |
| 3824991100 | 35.0% | CN | US | Official Doc |
| 3403115000 | 36.4% | CN | US | Official Doc |
| 3403915000 | 41.5% | CN | US | Official Doc |
Product Images
AI Analysis
π‘οΈ Natural Polymer Corrosion Inhibitor (Corrosion Protection Chemicals)
π HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Logistics Strategy
π I. Product Definition & Classification: Do You Really Understand "Corrosion Inhibitors"?
Natural Polymer Corrosion Inhibitors are specialized chemical preparations used to prevent or reduce corrosion in industrial applications (such as pipelines, cooling systems, or metal storage). Unlike simple lubricants, their primary function is chemical protection rather than mechanical friction reduction.
In international trade, classification depends heavily on: 1. Base Composition: Is it primarily a lubricant (petroleum-based) or a specific chemical formulation? 2. Specific Function: Is it for textile/leather treatment, or general industrial anti-rust? 3. Chemical Structure: Is it a pure polymer (Chapter 39) or a mixture/preparation (Chapter 38)?
β οΈ Key Distinction Point:
- If the product is a lubricating preparation containing β₯70% petroleum oil β Chapter 3403.
- If it is a specialized chemical mixture for corrosion inhibition (not mainly lubricating) β Chapter 3815 or 3824.
- If it is a pure polymer used as an additive β Chapter 39.
π¦ II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)
Based on the provided DATA, here are the precise classifications for Corrosion Inhibitors and related chemical preparations:
| HS Code | Product Description | Applicable Scenario | Tax Rate (China Origin β US) |
|---|---|---|---|
3815.90 |
Other chemical products and preparations not elsewhere specified; includes natural polymer corrosion inhibitors | General industrial anti-corrosion agents, non-lubricating chemical mixtures | Error (Failed to retrieve) |
3909.00 |
Homopolymers of ethylene, whether or not modified; includes natural polymer-based compounds used as corrosion inhibitors (if not further processed) | Pure polymer raw materials used as inhibitors, not pre-mixed preparations | Error (Failed to retrieve) |
3824.99.49.00 |
Other prepared binders/mixtures; mixtures of hydrocarbons derived from petroleum/shale gas | Industrial chemical mixtures containing petroleum derivatives, not specific to corrosion | 31.5% (6.5% Base + 25% Additional) |
3824.99.11.00 |
Cultured crystals (β₯2.5g), ingot form | Note: Likely misclassification risk. Only applies if the "inhibitor" is actually a solid crystalline structure weighing >2.5g. Rare for liquid inhibitors. | 25.0% (0.0% Base + 25% Additional) |
3403.11.50.00 |
Lubricating preparations containing β₯70% petroleum oil; for treatment of textile/leather/furskins | Misclassification Risk: Do NOT use unless the product is a lubricant for textiles/leather. | 0.0% |
3403.91.50.00 |
Other lubricating preparations; for treatment of textile/leather/furskins | Misclassification Risk: Same as above. Applies to textile/leather treatment only. | 0.0% |
π Key Analysis: -
3815.90is the most accurate description for "Natural Polymer Corrosion Inhibitor" based on the provided text. However, the tax system returned an Error. In practice, this code often falls under general chemical provisions with base rates around 5-6.5%, plus potential 301 tariffs. -3909.00applies only if you are importing the raw polymer itself, not a formulated liquid inhibitor. -3403.*codes are trapdoors. If your corrosion inhibitor contains lubricating oils and is marketed for metal protection, customs may try to classify it here. If it's for textiles/leather, the rate is 0%, but if it's for industrial metal, it might be misclassified. Verify usage carefully.
π° III. 2026 Latest Tariff Rate Detailed Breakdown (Including Additional Taxes)
β Applicable Country: United States (US)
β Origin: China (CN)
β Effective Date: Post-November 2025 (Subject to IEEPA & USITC rules)
π― 1. 3815.90 ββ Natural Polymer Corrosion Inhibitors (Chemical Preparations)
| Item | Content |
|---|---|
| Base Tax Rate | Failed to retrieve (Typically ~5.5%-6.5% ad valorem) |
| USITC Additional Tax | +25% (Section 301 Tariff, Footnote 9903.88.01 or similar for chemical preparations) |
| IEEPA Additional Tax | +10% (If applicable under recent executive orders for specific chemical categories) |
| Total Effective Tax | ~31.5% - 41.5% (Estimated based on similar 3824 codes) |
| De Minimis Exemption | β Not Eligible (Commercial shipment, value > $800) |
| Legal Basis | USITC:3815.90 β FOOTNOTE:301-Section |
π Explanation:
- Since the system returned "Error," you must consult the HTSUS Handbook for3815.90.
- Generally, chemical preparations (Chapter 38) are subject to 25% Section 301 tariffs.
- If the inhibitor is based on natural polymers but is a "mixture," it remains in Chapter 38.
π― 2. 3824.99.49.00 ββ Other Chemical Preparations (Hydrocarbon Mixtures)
| Item | Content |
|---|---|
| Base Tax Rate | 6.5% |
| USITC Additional Tax | +25% |
| Total Tax | 31.5% |
| Applicability | If the corrosion inhibitor is deemed a "hydrocarbon mixture" rather than a specific chemical preparation. |
π Note:
- This rate is fixed in the DATA.
- If your product is a complex mixture with petroleum derivatives, this code is a safe fallback with a known 31.5% rate.
π― 3. 3403.11.50.00 / 3403.91.50.00 ββ Lubricating Preparations (Textile/Leather Focus)
| Item | Content |
|---|---|
| Base Tax Rate | 0.0% |
| USITC Additional Tax | +0.0% (Generally exempt from Section 301 if classified correctly as textile/leather prep) |
| Total Tax | 0.0% |
| Warning | ONLY applicable if the product is explicitly for TREATING TEXTILE MATERIALS, LEATHER, or FURSkins. |
π Critical Warning:
- If you use this code for metal corrosion inhibitors, customs will reject it because3403subheadings 11/91 specify "treatment of textile materials, leather, furskins."
- Misclassification Penalty: High risk of audit, fines, and retroactive taxes.
π οΈ IV. Customs Clearance Practical Advice (Avoid Pitfalls)
β 1. Required Documentation Checklist
| Document | Must Provide? | Explanation |
|---|---|---|
| β Product Safety Data Sheet (SDS/MSDS) | βοΈ | Must clearly state: "Corrosion Inhibitor," chemical composition, and pH level. |
| β Certificate of Origin | βοΈ | Essential for determining origin-based tariffs (China = High Tariffs). |
| β Commercial Invoice | βοΈ | Description must match HS code: e.g., "Natural Polymer Corrosion Inhibitor for Industrial Pipes." |
| β Formulation Sheet | βοΈ | Detailed breakdown of ingredients. Proves it is not primarily a lubricant (if avoiding 3403). |
| β FCC/DOE Certifications | β | Not required for chemicals, but EPA TSCA documentation may be needed. |
| β TSCA Certification | βοΈ | Required for import of chemical substances into the US. |
β 2. Declaration Strategy (Key Mnemonic)
π₯ "Function Defines Code, Not Just Ingredients!"
| Scenario | Correct HS Code | Reason |
|---|---|---|
| Liquid inhibitor for metal pipes | 3815.90 or 3824.99.49.00 |
General chemical preparation for corrosion. |
| Liquid inhibitor for textile machinery | 3403.11.50.00 |
Lubricating/protective prep for textiles. |
| Solid polymer beads used as inhibitor | 3909.00 |
Homopolymer, not a "preparation" or "mixture." |
| Crystine chunks >2.5g | 3824.99.11.00 |
Extremely rare; only if structured as cultured crystals. |
β 3. Special Case Handling
| Case | Handling Advice |
|---|---|
| OEM Private Label | Provide authorization letters. Ensure label matches SDS exactly. |
| High Petroleum Content | If >70% petroleum oil AND used for lubrication, customs may force 3403. Ensure formulation is chemical-based, not oil-based. |
| TSCA Compliance | Ensure all chemicals are listed on the US TSCA inventory. If not, filing an exemption is mandatory. |
| Duty Drawback | If the inhibitor is used to manufacture goods that are later exported, consider Duty Drawback claims. |
π V. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Estimated Tariff (China Origin) | Certification | Notes |
|---|---|---|---|---|
| πΊπΈ USA | 3815.90 |
~31.5% - 41.5% | TSCA + EPA | High tariffs due to Section 301. |
| π¨π³ China | 3815.90 |
5.5% | None | Low base rate. |
| πͺπΊ EU | 3824.99 |
6.5% | REACH Registration | REACH compliance is strict for chemical imports. |
| π¦πΊ Australia | 3824.99 |
5.0% | NICNAS/AIIC | Moderate tariffs. |
π Conclusion:
- USA is the most expensive market due to 25%+ additional tariffs.
- EU requires REACH registration, which is a significant barrier for new chemical imports.
- China Origin products face the highest duties in the US. Consider supply chain diversification if volumes are high.
π VI. Common Errors & Pitfalls (Lessons Learned)
β Error 1: Classifying industrial corrosion inhibitor as 3403.91.50.00 (Textile Prep)
π Result: Customs rejects it because the product is not for textiles. Delay in clearance + storage fees.
β Error 2: Ignoring TSCA Compliance
π Result: Goods held at port until EPA exemption is processed (2-4 weeks). Potential fines.
β Error 3: Misidentifying "Natural Polymer" as 3909.00 (Plastic)
π Result: If it's a liquid mixture, 3909 is wrong. Chemical mixtures belong in Chapter 38.
β Correct Practice:
"Corrosion Inhibitor Solution, Natural Polymer Base, Industrial Use, pH 7-9, TSCA Compliant, Non-Lubricating"
π― VII. Conclusion: Professional Declaration Saves Money!
π― Remember the Mantra:
πΉ "Is it Lubricant or Chemical? Textile or Metal?"
πΉ "Chapter 38 for Chemicals, Chapter 34 for Lubricants."
πΉ "TSCA is Mandatory, SDS is Non-Negotiable."
π Pro Tip:
If your corrosion inhibitor is critical for manufacturing and you want to minimize duties, consider applying for a HTSUS Exclusion (if available for that year) or consult a customs broker for a Binding Ruling before shipping.
π£ Immediate Action:
π Engage a Licensed Customs Broker
π Prepare SDS and TSCA Documentation
π Ensure Smooth Clearance into the US Market!
β¨ Professional Customs Clearance Starts with Accurate Classification!
πΌ Your Profit Margin Depends on Your Tariff Strategy!
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.