焊接助焊剂
CN → US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3810901000 | 41.5% | CN | US | Official Doc |
| 3811900000 | 41.5% | CN | US | Official Doc |
| 3810100000 | 40.0% | CN | US | Official Doc |
| 3811190000 | 41.5% | CN | US | Official Doc |
| 3810905000 | 40.0% | CN | US | Official Doc |
AI Analysis
🧪 Soldering Flux: The Unsung Hero of Metaljoining
🌐 HS Code Reference & Clearance Guide | 2026 Latest Tariff Analysis | Professional Clearance Strategy
📌 I. Product Definition: What is Soldering Flux?
Soldering Flux is a chemical cleaning agent used in the soldering, brazing, and hard-soldering processes. Its primary functions are: 1. Remove Oxides: Cleans metal surfaces by removing oxide layers. 2. Prevent Re-oxidation: Forms a protective barrier during heating. 3. Improve Wetting: Lowers surface tension, allowing solder to flow smoothly.
⚠️ Critical Classification Nuance:
- In international trade, soldering flux is generally classified under Chapter 38 (Miscellaneous Chemical Products), specifically within the heading 3810 (Preparements for soldering, brazing, welding... fluxes).
- Misclassification (e.g., as general chemicals or additives) can lead to significant tariff discrepancies and customs delays.
📦 II. HS Code Classification Details (2026 Latest Tariff Alignment)
Based on the provided data, there are five potential HS Codes for Soldering Flux, depending on its specific formulation, purity, and component logic. All listed items are subject to US Import Restrictions (Section 301 + IEEPA).
| HS Code | Product Description | Classification Logic | Tax Rate |
|---|---|---|---|
3810.10.00.00 |
Soldering Flux (General) | Direct match for "fluxes for soldering, brazing, or welding." Classified as a welding auxiliary material. | 40.0% |
3811.19.00.00 |
Soldering Flux (Chemical Additive) | Inferred to contain chemical additives; classified under "Anti-knock preparations / Prepared additives." | 41.5% |
3810.90.10.00 |
Soldering Flux (Other) | Matches "Other fluxes for soldering, brazing, or welding." Classified under "Other" chemical preparations. | 41.5% |
3811.90.00.00 |
Soldering Flux (Mineral Oil Additive Type) | Treated as an additive for mineral oils or similar liquids due to formulation logic. | 41.5% |
3810.90.50.00 |
High-Purity Soldering Flux | High-purity variant; usage fully matches "fluxes for soldering/brazing." | 40.0% |
🔍 Key Insight:
- Codes starting with 3810 are the most direct classification for fluxes.
- Codes starting with 3811 suggest the product is viewed more as a general chemical additive or oil additive rather than a dedicated welding auxiliary.
- Tariff Difference: There is a 1.5% difference between the 40% and 41.5% brackets. Precise formulation documentation is key to securing the lower rate.
💰 III. 2026 Tariff Rate Breakdown (Including Additional Duties)
✅ Applicable Country: United States (US)
✅ Country of Origin: China (CN)
✅ Effective Date: November 10, 2025 (and subsequent imports)
🎯 1. The "40.0%" Bracket (3810.10.00.00 & 3810.90.50.00)
| Item | Detail |
|---|---|
| Basic Tariff | 5.0% (Standard MFN rate for HS 3810) |
| Section 301 Tariff | +25.0% (USITC Footnote for Chinese goods) |
| Section 122 Tariff (IEEPA) | +10.0% (Additional duty on certain Chinese products) |
| Total Tariff Rate | 40.0% |
| Tax Calculation | CIF Value × 40% |
| De Minimis Exemption | ❌ Not Eligible |
| Legal Basis Path | Base Rate 5% → Section 301: +25% → IEEPA Sec 122: +10% = 40% |
📌 Explanation:
- This is the preferred classification if the product is clearly identified as a soldering flux.
- The 5% base rate is standard for Chapter 3810, but the additional duties bring the total to 40%.
🎯 2. The "41.5%" Bracket (3811.19.00.00, 3810.90.10.00, 3811.90.00.00)
| Item | Detail |
|---|---|
| Basic Tariff | 6.5% (Slightly higher base rate for specific chemical/additive subheads) |
| Section 301 Tariff | +25.0% (USITC Footnote for Chinese goods) |
| Section 122 Tariff (IEEPA) | +10.0% (Additional duty on certain Chinese products) |
| Total Tariff Rate | 41.5% |
| Tax Calculation | CIF Value × 41.5% |
| De Minimis Exemption | ❌ Not Eligible |
| Legal Basis Path | Base Rate 6.5% → Section 301: +25% → IEEPA Sec 122: +10% = 41.5% |
📌 Explanation:
- These codes often result from a broader interpretation of the chemical composition (e.g., as an "additive" rather than a dedicated "flux").
- The 1.5% higher cost is due to the higher base tariff (6.5% vs. 5%).
- Risk: If customs determines the product is clearly a flux, classifying it under 3811 (additives) might be challenged, potentially leading to audits or penalties for misclassification.
🛠️ IV. Customs Clearance Practical Advice (Avoiding Pitfalls)
✅ 1. Required Documentation Checklist
| Document | Required? | Description |
|---|---|---|
| ✅ Product Specification Sheet | ✔️ | Must clearly state: "Soldering Flux," composition, MSDS (Material Safety Data Sheet), and intended use (soldering/brazing). |
| ✅ MSDS / SDS | ✔️ | Critical for chemical imports. Must confirm flammability and hazard class. |
| ✅ Commercial Invoice | ✔️ | Must explicitly describe goods as "Soldering Flux" (not just "Chemical" or "Adhesive"). |
| ✅ Certificate of Origin | ✔️ | Required for Section 301 and IEEPA duty calculation. |
| ✅ EPA Registration | ✔️ | If the flux contains active antimicrobial or pesticidal ingredients, EPA approval is needed. Most standard soldering fluxes do not. |
| ✅ HS Code Pre-Ruling | ✔️ | Highly recommended to confirm whether it falls under 3810.10 or 3811 based on formulation. |
✅ 2. Classification Strategy & Tips
🔥 "Be Specific, Be Accurate, Avoid Ambiguity!"
| Scenario | Recommended HS Code | Why? | Risk if Misclassified |
|---|---|---|---|
| Standard Soldering Flux (Clear chemical mix for metals) | 3810.10.00.00 |
Direct legal definition match. Lowest base rate (5%). | Misclassifying as 3811 → Pay 1.5% more unnecessarily. |
| High-Purity/Industrial Flux | 3810.90.50.00 |
Specific subcategory for high-purity welding auxiliaries. | Same as above. |
| Flux with Oil Base/Additives (Complex mix) | 3810.90.10.00 or 3811.x |
If it functions primarily as an additive rather than a pure flux. | Risk of customs rejection if "additive" claim is weak. |
| General Chemical Mixture (No clear welding use) | 3811.19.00.00 |
Classified as "Other prepared additives." | High risk of seizure if invoiced as "flux" but classified as additive. |
📌 Pro Tip:
- Always declare the primary use in the commercial invoice.
- If the product is a paste or liquid, specify "Soldering Flux Paste/Liquid."
- Avoid vague terms like "Chemical Agent" or "Welding Aid" without further detail.
✅ 3. Special Considerations
| Situation | Advice |
|---|---|
| Duty drawback | If you re-export the goods within 3 years, you may claim duty drawback on the Section 301 and IEEPA portions. |
| FDA/EPA Regulations | Ensure no prohibited substances (e.g., lead in some contexts, though lead-free is common). Check EPA requirements for any active ingredients. |
| Transportation | Soldering fluxes are often flammable (contain alcohol or rosin). Ensure proper UN Number labeling for sea/air freight. |
| Origin Marking | All packages must be clearly marked "Made in China" to trigger the correct Section 301 and IEEPA duties. |
🌍 V. Global Market Comparison (2026)
| Country/Region | Recommended HS Code | Basic Tariff | Additional Duties (China) | Total Cost Impact | Notes |
|---|---|---|---|---|---|
| 🇺🇸 USA | 3810.10.00.00 |
5% | +25% (Sec 301) + 10% (IEEPA) | 40% | High barrier to entry. |
| 🇨🇳 China | 3810.10.00.00 |
0-5% | None | Low | Domestic production is strong. |
| 🇪🇺 EU | 3810.10.00 |
0-2.7% | None | Very Low | No Section 301 equivalent. |
| 🇯🇵 Japan | 3810.10.00 |
0% | None | 0% | Free trade agreement benefits may apply. |
| 🇲🇽 Mexico | 3810.10.00 |
0-5% | None | Low | USMCA may apply if originating. |
📌 Conclusion:
- The US market is the most expensive due to叠加 tariffs (5% + 25% + 10%).
- For non-US markets, soldering fluxes remain highly competitive.
📌 VI. Common Errors & Pitfalls
❌ Error 1: Declaring as "Adhesive" or "Glue"
👉 Consequence: Misclassification under Chapter 35 or 3506. May lead to higher duties or rejectance if not recognized as a chemical flux.
❌ Error 2: Ignoring IEEPA Section 122
👉 Consequence: Missing the 10% additional duty. Result: Penalties, fines, and potential seizure upon audit.
❌ Error 3: Vague Description ("Chemical Mix")
👉 Consequence: Customs will investigate. Delay in clearance, storage fees, and possible re-classification at a higher rate.
✅ Correct Declaration Example:
"SOLDERING FLUX, LIQUID, BASED ON ROBIN AND ALCOHOL, FOR ELECTRONIC SOLDERING, 500ML BOTTLE, MADE IN CHINA"
🎯 VII. Summary & Action Plan
🎯 Key Takeaway:
🔹 Best HS Code:
3810.10.00.00(40% Total Duty)
🔹 Avoid:3811codes (41.5% Total Duty) unless formulation strictly justifies it.
🔹 Must-Have Docs: MSDS, Commercial Invoice with Specific Description, Certificate of Origin.
📣 Immediate Action:
1. Review Product Formulation: Confirm if it fits the "flux" definition precisely.
2. Prepare MSDS: Ensure it is up-to-date and available for customs.
3. Calculate Landed Cost: Factor in the 40% total duty for US imports.
4. Consult Broker: File a Pre-Ruling Request with US Customs if there is any doubt about the 3810 vs. 3811 classification.
✨ Professional Clearance Starts with Accurate Classification!
💼 Save every penny by avoiding misclassification penalties!
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) — Broad category of goods (e.g., Chapter 84: Machinery and Mechanical Appliances)
- Heading (4 digits) — More specific grouping within the chapter
- Subheading (6 digits) — Internationally standardized breakdown, used by all WCO member countries
- National subdivisions (8-10 digits) — 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 — The standard duty rate applied to WTO members
- General rate — Applied to countries without trade agreements
- Trade remedy duties — 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.