低烟焊接助剂
CN → US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3824995500 | 38.7% | CN | US | Official Doc |
| 3824995000 | 41.5% | CN | US | Official Doc |
| 3810100000 | 40.0% | CN | US | Official Doc |
| 3811190000 | 41.5% | CN | US | Official Doc |
| 3810901000 | 41.5% | CN | US | Official Doc |
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AI Analysis
🔥 Low-Smoke Soldering Flux (Halogen-Free) | 🇺🇸 US Customs Clearance Guide 2026
🌐 HS Code Classification & Duty Breakdown | 2026 Latest Tariff Analysis | Professional Compliance Strategy
📌 I. Product Definition & Core Characteristics: What is "Low-Smoke Soldering Flux"?
Low-Smoke Soldering Flux is a critical chemical auxiliary agent used in electronics manufacturing, PCB assembly, and metal joining processes. Its primary function is to remove oxide layers from metal surfaces and prevent re-oxidation during heating, ensuring high-quality solder joints.
Key Features: * "Low-Smoke": Formulated to minimize hazardous fumes and particulate matter during soldering, prioritizing worker safety and environmental compliance (RoHS/REACH). * "Halogen-Free" (无卤): Strictly excludes chlorine and bromine compounds, aligning with modern environmental standards and specific chemical categorizations. * Chemical Nature: It is a prepared chemical mixture, often containing activators, resins, solvents, and additives.
⚠️ Critical Distinction:
- If classified under 3824, it is treated as a general "Prepared Binding Agents/Chemical Products Not Elsewhere Specified."
- If classified under 3810, it is treated specifically as a "Prepared Welding/Brazing/Soft-Soldering Fluxes."
- The choice of HS Code drastically affects the "Total Tax" rate due to different base duty rates.
📦 II. HS Code Classification Matrix (2026 Authorized Reference)
Based on the provided data, there are 5 specific HS Codes applicable to this product, depending on the precise chemical composition and declared function.
| HS Code | Product Summary (Summary) | Key Classification Logic | Total Tax Rate* |
|---|---|---|---|
| 3824.99.55.00 | Halogen-free flux matching "Halogenated Hydrocarbon" attributes & chemical preparations | Classified as a specialized chemical product; emphasizes the chemical composition and halogen-free nature. | 38.7% |
| 3824.99.50.00 | Halogen-free flux matching chemical product & preparation usage | General chemical preparation category; broader application scope than 3824.99.55. | 41.5% |
| 3810.10.00.00 | Soldering flux matching welding function & metal surface treatment definition | Classified specifically as a prepared flux for welding/brazing. Focuses on function. | 40.0% |
| 3811.19.00.00 | Soldering flux matching anti-knock/modifying additive category (Chemical Additives) | Classified under Additives; implies the flux acts primarily as a chemical modifier/additive in the soldering process. | 41.5% |
| 3810.90.10.00 | Soldering flux matching soldering, brazing, or hard-soldering uses | Specific sub-category of Fluxes; intended for hard-soldering or specialized brazing applications. | 41.5% |
* Tax rates include Base Duty + Section 301 (25%) + Section 122 (10%). See Section III for details.
💰 III. 2026 Tariff Rate Detailed Breakdown (US Imports from China)
✅ Applicable Country: United States (US)
✅ Origin: China (CN)
✅ Effective Time: Current trade policies apply (Section 301 + Section 122)
🎯 1. HS Code 3824.99.55.00 – The "Halogen-Free Chemical" Route (Lowest Duty)
| Item | Detail |
|---|---|
| Summary | Halogen-free flux, matching "halogenated hydrocarbon" attributes & chemical preparations. |
| Base Duty | 3.7% |
| Section 301 Duty | 25.0% (25% additional duty on Chinese goods under US Trade Law Section 301) |
| Section 122 Duty | 10.0% (Additional 10% duty under Section 122) |
| Total Duty Rate | 38.7% |
| Tax Calculation | CIF Value × 38.7% |
| De Minimis Exemption | ❌ Not Eligible |
| Legal Basis Path | Base Tariff → Section 301 Footnote → Section 122 |
📌 Why this code?
This code offers the lowest total tax rate (38.7%) among the options. It is suitable if the flux is marketed primarily as a specialized chemical preparation with halogen-free properties, rather than a standard industrial welding flux.
🎯 2. HS Code 3810.10.00.00 – The "Prepared Flux" Route (Standard Option)
| Item | Detail |
|---|---|
| Summary | Soldering flux, matching welding function & metal surface treatment definition. |
| Base Duty | 5.0% |
| Section 301 Duty | 25.0% |
| Section 122 Duty | 10.0% |
| Total Duty Rate | 40.0% |
| Tax Calculation | CIF Value × 40.0% |
| De Minimis Exemption | ❌ Not Eligible |
| Legal Basis Path | Base Tariff → Section 301 Footnote → Section 122 |
📌 Why this code?
This is the standard classification for soldering/brazing fluxes. It is the most common and defensible classification if the product is explicitly labeled as "Soldering Flux" for metal surface treatment. The 40.0% rate is slightly higher than 3824.99.55.00 but more functionally accurate for general electronics soldering.
🎯 3. HS Code 3824.99.50.00 – The "General Chemical" Route (Higher Duty)
| Item | Detail |
|---|---|
| Summary | Halogen-free flux, matching chemical products & preparation usage. |
| Base Duty | 6.5% |
| Section 301 Duty | 25.0% |
| Section 122 Duty | 10.0% |
| Total Duty Rate | 41.5% |
| Tax Calculation | CIF Value × 41.5% |
| De Minimis Exemption | ❌ Not Eligible |
📌 Note:
Base duty is higher (6.5% vs 3.7% or 5.0%). Use this only if the product cannot be strictly classified as a "halogenated hydrocarbon match" (3824.99.55.00) but still fits general chemical preparations.
🎯 4. HS Code 3811.19.00.00 – The "Chemical Additive" Route
| Item | Detail |
|---|---|
| Summary | Soldering flux, matching chemical additives (anti-knock/modifying) category. |
| Base Duty | 6.5% |
| Section 301 Duty | 25.0% |
| Section 122 Duty | 10.0% |
| Total Duty Rate | 41.5% |
| Tax Calculation | CIF Value × 41.5% |
| De Minimis Exemption | ❌ Not Eligible |
📌 Why this code?
This is a niche classification. It applies if the flux is technically defined as a "modifying additive" rather than a primary welding agent. Riskier classification; ensure product MSDS supports this chemical nature.
🎯 5. HS Code 3810.90.10.00 – The "Hard Soldering" Route
| Item | Detail |
|---|---|
| Summary | Soldering flux, matching soldering, brazing, or hard-soldering uses. |
| Base Duty | 6.5% |
| Section 301 Duty | 25.0% |
| Section 122 Duty | 10.0% |
| Total Duty Rate | 41.5% |
| Tax Calculation | CIF Value × 41.5% |
| De Minimis Exemption | ❌ Not Eligible |
📌 Why this code?
Specifically for hard-soldering or specialized brazing fluxes. If your "low-smoke flux" is designed for high-temperature metal joining (not electronics PCBs), this is the correct functional code.
🛠️ IV. Customs Clearance Practical Advice (Avoid Pitfalls)
✅ 1. Document Checklist (Mandatory)
| Document | Required? | Purpose |
|---|---|---|
| MSDS (Material Safety Data Sheet) | ✅ Critical | Proves "Low-Smoke" & "Halogen-Free" chemical composition. Must match HS Code classification. |
| Product Specification Sheet | ✅ Yes | Details activators, resins, and solvent types. Helps customs verify if it's a "Flux" (3810) or "Chemical Prep" (3824). |
| Commercial Invoice | ✅ Yes | Must clearly state: "Halogen-Free Low-Smoke Soldering Flux" and HS Code. |
| Proof of Origin | ✅ Yes | CO (Certificate of Origin) to confirm Chinese origin (subject to 25%+10% duties). |
| Labeling (English) | ✅ Yes | Must include hazard warnings, ingredients, and manufacturer details. |
✅ 2. Classification Strategy & Risk Management
🔥 "Function vs. Composition: Choose Wisely!"
| Scenario | Recommended HS Code | Reasoning |
|---|---|---|
| Electronics PCB Assembly Flux | 3810.10.00.00 |
Most accurate for "soldering flux." Functional classification. |
| Specialty Halogen-Free Chemical Flux | 3824.99.55.00 |
Best for Tax Saving (38.7%). If you can argue it's a specialized chemical prep rather than standard flux. |
| High-Temp Hard Soldering Flux | 3810.90.10.00 |
Functional match for hard-soldering/brazing. |
| Additive-Mixed Flux | 3811.19.00.00 |
Only if MSDS emphasizes "chemical additive/modifier" properties. |
⚠️ Risk Alert:
- Misclassification Penalty: Declaring a standard flux as a "chemical preparation" (3824) to save duty may lead to Customs audits. Ensure your MSDS and product description support the chemical nature. - "Low-Smoke" Claim: Must be supported by lab tests. False advertising claims can lead to regulatory fines beyond customs duties.
✅ 3. Special Cases
| Case | Handling Tip |
|---|---|
| Mixed Containers | If containers hold both flux and non-flux items, declare separately. Mixing can lead to blanket valuation errors. |
| OEM/White Label | Provide original brand MSDS. Customs looks at chemical composition, not just the label. |
| Small Samples (< $800) | Still subject to 38.7%~41.5% duty. Section 321 de minimis exemption does NOT apply to goods subject to Section 301 and 122 duties from China. |
🌍 V. Global Market Comparison (2026)
| Country | Recommended HS | Base Duty | Additional Duties (China) | Total Est. Duty | Notes |
|---|---|---|---|---|---|
| 🇺🇸 USA | 3824.99.55.00 |
3.7% | +25% (Sec 301) +10% (Sec 122) | 38.7% | Best option for cost. |
| 🇺🇸 USA | 3810.10.00.00 |
5.0% | +25% (Sec 301) +10% (Sec 122) | 40.0% | Standard flux classification. |
| 🇨🇳 China | 3824.99.55.00 |
3.7% | None | 3.7% | Import duty to China (if applicable). |
| 🇪🇺 EU | 3824.99.50 |
0-6.5% | None | 0-6.5% | No Section 301/122. Check REACH compliance. |
| 🇯🇵 Japan | 3824.99.90 |
0-8% | None | 0-8% | Check FFI (Fuel Tax) and environmental laws. |
📌 VI. Common Mistakes & Pitfalls (Learn from Others)
❌ Mistake 1: Claiming "De Minimis" exemption for small shipments of flux.
👉 Consequence: Customs will assess full 38.7%-41.5% duty + penalties. China-origin goods are excluded from de minimis for Sec 301/122.
❌ Mistake 2: Using vague descriptions like "Cleaning Liquid" or "Adhesive" on the invoice.
👉 Consequence: Customs may reclassify to a higher duty rate or deny entry for lack of proper documentation (MSDS).
❌ Mistake 3: Ignoring the "Halogen-Free" claim.
👉 Consequence: If the product contains halogens, it may violate environmental regulations in certain US states or customer contracts, leading to returns even if customs clears it.
✅ Best Practice:
"Declare precisely. Provide MSDS. Match HS Code to Function/Composition. Pay the Duty."
🎯 VII. Conclusion: Optimize Your Clearance
🎯 Key Takeaway:
For Low-Smoke Halogen-Free Soldering Flux imported into the US from China:
1. Lowest Duty: 3824.99.55.00 at 38.7% (if chemical composition allows).
2. Standard Duty: 3810.10.00.00 at 40.0% (most common for fluxes).
3. No De Minimis: All shipments are subject to these duties.
📌 Action Step:
📞 Consult a Customs Broker to review your MSDS and Product Spec.
📄 Ensure "Halogen-Free" is certified.
📦 Prepare for 38.7%~41.5% duty costs in your pricing model.
✨ Precision in Classification = Profit in Your Pocket!
💼 Don't let customs duty eat your margins. Know your HS Code!
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.