Metal Welding Flux
CN β 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 |
| 3810100000 | 40.0% | CN | US | Official Doc |
AI Analysis
π₯ Metal Welding Flux & Metal Cleaning Agents
π HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Clearance Strategy
π I. Product Definition & Classification: What Exactly Is "Welding Flux"?
Welding flux is a critical chemical aid used in welding, brazing, and hard soldering processes. Its primary functions are to remove oxide layers, protect the molten metal from atmospheric contamination, and improve wetting. In international trade, these products are often classified differently depending on their chemical composition, primary function, and formulation status.
β οΈ Key Distinction Points:
- Flux with Direct Welding Function: If the productβs primary purpose is explicitly for welding/brazing assistance, it typically falls under Heading 3810 (Metal surface treatment preparations).
- Chemical Additives/Preparations: If classified as a general chemical preparation or additive for mineral oils/liquids, it may fall under Heading 3811 or general chemical residues.
- Cleaning/Dust Removal: If the primary function is dust removal or cleaning of metal surfaces (rather than the chemical reaction for bonding), it may be classified under specific cleaning agent categories within 3810.
π¦ II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)
| HS Code | Product Description | Applicable Scenario | Key Characteristic |
|---|---|---|---|
3810.10.00.00 |
Metal Welding & Cleaning Agents | Metal surface treatment & welding-related agents; includes metal dust removal agents. | Primary function: Metal surface preparation/cleaning for welding. |
3810.90.10.00 |
Welding Flux (Chemical Preparations) | Fully matches the use of flux for welding, brazing, or hard soldering. Classified under "Other chemical preparations." | Explicitly defined as "flux" for welding/brazing. |
3811.90.00.00 |
Welding Flux as Chemical Additives | Used as an additive in mineral oils or similar liquid preparations. | Classified as a "preparation additive" for liquids. |
3811.19.00.00 |
Welding Flux with Chemical Additive Components | Contains chemical additives for liquid modulation; fits "other types" of anti-knock/modulation additives. | Focuses on the chemical additive composition within the flux. |
π Important Reminder:
-3810.10.00.00is often preferred for general-purpose welding fluxes and metal cleaning/dust removal agents because it directly addresses the application (metal treatment).
-3810.90.10.00is the specific category for fluxes that don't fit the narrower definitions of 3810.10, covering the broad "other" category for welding aids.
-3811.xxxxxxcodes are for products classified more by their chemical nature as additives rather than their direct application as a welding flux. Use these only if the product is sold primarily as an additive to other liquids, not as a standalone welding aid.
π° III. 2026 Latest Tariff Rate Details (Including Surtaxes, Policy Add-ons)
β Applicable Country: United States (US)
β Country of Origin: China (CN)
β Effective Date: From November 10, 2025 (for subsequent imports)
π― 1. 3810.10.00.00 ββ Metal Welding & Cleaning Agents
| Item | Content |
|---|---|
| Basic Tariff Rate | 5.0% (ad valorem) |
| Section 301 Surtax | +25.0% (Based on USITC Footnote for Section 301) |
| Section 122 Tariff (IEEPA) | +10.0% (Targeting specific Chinese chemical preparations) |
| Total Effective Rate | 40.0% |
| Tax Calculation | CIF Value Γ 40% |
| De Minimis Eligibility | β Not Eligible (High tariff rates disqualify from Section 321 de minimis relief) |
| Legal Basis Path | USITC:3810.10.00.00 β Section 301: 25% β IEEPA Section 122: 10% |
π Explanation:
- The 25% Section 301 tariff is the standard surtax for many chemical preparations from China.
- The 10% Section 122 tariff applies specifically to this subheading under recent executive actions targeting chemical goods.
- Base 5% is the standard MFN rate for this heading.
- Total 40% is significant for cost planning.
π― 2. 3810.90.10.00 ββ Welding Flux (Other Chemical Preparations)
| Item | Content |
|---|---|
| Basic Tariff Rate | 6.5% (ad valorem) |
| Section 301 Surtax | +25.0% |
| Section 122 Tariff (IEEPA) | +10.0% |
| Total Effective Rate | 41.5% |
| Tax Calculation | CIF Value Γ 41.5% |
| De Minimis Eligibility | β Not Eligible |
| Legal Basis Path | USITC:3810.90.10.00 β Section 301: 25% β IEEPA Section 122: 10% |
π Explanation:
- The base rate (6.5%) is slightly higher than3810.10.00.00because it is a broader "other" category.
- However, the surtaxes (25% + 10%) remain the same.
- Total 41.5% makes this the most expensive option among the valid classifications.
π― 3. 3811.90.00.00 ββ Welding Flux as Chemical Additives
| Item | Content |
|---|---|
| Basic Tariff Rate | 6.5% (ad valorem) |
| Section 301 Surtax | +25.0% |
| Section 122 Tariff (IEEPA) | +10.0% |
| Total Effective Rate | 41.5% |
| Tax Calculation | CIF Value Γ 41.5% |
| De Minimis Eligibility | β Not Eligible |
| Legal Basis Path | USITC:3811.90.00.00 β Section 301: 25% β IEEPA Section 122: 10% |
π Explanation:
- Same tax structure as3810.90.10.00.
- Only use this if the product is definitively an additive and not a primary flux. Misclassification here carries higher compliance risk.
π― 4. 3811.19.00.00 ββ Welding Flux with Chemical Additive Components
| Item | Content |
|---|---|
| Basic Tariff Rate | 6.5% (ad valorem) |
| Section 301 Surtax | +25.0% |
| Section 122 Tariff (IEEPA) | +10.0% |
| Total Effective Rate | 41.5% |
| Tax Calculation | CIF Value Γ 41.5% |
| De Minimis Eligibility | β Not Eligible |
| Legal Basis Path | USITC:3811.19.00.00 β Section 301: 25% β IEEPA Section 122: 10% |
π Explanation:
- Identical total rate of 41.5%.
- This code is for specific chemical modulation additives. It is less common for standard commercial welding fluxes unless they are formulated specifically as additives for lubricants or other liquids.
π οΈ IV. Customs Clearance Practical Advice (Pitfall Avoidance Guide)
β 1. Required Documentation Checklist (All Items Mandatory)
| Document | Required | Description |
|---|---|---|
| β Product Specification Sheet | βοΈ | Must detail chemical composition, pH, melting point, and primary intended use (e.g., "for arc welding steel"). |
| β Material Safety Data Sheet (MSDS/SDS) | βοΈ | Critical for chemical imports. Must classify correctly under GHS standards. |
| β Product Photos (Including Labeling) | βοΈ | Clear view of ingredients list, hazard symbols, and usage instructions. |
| β Commercial Invoice | βοΈ | Must explicitly state "Welding Flux for Metal Surface Treatment" or similar precise description. Avoid vague terms like "Chemical Mix." |
| β Certificate of Origin (CO) | βοΈ | To confirm China origin and apply correct surtaxes. |
| β Packing List | βοΈ | Detail net/gross weight and packaging type (drums, cans, etc.). |
β 2. Declaration Strategy (Key Mantra)
π₯ βFunction Defines Code, Composition Supports Claim, Name Must Be Precise!β
| Scenario | Correct Declaration | Wrong Approach |
|---|---|---|
| General Welding Flux | 3810.90.10.00 |
Misdeclare as general chemicals to avoid surtax β Audit Trigger |
| Metal Cleaning/Dust Remover | 3810.10.00.00 |
Declare as "Flux" β Unnecessary 1.5% extra tax |
| Flux Sold as Liquid Additive | 3811.90.00.00 |
Declare as "Welding Flux" β Misclassification Risk |
| OEM/Private Label Flux | Same as above | Change HS Code to avoid surtax β Fraud Risk |
β 3. Special Considerations
| Scenario | Handling Advice |
|---|---|
| Multi-purpose Products | If the product is both a flux AND a cleaner, choose the code that best reflects the primary commercial use. If used 50/50, consult a customs broker for a ruling. |
| Hazmat Classification | Many fluxes are corrosive or flammable. Ensure UN Number and Hazmat Declaration are accurate to avoid shipping delays or penalties. |
| Section 301 Exclusions | Check if any specific chemical formulations qualify for exclusions. Most standard welding fluxes do not qualify for current exclusions. |
| De Minimis (Section 321) | Due to the >25% tariff rate, these items do not qualify for the $800 de minimis exemption. Full formal entry is required. |
π V. Global Market Customs Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff Rate | Certification Required | Notes |
|---|---|---|---|---|
| πΊπΈ USA | 3810.10.00.00 or 3810.90.10.00 |
40.0% - 41.5% | SDS, Hazmat Declaration | High surtaxes apply. |
| π¨π³ China | 3810.10.00.00 |
5.0% | None | No surtaxes. |
| πͺπΊ EU | 3810.10.00.00 |
6.5% (duty) | REACH Registration | No 301-style surtaxes. |
| π¬π§ UK | 3810.10.00.00 |
6.5% | UK REACH | Post-Brexit rules apply. |
| π¨π¦ Canada | 3810.10.00.00 |
6.5% | WHMIS Compliance | MFN rate applies. |
π Conclusion:
- USA is the most costly market for welding flux due to Section 301 and Section 122 tariffs.
- EU/UK/Canada offer significantly lower duty rates (6.5% base), making them more cost-effective for exports if supply chains allow.
- China has the lowest base rate but is the origin point.
π VI. Common Mistakes & Pitfall Guide (Lessons Learned)
β Mistake 1: Classifying welding flux under Chapter 38 general chemicals without specifying the welding purpose.
π Consequence: Customs may reclassify to 3810.90.10.00 (41.5%) if it doesn't fit 3810.10 perfectly, or demand extra documentation.
β Mistake 2: Attempting to use Section 321 De Minimis for small shipments.
π Consequence: Shipment seized or held because high tariff rates (>25%) disqualify it from de minimis. Delays and storage fees incurred.
β Mistake 3: Inaccurate SDS/MSDS regarding chemical hazards.
π Consequence: Shipping carrier rejection, fines, or safety violations at port.
β Mistake 4: Using vague descriptions like "Chemical Powder" or "Lubricant Additive" when it is clearly a Welding Flux.
π Consequence: Customs audit, potential fraud allegations, and back-tariffs.
β Correct Practice:
βMetal Welding Flux, Powder Form, Contains Borax and Fluorides, For Use in Arc Welding Steel, HS 3810.90.10.00, SDS Availableβ
π― VII. Conclusion: Precise Classification Saves Money!
π― Remember the Mantra:
πΉ βFlux for Welding: 3810.90 (41.5%) or 3810.10 (40.0%)β
πΉ βCleaning/Dust Removal: 3810.10 (40.0%)β
πΉ βAdditives: 3811.xxxx (41.5%)β
πΉ βDe Minimis? NO. Full Entry REQUIRED.β
π Pro Tip:
- If your product is a specialized alloy welding flux, ensure the SDS explicitly states its use in welding/brazing.
- Consider Advance Rulings (Pre-classification) from CBP if the product is unique or multi-purpose. This provides legal certainty and prevents unexpected tariff spikes.
- For high-volume imports, engage a licensed customs broker to verify HS codes annually as trade policies evolve.
π£ Take Action Now:
π Contact a Customs Broker + Provide SDS + Verify Primary Use
π Ensure Smooth Clearance, Avoid Penalties, and Protect Margins!
β¨ Professional Clearance Starts with Accurate Classification!
πΌ Your Bottom Line Depends on the Details!
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.