High Strength Casting Adhesive
CN β US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3506915000 | 37.1% | CN | US | Official Doc |
| 3506105000 | 37.1% | CN | US | Official Doc |
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ποΈ High Strength Casting Adhesive (Industrial Adhesives)
π HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Clearance Strategy
π I. Product Definition & Classification: What Exactly is "High Strength Casting Adhesive"?
High Strength Casting Adhesives are specialized industrial bonding agents designed to bond metals, composites, or structural materials under high-stress conditions, often mimicking the properties of welding or casting but without the heat. In international trade, these products fall strictly under Chapter 35: Albuminoidal Substances; Modified Starches; Glues; Enzymes.
They are generally classified based on their packaging and base polymer:
1. Retail-Packaged Adhesives (< 1 kg): Products sold in small bottles, tubes, or cartridges for direct consumer or small-scale industrial use, with a net weight not exceeding 1 kg. These are often 2-part epoxy or cyanoacrylate systems.
2. Bulk/Industrial Prepared Adhesives: Products used in manufacturing or construction, not meeting the specific retail criteria, or exceeding 1 kg. These are often based on specific polymers of Chapter 39.
β οΈ Key Classification Point:
- If the adhesive is polymer-based (e.g., Epoxy, Phenolic, Polyurethane from headings 3901-3913) and packaged for retail (β€ 1 kg) β HS 3506.10
- If the adhesive is polymer-based (e.g., Epoxy, Phenolic, Polyurethane from headings 3901-3913) and is NOT retail-packaged or > 1 kg, or is a "preparation" not elsewhere specified β HS 3506.91
- Note: Adhesives based on rubber fall under specific subheadings, but most high-strength casting adhesives are polymer/epoxy-based.
π¦ II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)
Based on the provided <DATA>, here are the two relevant HS codes for High Strength Casting Adhesives:
| HS Code | Product Description | Packaging Condition | Base Material | Net Weight Limit |
|---|---|---|---|---|
3506.10.50.00 |
Products suitable for use as glues or adhesives, put up for retail sale | Retail Packaged (Small bottles, tubes, cartridges) | Any suitable adhesive (non-specified elsewhere) | β€ 1 kg |
3506.91.50.00 |
Other adhesives based on polymers of headings 3901 to 3913 or on rubber | Industrial/Bulk/Non-Retail or Preparation | Polymers (Epoxies, Phenolics, Polyesters, etc.) | No Limit (but not retail β€1kg specific subcategory) |
π Critical Distinction:
-3506.10.50.00is for "Retail Sale" items. If you sell a 500g tube of high-strength epoxy to a DIY customer, this is the code.
-3506.91.50.00is for "Prepared Glues... Not Elsewhere Specified" based on polymers. This is typically used for larger containers (e.g., 5kg buckets, industrial cartridges) or complex chemical preparations where the base is a polymer from Chapter 39 (e.g., Epoxy Resins).
- Do not use generic "Glue" codes (3506.99) if the adhesive is explicitly polymer-based (3901-3913), as 3506.91 is more specific.
π° III. 2026 Latest Tariff Rate Details (Including Surcharges & Policy Add-ons)
β Applicable Country: United States (US)
β Origin: China (CN)
β Effective Date: 2025/2026 Import Period
π― 1. 3506.10.50.00 ββ Retail Packaged Adhesives (β€ 1 kg)
| Item | Content |
|---|---|
| Base Tariff Rate | 0.0% (Ad Valorem) |
| Section 301 Additional Duty | 0.0% |
| IEEPA Additional Duty | 0.0% |
| Total Tariff Rate | 0.0% |
| Tax Calculation | CIF Value Γ 0.0% = $0 |
| De Minimis Eligibility | β Yes (If value β€ $800, no duty owed regardless of rate) |
| Legal Basis Path | HTSUS 3506.10 β USITC Data β No Footnote 301 Application for this specific sub-subheading |
π Explanation:
- This category is currently exempt from the major 7.5% or 25% Section 301 tariffs that affect many other chemical products.
- The "0.0%" total tax makes this a highly competitive classification for small-batch or e-commerce retail sales.
- Verification Note: Ensure the product is truly "put up for retail sale." If it is in bulk drums, this code may be rejected by Customs.
π― 2. 3506.91.50.00 ββ Polymer-Based Adhesives (Industrial/Prepared)
| Item | Content |
|---|---|
| Base Tariff Rate | 0.0% (Ad Valorem) |
| Section 301 Additional Duty | 0.0% |
| IEEPA Additional Duty | 0.0% |
| Total Tariff Rate | 0.0% |
| Tax Calculation | CIF Value Γ 0.0% = $0 |
| De Minimis Eligibility | β Yes (If value β€ $800) |
| Legal Basis Path | HTSUS 3506.91 β USITC Data β No Footnote 301 Application |
π Explanation:
- Despite being "High Strength" and potentially used in critical structural applications, if the base is a polymer (like Epoxy, which is often listed in Chapter 39) and falls under "Other prepared adhesives," it is also classified at 0.0%.
- This is a significant advantage for industrial suppliers. Many users fear high tariffs on chemicals, but this specific adhesive subclass is duty-free.
- Caution: If the adhesive is based on rubber (not polymers 3901-3913), it might fall under a different subheading (e.g., 3506.91.00.00 or 3506.99), but the provided data indicates 3506.91.50.00 covers polymer-based adhesives with 0% tax.
π οΈ IV. Customs Clearance Practical Advice (Real-World Pitfall Guide)
β 1. Required Documentation Checklist (Non-Negotiable)
| Document | Must Provide | Description |
|---|---|---|
| β Safety Data Sheet (SDS) | βοΈ | Critical for adhesives. Must be GHS compliant. Shows if hazardous. |
| β Product Formula/Composition | βοΈ | Must specify % of polymers (Headings 3901-3913) vs. other components. |
| β Commercial Invoice | βοΈ | Clearly state "High Strength Casting Adhesive" AND "Not for Retail Sale" OR "Put up for Retail Sale". |
| β Proof of Retail Packaging | βοΈ | If using 3506.10.50.00, provide photos of small retail boxes/tubes. |
| β Bulk/Industrial Proof | βοΈ | If using 3506.91.50.00, provide photos of drums, totes, or large cartridges. |
| β MSDS/HAZMAT Declaration | βοΈ | Required for air/sea freight. Adhesives may be flammable or corrosive. |
β 2. Declaration Strategy (Key Mnemonics)
π₯ "Packaging Dictates Code, Polymer Dictates Subcode!"
| Scenario | Correct HS Code | Wrong Practice | Consequence |
|---|---|---|---|
| 500g Tube sold to end-user | 3506.10.50.00 |
Declaring as Bulk | Code mismatch β Delay |
| 5kg Bucket sold to factory | 3506.91.50.00 |
Declaring as Retail | Code mismatch β Delay |
| Adhesive based on Rubber | Check 3506.91.00.00 or 3506.99 |
Using 3506.91.50.00 |
Tax Error (May still be 0%, but description wrong) |
| Non-Polymer Glue (e.g., Animal Glue) | Different Chapter (35.02/35.03) | Using 3506.91.50.00 |
Rejection |
π Note on "High Strength":
- The term "High Strength" is a marketing term, not a customs classification term. Do not rely on this word for classification. Focus on Chemical Composition (Polymer? Rubber? Protein?) and Packaging (Retail β€1kg?).
β 3. Special Handling Cases
| Case | Handling Advice |
|---|---|
| Epoxy Resin (Part A + Part B) | Declare as one unit if sold together. If shipped separately, each part may need separate classification if they are reactive. Usually, the final adhesive mixture is declared. |
| Flammable Adhesives | Even if tax is 0%, Hazmat fees apply. Ensure UN Number and Packing Group are on the bill of lading. |
| Sample Shipments | If value < $800, use De Minimis (Section 321). No duty, but SDS is still required. |
| OEM Private Label | Provide authorization letter. Do not use another brand's trademark unless authorized. |
π V. Global Market Customs Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff | Certification Requirement | Notes |
|---|---|---|---|---|
| πΊπΈ USA | 3506.10.50.00 or 3506.91.50.00 |
0.0% | None (except SDS for Hazmat) | Duty-Free! Major advantage. |
| π¨π³ China | 3506.91 or 3506.10 |
6% - 7% | N/A | Import duty applies. |
| πͺπΊ EU | 3506.91 or 3506.10 |
0% - 4% | REACH Registration | Must comply with EU chemical laws. |
| π¬π§ UK | 3506.91 or 3506.10 |
0% - 4% | UK REACH | Post-Brexit regulations apply. |
| π―π΅ Japan | 3506.91 or 3506.10 |
0% - 3% | None | Generally low tariffs. |
π Conclusion:
- USA is the most favorable market for these adhesives due to the 0.0% total tariff for both retail and industrial polymer-based adhesives listed.
- Ensure SDS is perfect to avoid Hazmat delays, as the duty risk is zero.
π VI. Common Errors & Pitfall Guide (Blood-Lesson Advice)
β Error 1: Classifying bulk industrial epoxy as "Retail" (3506.10)
π Consequence: Customs may reject the code because a 20kg drum is not "retail packed."
π Solution: Use 3506.91.50.00 for bulk.
β Error 2: Missing "Polymer Base" Declaration
π Consequence: If Customs determines the adhesive is NOT polymer-based (e.g., it's a starch-based glue), they may reclassify it.
π Solution: Provide chemical analysis showing resin content (e.g., "Epoxy Resin, 60%").
β Error 3: Ignoring Hazmat Classification
π Consequence: Even with 0% duty, the shipment will be held by the carrier or Customs if not flagged as Flammable/Corrosive.
π Solution: Clearly mark "Class 3 Flammable Liquid" (if applicable) on the shipping docs.
β Correct Declaration Example:
"High Strength Two-Part Epoxy Adhesive, Put up for Retail Sale, 0.5kg Tube, Contains Epoxy Resin (HS 3506.10.50.00), SDS Attached."
π― VII. Conclusion: Professional Declaration, Zero Duty, Fast Clearance!
π― Remember the Mnemonic:
πΉ "Retail Tube is 10, Bulk Drum is 91, Both Are Zero, Check the Chemicals!"
πΉ "Packaging Size Matters, Polymer Base Wins, Zero Tax for USA, Hazmat Docs Begin!"
π Pro Tip:
If your adhesive is based on Rubber (not polymers 3901-3913), check if it still falls under 3506.91.50.00 or if it requires a different subheading. The provided data specifies "Polymers of 3901-3913 OR Rubber" under 3506.91.50.00, so Rubber-based adhesives are also likely 0.0%. Always confirm the base material.
π£ Immediate Action:
π Contact your customs broker with the SDS and Packaging Photos.
π Apply for Advance Ruling if shipping large volumes to lock in the 0.0% rate.
β Clear Customs Efficiently, Save 100% of Tariff Costs!
β¨ Professional Clearance Starts with Precise Classification!
πΌ Your Adhesive is Duty-FreeβDon't Let Documentation Errors Cost You Time!
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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.