石材胶
CN → USAI Analysis
🧱 Stone Adhesives (Stone Glues)
🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Level Strategy
📌 I. Product Definition & Classification: Do You Really Understand "Stone Glue"?
Stone adhesives are specialized chemical products designed to bond natural stones (granite, marble, travertine) and artificial stone materials. In international trade, they are strictly categorized based on chemical base and packaging size.
1. Polymer-Based Adhesives (HS 3506.91.50.00) * Composition: Based on polymers of headings 3901 to 3913 (e.g., epoxy resins, polyurethanes, acrylics) or rubber. * Characteristics: High strength, chemical resistance, used for structural bonding or high-performance fixing.
2. Other Prepared Adhesives (HS 3506.99.00.00) * Composition: Glues not primarily based on the aforementioned polymers/rubber (e.g., organic adhesives based on other synthetic polymers, inorganic glues, or complex mixtures). * Characteristics: General-purpose stone fixing, setting mortars, or less common chemical bases.
⚠️ Key Distinction Point: * If the glue is explicitly based on polymers (3901-3913) OR rubber → Classify under 3506.91. * If the glue is not based on those specific polymers/rubber → Classify under 3506.99. * Packaging Constraint: The data provided applies to products suitable for retail sale as glues/adhesives, not exceeding a net weight of 1 kg. Larger bulk containers may have different classifications or tariff treatments.
📦 II. HS Code Classification Details (2026 Latest Tariff Authority Match)
| HS Code | Product Description | Applicable Scenario | Tax Rate (China to US) |
|---|---|---|---|
3506.91.50.00 |
Adhesives based on polymers of headings 3901 to 3913 or on rubber | Epoxy stone glues, PU stone adhesives, high-grade acrylic stone glues | 0.0% (Base: 0%, Add-on: 0%) |
3506.99.00.00 |
Other prepared adhesives (not elsewhere specified) | General stone setting mortars, inorganic stone glues, non-polymer/rubber based adhesives | 27.1% (Base: 2.1%, Add-on: 25.0%) |
🔍 Critical Reminder: * Epoxy and PU Glues are King: Most high-quality stone adhesives used in construction and restoration are epoxy or polyurethane-based. These fall under 3506.91.50.00, enjoying a 0% tariff. * Avoid the 27.1% Pitfall: If you misclassify a polymer-based glue as "Other Adhesives" (3506.99.00.00), you will pay 27.1%. Conversely, if you misclassify a general glue as polymer-based, you risk customs penalties for misdeclaration. * Retail Packaging: Ensure the net weight is clearly marked as ≤ 1 kg. Products over 1 kg may be subject to different HS codes (e.g., 3506.10 or 3506.91.50.00 might still apply, but verification is needed).
💰 III. 2026 Latest Tariff Rate Breakdown (Detailed Tax Terms)
✅ Applicable Country: United States (US) ✅ Origin: China (CN) ✅ Effective Time: Current as of 2026
🎯 1. 3506.91.50.00 —— Adhesives based on polymers of headings 3901 to 3913 or on rubber
| Item | Content |
|---|---|
| Base Tariff | 0.0% (ad valorem) |
| Section 301 Additional Tariff | 0.0% |
| IEEPA Additional Tariff | 0.0% |
| Total Tariff Rate | 0.0% |
| Tax Calculation | CIF Value × 0.0% = $0 |
| De Minimis Eligibility | ✅ Yes (If applicable for small packages) |
| Legal Basis Path | HTS:3506.91.50.00 |
📌 Explanation: * This is the sweet spot for stone adhesive exporters. * Polymers of headings 3901-3913 include polyethylene, polypropylene, PVC, PET, and crucially, epoxy resins and polyurethanes (if classified under 3909/3907/3908 depending on specific polymerization). * No additional Section 301 or IEEPA tariffs apply to this specific subheading, making it highly cost-effective.
🎯 2. 3506.99.00.00 —— Other prepared adhesives
| Item | Content |
|---|---|
| Base Tariff | 2.1% (ad valorem) |
| Section 301 Additional Tariff | +25.0% (from USITC Footnote 9903.88.01) |
| IEEPA Additional Tariff | 0.0% (Assumed not applicable to this specific "Other" category or already factored/zeroed in provided data) |
| Total Tariff Rate | 27.1% |
| Tax Calculation | CIF Value × 27.1% |
| De Minimis Eligibility | ❌ Check Specific Rules (Generally, 301 goods are excluded from de minimis) |
| Legal Basis Path | HTS:3506.99.00.00 → USITC:9903.88.01 |
📌 Note: * This category captures adhesives that do not fit the strict "polymer of 3901-3913" or "rubber" definition. * The 25% Section 301 tariff significantly increases the cost. * Base Rate: 2.1%. Add-on: 25.0%. Total: 27.1%.
🛠️ IV. Customs Clearance Practical Advice (Battle-Tested Pitfall Guide)
✅ 1. Essential Documentation Checklist
| Document | Mandatory | Description |
|---|---|---|
| ✅ Safety Data Sheet (SDS) | ✔️ | Crucial. Must clearly list chemical ingredients. Helps customs determine if it's "polymer-based" (3506.91) or "other" (3506.99). |
| ✅ Product Specification Sheet | ✔️ | Must state the chemical base (e.g., "Epoxy Resin," "Polyurethane," "Inorganic Silicate"). |
| ✅ Net Weight Declaration | ✔️ | Must clearly show ≤ 1 kg per unit to qualify for the retail sale classification in the provided data. |
| ✅ Commercial Invoice | ✔️ | Description must be precise: "Stone Adhesive, Epoxy-Based, 500g Net Weight." Avoid vague terms like "Glue." |
| ✅ Certificate of Origin | ✔️ | Proof of Chinese origin to apply the correct Section 301 rates. |
✅ 2. Declaration Strategy (Key Mantras)
🔥 “Chemical Base Determines Code, Weight Determines Eligibility!”
| Scenario | Correct Declaration | Incorrect Practice |
|---|---|---|
| Epoxy/Polyurethane Stone Glue | 3506.91.50.00 |
Misclassify as 3506.99.00.00 → Pay 27.1% unnecessarily |
| Inorganic/Gypsum-Based Stone Mortar | 3506.99.00.00 |
Misclassify as polymer-based → Risk fraud penalty & reclassification |
| Bulk Adhesive (>1 kg) | Verify New HS Code | Assume 3506.91.50.00 applies → May be invalid if over retail limit |
| Mistitled as "Stone Fixing Mortar" | Specify "Chemical Adhesive" | Use vague term → Customs may inspect thoroughly, delaying clearance |
✅ 3. Special Handling Tips
| Situation | Recommendation |
|---|---|
| Hybrid Adhesives | If the adhesive contains both polymer and other bases, declare based on the principal component or the essential character. SDS is key here. |
| Sample Shipments | For samples <1 kg, use 3506.91.50.00 (if epoxy/PU) to benefit from 0% tariff. Ensure it’s clearly labeled as "Sample." |
| Customs Examination | If customs questions the classification, provide a Chemical Analysis Report from a third-party lab to prove the polymer base (for 3506.91). |
🌍 V. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff Rate | Certification | Notes |
|---|---|---|---|---|
| 🇺🇸 USA | 3506.91.50.00 |
0.0% | SDS, TSCA Compliance | Best for Epoxy/PU glues. Avoid 3506.99 due to 27.1% tax. |
| 🇨🇳 China | 3506.91.50.00 |
Varies (Export) | CCC (if applicable) | No export tariff for these codes usually. |
| 🇪🇺 EU | 3506.91.50.00 |
Varies (Usually 0-2%) | CLP, REACH | EU has different 10-digit codes; verify locally. |
| 🇬🇧 UK | 3506.91.50.00 |
Varies | UKCA, CLP | Post-Brexit rules apply. |
| 🇦🇺 Australia | 3506.91.50.00 |
5% (MFN) | GEMS, AS/NZS | Check for chemical import controls. |
📌 Conclusion: * USA is the primary focus for the provided data. * Classifying as
3506.91.50.00is critical to avoid the 27.1% tax burden. * Ensure your product is genuinely based on polymers (3901-3913) or rubber. Epoxy and Polyurethane are your best friends here.
📌 VI. Common Mistakes & Pitfalls (Blood-Tested Lessons)
❌ Mistake 1: Calling it "Stone Mortar" and declaring as 3506.99.00.00 when it’s actually Epoxy-based.
👉 Consequence: You pay 27.1% instead of 0%. Loss of 27.1% margin.
❌ Mistake 2: Declaring it as 3506.91.50.00 when it’s Inorganic/Calcium-Based.
👉 Consequence: Customs reclassifies it, demands 27.1%, and may impose fines for misdeclaration.
❌ Mistake 3: Ignoring the 1 kg Net Weight limit. 👉 Consequence: If a box contains 2 kg, it may not qualify for the "retail sale ≤ 1 kg" subheading, leading to different HS codes and potential tax changes.
✅ Correct Practice:
"Stone Adhesive, 2-Component Epoxy Resin, Net Weight 500g, SDS Available, TSCA Compliant"
🎯 VII. Conclusion: Precision Classification Saves Money!
🎯 Remember the Mantra:
🔹 "Polymer/Rubber Base = 3506.91.50.00 = 0% Tax!" 🔹 "Other Base = 3506.99.00.00 = 27.1% Tax!" 🔹 "Check the SDS, Check the Weight, Check the Code!"
📌 Pro Tip: If you are exporting Epoxy or Polyurethane stone adhesives to the US, always classify under 3506.91.50.00. This is a 0% tariff item. For general/inorganic stone glues, be prepared for the 27.1% cost or explore duty drawback programs if eligible.
📣 Immediate Action:
📞 Contact your broker with the SDS. 🚀 Confirm the chemical base (Polymer vs. Other). 💼 Ensure net weight ≤ 1 kg for retail classification. Clearance success starts with accurate HS classification!
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.