Photosensitive Emulsion Sensitizer
CN β US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3707100090 | 38.0% | CN | US | Official Doc |
| 3707100005 | 38.0% | CN | US | Official Doc |
| 3506911000 | 35.0% | CN | US | Official Doc |
| 3506915000 | 37.1% | CN | US | Official Doc |
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π§ͺ Photosensitive Emulsion Sensitizer (Chemical Preparations)
π HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Breakdown | Professional Logistics Strategy
π I. Product Definition & Classification: What is a "Photosensitive Emulsion Sensitizer"?
Photosensitive emulsion sensitizers are specialized chemical preparations used primarily in foundry mold/core manufacturing, photographic industries, and industrial coating processes. They act as accelerators or activators for resin binders or light-sensitive layers.
In international trade, these products fall under Chapter 38: Miscellaneous Chemical Products. Specifically, they are classified as "Prepared binders for foundry molds or cores" or "Chemical products and preparations... not elsewhere specified."
β οΈ Key Distinction Point:
- If the product is a mixture containing β₯5% aromatic/modifying aromatic substances (e.g., sulfonium salts), it triggers specific subheadings under 3824.99.25 or 3824.99.26.
- The critical factor is the chemical composition (aromatic content) and specific ingredients (e.g., sulfonium chlorides, isocyanate polymers, fluoro-indenes).
π¦ II. HS Code Classification Details (2026 Latest Tariff Authority Mapping)
Based on the provided data, there are two primary HS codes depending on the specific chemical formulation.
| HS Code | Product Description (Summary) | Key Chemical Composition | Primary Application |
|---|---|---|---|
3824.99.25.00 |
Prepared binders for foundry molds/cores; Chemical preparations; Mixtures with β₯5% aromatic substances | Aqueous mixtures of: - Triphenyl sulfonium chloride - Diphenyl (4-phenylthio)phenyl sulfonium chloride - (Thiodi-4,1-phenylene)bis(diphenyl sulfonium) dichloride |
Foundry sand binding, UV-curing molds |
3824.99.26.00 |
Prepared binders for foundry molds/cores; Chemical preparations; Mixtures with β₯5% aromatic substances | Complex mixtures including: - Benzene, 2,4-diisocyanate-1,3,5-tris(1-methylethyl) homopolymer - 5-Fluoro-2-methyl-1-[[4-(methylsulfinyl)-phenyl]methylene]-1H-indene - Mixtures of dimethyl phthalate, t-butanol, HβOβ, sodium salicylate - Derivatives of N-[4-(2-hydroxy-3-phenoxypropoxy)phenyl]-acetamide |
Advanced industrial coatings, specialized resins, high-performance binders |
π Critical Note:
- Both codes fall under 3824.99.25/26 because they contain β₯5% by weight of aromatic or modified aromatic substances.
- Misclassification as generic "chemical mixtures" (e.g., 3824.90) can lead to incorrect tax rates and customs delays.
π° III. 2026 Latest Tariff Rate Breakdown (Including Duties & Surcharges)
β Applicable Country: United States (US)
β Country of Origin: China (CN)
β Effective Date: 2025/2026 (Subject to Trade Policies)
π― 1. HS Code 3824.99.25.00 ββ Aqueous Sulfonium Salt Mixtures
| Item | Content |
|---|---|
| Base Tariff Rate | 0.0% |
| Additional Tariffs (Section 301/Trade War) | 0.0% |
| Total Tax Rate | 0.0% |
| Tax Detail | Base Tariff: 0.0%, Additional Tariff: 0.0% |
| Legal Basis | Generalized System of Preferences (GSP) may apply, but currently 0% under standard MFN for this specific subheading. |
π Explanation:
- This specific aqueous mixture of sulfonium salts enjoys a 0% tariff.
- It is exempt from the typical 25% Section 301 tariffs often applied to chemical products from China.
- Reason: This specific subheading (3824.99.25.00) is carved out or historically set at 0% for these specialized foundry binders.
π― 2. HS Code 3824.99.26.00 ββ Complex Aromatic/Isocyanate Mixtures
| Item | Content |
|---|---|
| Base Tariff Rate | 0.0% |
| Additional Tariffs (Section 301/Trade War) | +25.0% |
| Total Tax Rate | 25.0% |
| Tax Detail | Base Tariff: 0.0%, Additional Tariff: 25.0% |
| Legal Basis | USITC Footnotes for Section 301 Tariffs on Chinese Chemicals. |
π Explanation:
- Although the base tariff is 0%, this product is subject to the 25% additional tariff under Section 301.
- Reason: The chemical composition (isocyanates, fluoro-indenes, phthalates) falls under the targeted list of chemicals subject to trade remedies.
- Total Cost Impact: Importers must pay 25% of the CIF value as additional duty.
π οΈ IV. Customs Clearance Practical Advice (Actionable Guide)
β 1. Documentation Checklist (Mandatory)
| Document | Required? | Notes |
|---|---|---|
| Safety Data Sheet (SDS) | β Yes | Must clearly list chemical components (e.g., "Triphenyl sulfonium chloride") to prove HS Code accuracy. |
| Certificate of Origin (CO) | β Yes | Required to verify China origin and apply/additional tariffs correctly. |
| Commercial Invoice | β Yes | Must describe goods as "Photosensitive Emulsion Sensitizer" or "Prepared Binder for Foundry Molds," not just "Chemical." |
| Packing List | β Yes | Detail net/gross weight and packaging type. |
| Import License/Permit | β οΈ Check | Some chemicals may require EPA or DOT approval if classified as hazardous. |
β 2. Declaration Strategy (Key Tips)
π₯ Mnemonic:
"Aqueous Sulfonium = 0% | Isocyanate Mix = 25% | Be Precise!"
| Scenario | Correct HS Code | Tax Rate | Risk if Misdeclared |
|---|---|---|---|
| Product contains aqueous triphenyl sulfonium chloride | 3824.99.25.00 |
0% | High risk of overpayment or audit if declared as 3824.99.26.00 (25%). |
| Product contains isocyanate polymers or fluoro-indenes | 3824.99.26.00 |
25% | Low risk, but underpayment if declared as 3824.99.25.00. |
| Generic "Chemical Mixture" | 3824.90.99.90 (Hypothetical) |
Varies | HIGH RISK: Customs will reclassify based on SDS, potentially imposing penalties + back taxes. |
π Critical Warning:
- Do not use vague terms like "Glue" or "Adhesive."
- Use the exact chemical names from the HS description in the invoice if possible, or reference the SDS section for "Product Identification."
β 3. Special Cases
| Case | Handling Advice |
|---|---|
| Mixed Shipments | If a single shipment contains both types of sensitizers, declare separately with different HS Codes to avoid blanket 25% taxation. |
| Sample Shipments | Even small samples are subject to the same HS Code rules. 0% or 25% still applies. Do not claim "de minimis" exemption if value exceeds threshold or if prohibited. |
| Re-export | If used in manufacturing and re-exported, consider Foreign Trade Zone (FTZ) benefits to defer/tax on duties. |
π V. Global Market Comparison (2026)
| Region | Recommended HS Code | Est. Tariff (China Origin) | Notes |
|---|---|---|---|
| πΊπΈ USA | 3824.99.25.00 / 3824.99.26.00 |
0% / 25% | Strict Section 301 enforcement. |
| π¨π³ China (Import) | 3824.99.90.90 | ~6-8% | Lower than US, but varies by local policy. |
| πͺπΊ EU | 3824.99.99 | ~6.5% | No Section 301 equivalent, but standard MFN applies. |
| π¬π§ UK | 3824.99.99 | ~6.5% | Post-Brexit tariffs similar to EU. |
π Conclusion:
- The US is the most complex market due to the 0% vs. 25% dichotomy based on chemical specificity.
- EU/China/UK have more uniform rates but lack the nuanced subheadings found in the US HTS.
π VI. Common Mistakes & Pitfalls (Lessons Learned)
β Mistake 1: Declaring "Sulfonium Salt Mixture" as generic "Chemical" (3824.90)
π Consequence: Customs may reclassify to 3824.99.25.00 (0%) or 3824.99.26.00 (25%) based on SDS. If undervalued or misdescribed, penalties + interest apply.
β Mistake 2: Assuming all "Foundry Binders" are 0%
π Consequence: Only the specific aqueous sulfonium mixtures are 0%. Other binders (isocyanate-based) are 25%. Read the ingredient list!
β Mistake 3: Ignoring the "5% Aromatic" Threshold
π Consequence: If the product contains <5% aromatic substances, it may fall under a different, potentially higher or lower, general heading. Chemical analysis may be required.
β Best Practice:
Always provide the SDS with the initial filing. If the chemical composition matches
3824.99.25.00exactly, claim 0%. If it matches3824.99.26.00, budget for 25%.
π― VII. Final Recommendations
- Verify Chemical Composition: Before shipping, confirm with your lab which exact compounds are present.
- Consult a Customs Broker: Given the 0% vs. 25% split, professional classification is critical.
- Document Everything: Keep SDS, invoices, and chemical analysis reports for 5 years post-import.
π£ Immediate Action:
π Contact your freight forwarder with the exact chemical list.
π Prepare SDS highlighting "Triphenyl Sulfonium" (0%) or "Isocyanate Polymers" (25%).
π Ensure compliance to avoid costly delays at US Customs.
β¨ Precision in Chemistry, Precision in Customs!
πΌ Save money by declaring correctly!
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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.