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🛡️ Hindered Amine Light Stabilizers (HALS)
🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional-Level Clearance Strategy
📌 Part I: Product Definition & Classification: Do You Really Understand "HALS"?
Hindered Amine Light Stabilizers (HALS) are high-performance additives used primarily in plastics, coatings, and rubbers to prevent degradation caused by ultraviolet (UV) light. They do not absorb UV light (like UV absorbers) but instead scavenge free radicals generated by UV exposure, significantly extending the lifespan of polymer products.
In international trade, HALS are broadly classified based on their chemical structure and state, but they generally fall under a single primary HS Code category. However, nuances exist depending on whether they are specific chemical entities or mixtures.
⚠️ Key Distinction Point:
- If it is a pure chemical compound (defined structure) → Classified under 2933.99.80.00 (Other heterocyclic compounds with nitrogen heteroatoms only).
- If it is a mixture or formulation containing HALS and other substances → May be classified under 3824.99.90.00 (Prepared binding agents for metal foundry molds; chemical products and preparations not elsewhere specified or included).
- Critical Rule: Pure HALS chemicals are strictly 2933; HALS admixtures or commercial formulations are often 3824.
📦 Part II: HS Code Classification Details (2026 Latest Tariff Authority对照)
| HS Code | Product Description | Application Scenario | Purity/State |
|---|---|---|---|
2933.99.80.00 |
Other heterocyclic compounds containing nitrogen heteroatoms only (including HALS like Tinuvin 770, Chimassorb 944) | Pure chemical raw materials, intermediates | ✅ Pure Chemical |
3824.99.90.00 |
Other prepared binding agents, plasticizers, etc. (HALS-containing mixtures, masterbatches with high HALS content but not solely HALS) | Plastic masterbatches, coatings with pre-mixed stabilizers | ✅ Mixture/Formulation |
3901–3914 |
Plastics in primary forms (e.g., PE, PP, PVC resins containing HALS as an additive during manufacturing) | Pre-stabilized plastic pellets/resins | ❌ N/A (Goods themselves, not additive) |
🔍 Key Reminder:
- Pure HALS (e.g., Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate) MUST be classified under 2933.99.80.00.
- If the product is a masterbatch (e.g., 50% HALS + 50% carrier resin), it may be classified under 3824 or even 3901–3914 depending on the principal function and local customs interpretation.
- Do not misdeclare pure HALS as "Plastic Additives" under 3824 if it is a pure chemical, as this may lead to misclassification penalties.
💰 Part III: 2026 Latest Tariff Rate Detailed Explanation (Including Additional Taxes)
✅ Applicable Country: United States (US)
✅ Country of Origin: China (CN)
✅ Effective Date: From November 10, 2025 (and subsequent imports)
🎯 1. 2933.99.80.00 —— Pure Hindered Amine Light Stabilizers (Heterocyclic Compounds)
| Item | Content |
|---|---|
| Base Rate | 5.3% (ad valorem) |
| USITC Additional Duty | +25% (from USITC Footnote 9903.88.01 under Section 301) |
| IEEPA Additional Duty | +10% (Targeting China/HK products, effective from November 10, 2025) |
| Total Tariff Rate | 40.3% |
| Tax Calculation | CIF Value × 40.3% |
| De Minimis Exemption Eligibility | ❌ Not Eligible (deny_de_minimis) |
| Legal Basis Path | IEEPA:9903.01.25 → IEEPA:9903.01.24 → USITC:2933.99.80.00 → FOOTNOTE:9903.88.01 |
📌 Explanation:
- The "25% USITC additional duty" stems from Section 301 of the U.S. Trade Act targeting Chinese high-tech and chemical products.
- The "10% IEEPA duty" is the additional levy under the International Emergency Economic Powers Act.
- Total 40.3% is a high tariff burden. Cost planning must include this significant increase.
🎯 2. 3824.99.90.00 —— HALS Mixtures / Masterbatches
| Item | Content |
|---|---|
| Base Rate | 5.3% |
| USITC Additional Duty | +25% (if classified as chemical preparations under Section 301 lists) |
| IEEPA Additional Duty | +10% |
| Total Tariff Rate | 40.3% (Generally consistent with chemical imports) |
| Tax Calculation | CIF Value × 40.3% |
| De Minimis Exemption Eligibility | ❌ Not Eligible |
| Legal Basis Path | Similar to above, depending on specific footnote application |
📌 Note:
- If customs determines the mixture is primarily a "prepared chemical" (Chapter 38), the same high tariff rates apply.
- If classified under plastics (Chapter 39) due to high resin content, tariffs may be lower (often 0–3% base), but this requires strong justification of the "principal character" of the plastic resin, not the stabilizer.
🛠️ Part IV: Customs Clearance Practical Advice (Battle-Tested Pitfall Avoidance Guide)
✅ 1. Required Documentation Checklist (No Exceptions)
| Document | Mandatory? | Description |
|---|---|---|
| ✅ Product Specification Sheet | ✔️ | Must include chemical name, CAS number, purity, molecular structure. |
| ✅ CAS Number | ✔️ | Critical for customs verification (e.g., CAS 122982-08-9 for Tinuvin 770). |
| ✅ Technical Data Sheet (TDS) | ✔️ | Shows application, physical state, and chemical composition. |
| ✅ Certificate of Analysis (COA) | ✔️ | Proves purity and batch consistency. |
| ✅ Commercial Invoice | ✔️ | Clearly state "Hindered Amine Light Stabilizer (HALS), CAS No. XXXXX". |
| ✅ Origin Certificate (CO) | ✔️ | To prove origin; if not China, may qualify for exemptions. |
| ✅ Packing List | ✔️ | Detail weight, packaging type (drums, bags). |
✅ 2. Declaration Techniques (Key Mantra)
🔥 "Pure Chemical = 2933, Mixture = 3824, CAS Number is King!"
| Scenario | Correct Declaration | Wrong Practice |
|---|---|---|
| Pure HALS Chemical | 2933.99.80.00 + CAS Number |
Declaring as "Plastic Additive" (3824) → May trigger audit |
| HALS Masterbatch (High Resin) | 3901–3914 (if resin is principal character) |
Declaring as pure chemical → Over-tariff or misclassification |
| HALS in Liquid Formulation | 3824.99.90.00 |
Declaring as pure solid chemical → Incorrect state description |
| Pre-stabilized Plastic Pellets | 3901–3914 |
Declaring as HALS additive → Goods are plastic, not additive |
✅ 3. Special Situation Handling
| Situation | Handling Advice |
|---|---|
| Customs Audit on CAS Number | Provide MSDS and TDS simultaneously. Ensure CAS number matches the chemical name exactly. |
| HALS + UV Absorber Mixture | If it's a mixture of two pure chemicals, customs may still classify under 2933 if it's a single-defined entity, or 3824 if it's a blend. Better to declare as 3824 if it's a commercial blend to avoid complexity. |
| OEM Branded HALS | Provide customer contract and formulation proof. Avoid declaring as generic if branded, but HS code remains the same. |
| Sample Shipments | Even for samples, apply for Advance Ruling if value is high. De minimis exemption ($800) does NOT apply due to IEEPA/Section 301 restrictions. |
🌍 Part V: Global Market Clearance Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff (China Origin) | Certification Requirements | Notes |
|---|---|---|---|---|
| 🇺🇸 United States | 2933.99.80.00 |
40.3% (45% if pure under specific footnotes) | None specific, but MSDS required | High tariff burden due to Section 301 + IEEPA |
| 🇨🇳 China | 2933.99.80.00 |
5.3% | None | No additional surcharges |
| 🇪🇺 European Union | 2933.99.90 |
6.5% (Base) | REACH Registration | No anti-dumping/counter-vailing duties currently |
| 🇮🇳 India | 2933.99.90 |
7.5% + IGST | BIS Certification may be required for some plastics | Check BIS norms for final product |
| 🇯🇵 Japan | 2933.99.90 |
5.5% | FSCSA Compliance (if food contact) | Generally low tariffs |
📌 Conclusion:
- The United States is the most challenging market due to the cumulative effect of Section 301 (25%) and IEEPA (10%) tariffs, totaling 35–40.3%.
- EU, Japan, and India offer relatively lower tariff burdens, but REACH (EU) and BIS (India) compliance are critical.
- Sourcing Alternative: Consider sourcing HALS from non-China origins (e.g., Switzerland, USA, Japan) to mitigate U.S. tariffs, though prices may be higher.
📌 Part VI: Common Errors & Pitfall Avoidance Guide (Lessons Learned the Hard Way)
❌ Error 1: Declaring "Plastic Stabilizer" without specifying "HALS" or CAS number
👉 Consequence: Customs may reject the declaration, request additional documentation, or classify under a wrong code with higher penalties.
❌ Error 2: Misclassifying Pure HALS as "Plastic Resin" (3901)
👉 Consequence: Tariff evasion detection → Back taxes + Fines + Possible seizure.
❌ Error 3: Ignoring IEEPA 10% for China-origin goods
👉 Consequence: Underpayment of duties → Audit risk + Late fees.
❌ Error 4: Using "Sample" declaration for commercial quantities
👉 Consequence: De minimis exemption denied → 100% duty liability + Legal risk.
✅ Correct Practice:
"Hindered Amine Light Stabilizer (HALS), CAS No. 122982-08-9, Pure Chemical, for Industrial Use, China Origin"
🎯 Part VII: Conclusion: Professional Declaration, Time-Saving, Cost-Efficiency!
🎯 Remember the Mantra:
🔹 "Pure = 2933, Mixture = 3824, CAS Number is Key!"
🔹 "U.S. Tariff = 40%+, Plan Ahead or Re-source!"
🔹 "De Minimis Doesn't Apply, Always Declare Fully!"
📌 Pro Tip:
If your HALS products are originating from Switzerland, Germany, Japan, or the USA, you may exempt IEEPA tariffs, reducing total tariff to 25% (USITC only) or even 0% (if under USMCA or FTAs).
Recommend applying for a Pre-Ruling (Advance Ruling) with U.S. CBP to confirm the correct HS Code and tariff application before shipment.
📣 Immediate Action:
📞 Contact a professional customs broker + Provide CAS Number & MSDS + Apply for HS Code Pre-Ruling
🚀 Let your HALS products clear customs smoothly, avoid costly delays, and maximize profit margins!
✨ Professional Customs Clearance Starts with Accurate Classification!
💼 Every cent of your cost deserves precise calculation!
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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) — 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.