methylphosphonic acid fluidization aid
CN → US| HS编码 | 关税税率 | 原产国 | 目的国 | 文档 |
|---|---|---|---|---|
| 3824920000 | 40.0% | CN | US | 官方文档 |
| 3824999361 | 40.0% | CN | US | 官方文档 |
| 291590 | 0.0% | CN | US | 官方文档 |
| 382499 | 0.0% | CN | US | 官方文档 |
| 2931440000 | 13.7% | CN | US | 官方文档 |
| 2931490005 | 13.7% | CN | US | 官方文档 |
| 2931440000 | 13.7% | CN | US | 官方文档 |
| 2931490010 | 13.7% | CN | US | 官方文档 |
商品图片
AI分析
🧪 Methylphosphonic Acid Fluidization Aid (有机-无机化合物/助剂)
🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Entry Strategy
📌 I. Product Definition & Classification: Do You Really Understand "Methylphosphonic Acid"?
Methylphosphonic acid (MPA) is an organophosphorus compound primarily used as a fluidization aid in industrial processes to improve flow characteristics. In international trade, it is classified based on its chemical purity and formulation:
- Pure Chemical Substance: The specific chemical compound $CH_3P(O)(OH)_2$. Classified under Chapter 29 (Organic Chemicals).
- Prepared Mixtures/Preparations: MPA mixed with other carriers, stabilizers, or proprietary blends for industrial use. Classified under Chapter 38 (Miscellaneous Chemical Products).
⚠️ Key Distinction Point:
- If the product is pure Methylphosphonic acid or a defined single compound →归入 2931.44
- If it is a mixture/preparation containing MPA as a main component →归入 3824.92 or 3824.99
📦 II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)
| HS Code | Product Description | Application Scenario | Chemical Nature |
|---|---|---|---|
2931.44.00.00 |
Other organo-inorganic compounds: Non-halogenated organo-phosphorous derivatives: Methylphosphonic acid | Pure MPA standard, reagent grade, or high-purity industrial grade | ✅ Pure Organic-Phosphorus Compound |
2931.49.00.05 |
Other: O-Alkyl (≤C10, including cycloalkyl) N,N-dialkyl phosphoramidocyanidates | Specific derivatives, not MPA itself | ✅ Derivative |
2931.49.00.10 |
Other: 2-Amino-4-[hydroxy(methyl)phosphonoyl] butanoic acid (glufosinate) | Herbicides (Glufosinate), NOT simple MPA | ✅ Salt/Ester |
2915.90 |
Organic acids... not elsewhere specified | ❌ Incorrect for MPA (Methylphosphonic acid is specifically listed in 2931) | ❌ General Organic Acid |
3824.99 |
Other chemical products not elsewhere specified: Fluidization aids | ⚠️ Risk: If labeled generically as "Fluidization Aid" without chemical detail | ❌ Generic/Incorrect |
3824.92.00.00 |
Prepared binders... Polyglycol esters of methylphosphonic acid | Specific derivative mixture | ✅ Mixture/Derivative |
3824.99.93.61 |
Mixtures consisting mainly of chemicals containing a phosphorus atom bonded to one methyl... | ✅ Likely for Industrial Fluidization Aids | ✅ Mixture containing MPA |
🔍 Key Reminder:
- Pure MPA MUST be declared under 2931.44.00.00. Do NOT use generic "Fluidization Aid" codes (like 3824.99) if you are shipping pure chemical; customs may reject it for lack of chemical specificity. - If the product is a mixture (e.g., MPA dissolved in a carrier for ease of handling), it likely falls under 3824.99.93.61 ("Mixtures... mainly of chemicals containing a phosphorus atom... bonded to one methyl group").
💰 III. 2026 Latest Tariff Rate Details (Including Additional Taxes & Policy Surcharges)
✅ Applicable Country: United States (US)
✅ Origin: China (CN)
✅ Effective Date: 2025/2026 (Current Trade Regime)
🎯 1. 2931.44.00.00 —— Pure Methylphosphonic Acid
| Item | Content |
|---|---|
| Basic Tariff | 0.0% (ad valorem) |
| Section 301 Additional Tax | 0.0% |
| Total Tax Rate | 0.0% |
| Tax Calculation | CIF Value × 0% = $0 |
| De Minimis Exemption | N/A (Low value risk remains if undervalued) |
| Legal Basis Path | HTSUS:2931.44.00.00 → No Section 301 footnotes for this specific subheading |
📌 Explanation:
- Methylphosphonic acid is explicitly listed under 2931.44. - Crucially, it is currently exempt from the high Section 301 tariffs (unlike many other chemicals). - Total duty is 0%, making it highly competitive if purity is confirmed.
🎯 2. 3824.99.93.61 —— Methylphosphonic Acid Mixtures (Industrial Fluidization Aids)
| Item | Content |
|---|---|
| Basic Tariff | 5.0% |
| Section 301 Additional Tax | 25.0% |
| Total Tax Rate | 30.0% |
| Tax Calculation | CIF Value × 30% |
| De Minimis Exemption | ❌ Not Applicable (Typically subject to full scrutiny) |
| Legal Basis Path | HTSUS:3824.99.93.61 → USITC:3824.99.93.61 → FOOTNOTE:301 |
📌 Explanation:
- If your "Fluidization Aid" is a mixture or preparation (not pure MPA), it falls under 3824.99. - This category attracts the 25% Section 301 tariff. - Total 30% is significantly higher than pure MPA.
🎯 3. 3824.92.00.00 —— Polyglycol Esters of Methylphosphonic Acid
| Item | Content |
|---|---|
| Basic Tariff | 5.0% |
| Section 301 Additional Tax | 25.0% |
| Total Tax Rate | 30.0% |
| Tax Calculation | CIF Value × 30% |
📌 Note: If the product is a specific ester derivative intended as a binder, it also faces the 30% rate.
🛠️ IV. Customs Clearance Practical Suggestions (Battle-Tested Pitfall Avoidance)
✅ 1. Documentation Checklist (Non-negotiable)
| Document | Mandatory? | Description |
|---|---|---|
| ✅ Safety Data Sheet (SDS) | ✔️ | Must specify chemical identity (CAS No. for MPA is 630-38-2) and purity. |
| ✅ Certificate of Analysis (COA) | ✔️ | Proves if the substance is Pure (2931) or Mixture (3824). |
| ✅ Commercial Invoice | ✔️ | Must clearly state "Methylphosphonic Acid" OR "Preparation containing Methylphosphonic Acid". Do NOT just write "Chemical Fluidization Aid". |
| ✅ Product Formula/Composition | ✔️ | If claiming HS 2931, purity must be ≥98% typically. If mixture, list % of MPA. |
| ✅ Filing Number (if applicable) | ✔️ | For Section 301 exclusions (if any apply to specific mixtures). |
✅ 2. Declaration Strategy (Key Mnemonic)
🔥 "Pure MPA = 0% Tax; Mixture = 30% Tax. Name It Right!"
| Scenario | Correct HS Code | Wrong Declaration | Consequence |
|---|---|---|---|
| Pure Methylphosphonic Acid | 2931.44.00.00 |
"Fluidization Aid" (3824.99) | Overpaid Tax (You paid 30% instead of 0%) |
| MPA Mixture in Carrier | 3824.99.93.61 |
"Pure MPA" (2931.44) | Underpaid Tax + Penalty (Customs reclassifies, charges back-duties + fines) |
| Generic "Chemical Additive" | 2915.90 (Incorrect) |
Any | Rejected (2915.90 is for organic carboxylic acids, not phosphorus compounds) |
✅ 3. Special Circumstances Handling
| Situation | Handling Advice |
|---|---|
| Is it a "Fluidization Aid" or a Chemical? | If the primary function is flow improvement but the chemical identity is MPA, you must declare the chemical name. "Fluidization Aid" is a functional description, not a chemical classification. |
| Purity < 95% | If purity is low, customs may argue it’s a "mixture" (3824). Ensure COA supports high purity for 2931 classification. |
| Export to US? | Ensure the importer has filed the correct Section 301 exemption if claiming the 3824 route (though 2931 is better due to 0% tax). |
| Dangerous Goods? | MPA is corrosive. Ensure IMDG/IATA compliance for transport. Customs may inspect for safety hazards even if duty is low. |
🌍 V. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff | Certification | Note |
|---|---|---|---|---|
| 🇺🇸 USA | 2931.44.00.00 |
0% | SDS + COA | Best for pure MPA. Avoid 3824 if possible. |
| 🇨🇳 China | 2931.44.00.00 |
0% | MSDS | No anti-dumping on this specific code. |
| 🇪🇺 EU | 2931.44 |
6.5% | REACH Registration | MPA requires REACH registration for import >1 ton. |
| 🇮🇳 India | 2931.44 |
7.5% | BIS/Import License | Check for BCD (Basic Customs Duty) changes. |
📌 Conclusion:
- USA is the most favorable market for pure Methylphosphonic Acid due to 0% duty. - Mixtures are heavily taxed in the US (30%). - EU requires REACH compliance, which is a significant barrier for small shipments.
📌 VI. Common Errors & Pitfall Guide (Lessons from Blood)
❌ Error 1: Declaring "Methylphosphonic Acid" as "General Chemical Fluidization Aid" (HS 3824.99)
👉 Consequence: You pay 30% tax instead of 0%. Loss of profit margin.
❌ Error 2: Declaring "MPA Mixture" as "Pure Methylphosphonic Acid" (HS 2931.44)
👉 Consequence: Seizure or Penalty. Customs labs will test purity. If <98%, they reclassify to 3824 and charge back-duties + 10% penalty.
❌ Error 3: Using HS 2915.90 (Organic Acids) for MPA
👉 Consequence: Wrong Classification. MPA is an organo-inorganic phosphorus compound, not a simple organic carboxylic acid. Customs will reject.
✅ Correct Practice:
"Methylphosphonic Acid, 99% Purity, CAS 630-38-2, for Use as Fluidization Aid in Industrial Processes"
🎯 VII. Conclusion: Professional Declaration, Save Money, Save Time!
🎯 Remember the Mantra:
🔹 "Pure MPA = 2931.44 = 0% Tax!"
🔹 "Mixture = 3824 = 30% Tax!"
🔹 "Functional Name is Illegal for Chemicals; Always Use Chemical Name!"
📌 Tips:
- If you are shipping large volumes, consider negotiating pure MPA supply to leverage the 0% tariff.
- If you must ship formulated mixtures, ensure the COA accurately reflects the composition to avoid penalties.
- Pre-Ruling: For large shipments, apply for an Advance Ruling from US CBP to confirm the 2931.44 classification for your specific product.
📣 Immediate Action:
📞 Contact your customs broker + Provide CAS Number (630-38-2) + Declare Chemical Name, not just "Aid".
🚀 Let your MPA, pass through customs smoothly, legally, and tax-efficiently!
✨ Professional Customs Clearance Starts with Precise Classification!
💼 Every cent of duty is worth calculating precisely!
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