methylphosphonic acid fluidization aid
CN โ US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3824920000 | 40.0% | CN | US | Official Doc |
| 3824999361 | 40.0% | CN | US | Official Doc |
| 291590 | 0.0% | CN | US | Official Doc |
| 382499 | 0.0% | CN | US | Official Doc |
| 2931440000 | 13.7% | CN | US | Official Doc |
| 2931490005 | 13.7% | CN | US | Official Doc |
| 2931440000 | 13.7% | CN | US | Official Doc |
| 2931490010 | 13.7% | CN | US | Official Doc |
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๐งช Methylphosphonic Acid Fluidization Aid (ๆๆบ-ๆ ๆบๅๅ็ฉ/ๅฉๅ)
๐ HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Entry Strategy
๐ 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).
โ ๏ธ Key Distinction Point:
- If the product is pure Methylphosphonic acid or a defined single compound โๅฝๅ ฅ 2931.44
- If it is a mixture/preparation containing MPA as a main component โๅฝๅ ฅ 3824.92 or 3824.99
๐ฆ 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 | โ Pure Organic-Phosphorus Compound |
2931.49.00.05 |
Other: O-Alkyl (โคC10, including cycloalkyl) N,N-dialkyl phosphoramidocyanidates | Specific derivatives, not MPA itself | โ Derivative |
2931.49.00.10 |
Other: 2-Amino-4-[hydroxy(methyl)phosphonoyl] butanoic acid (glufosinate) | Herbicides (Glufosinate), NOT simple MPA | โ Salt/Ester |
2915.90 |
Organic acids... not elsewhere specified | โ Incorrect for MPA (Methylphosphonic acid is specifically listed in 2931) | โ General Organic Acid |
3824.99 |
Other chemical products not elsewhere specified: Fluidization aids | โ ๏ธ Risk: If labeled generically as "Fluidization Aid" without chemical detail | โ Generic/Incorrect |
3824.92.00.00 |
Prepared binders... Polyglycol esters of methylphosphonic acid | Specific derivative mixture | โ Mixture/Derivative |
3824.99.93.61 |
Mixtures consisting mainly of chemicals containing a phosphorus atom bonded to one methyl... | โ Likely for Industrial Fluidization Aids | โ Mixture containing MPA |
๐ 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").
๐ฐ III. 2026 Latest Tariff Rate Details (Including Additional Taxes & Policy Surcharges)
โ Applicable Country: United States (US)
โ Origin: China (CN)
โ Effective Date: 2025/2026 (Current Trade Regime)
๐ฏ 1. 2931.44.00.00 โโ 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 ร 0% = $0 |
| De Minimis Exemption | N/A (Low value risk remains if undervalued) |
| Legal Basis Path | HTSUS:2931.44.00.00 โ No Section 301 footnotes for this specific subheading |
๐ 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.
๐ฏ 2. 3824.99.93.61 โโ 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 ร 30% |
| De Minimis Exemption | โ Not Applicable (Typically subject to full scrutiny) |
| Legal Basis Path | HTSUS:3824.99.93.61 โ USITC:3824.99.93.61 โ FOOTNOTE:301 |
๐ 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.
๐ฏ 3. 3824.92.00.00 โโ 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 ร 30% |
๐ Note: If the product is a specific ester derivative intended as a binder, it also faces the 30% rate.
๐ ๏ธ IV. Customs Clearance Practical Suggestions (Battle-Tested Pitfall Avoidance)
โ 1. Documentation Checklist (Non-negotiable)
| Document | Mandatory? | Description |
|---|---|---|
| โ Safety Data Sheet (SDS) | โ๏ธ | Must specify chemical identity (CAS No. for MPA is 630-38-2) and purity. |
| โ Certificate of Analysis (COA) | โ๏ธ | Proves if the substance is Pure (2931) or Mixture (3824). |
| โ Commercial Invoice | โ๏ธ | Must clearly state "Methylphosphonic Acid" OR "Preparation containing Methylphosphonic Acid". Do NOT just write "Chemical Fluidization Aid". |
| โ Product Formula/Composition | โ๏ธ | If claiming HS 2931, purity must be โฅ98% typically. If mixture, list % of MPA. |
| โ Filing Number (if applicable) | โ๏ธ | For Section 301 exclusions (if any apply to specific mixtures). |
โ 2. Declaration Strategy (Key Mnemonic)
๐ฅ "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) |
โ 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 itโs 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. |
๐ V. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff | Certification | Note |
|---|---|---|---|---|
| ๐บ๐ธ USA | 2931.44.00.00 |
0% | SDS + COA | Best for pure MPA. Avoid 3824 if possible. |
| ๐จ๐ณ China | 2931.44.00.00 |
0% | MSDS | No anti-dumping on this specific code. |
| ๐ช๐บ EU | 2931.44 |
6.5% | REACH Registration | MPA requires REACH registration for import >1 ton. |
| ๐ฎ๐ณ India | 2931.44 |
7.5% | BIS/Import License | Check for BCD (Basic Customs Duty) changes. |
๐ 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.
๐ VI. Common Errors & Pitfall Guide (Lessons from Blood)
โ Error 1: Declaring "Methylphosphonic Acid" as "General Chemical Fluidization Aid" (HS 3824.99)
๐ Consequence: You pay 30% tax instead of 0%. Loss of profit margin.
โ Error 2: Declaring "MPA Mixture" as "Pure Methylphosphonic Acid" (HS 2931.44)
๐ Consequence: Seizure or Penalty. Customs labs will test purity. If <98%, they reclassify to 3824 and charge back-duties + 10% penalty.
โ Error 3: Using HS 2915.90 (Organic Acids) for MPA
๐ Consequence: Wrong Classification. MPA is an organo-inorganic phosphorus compound, not a simple organic carboxylic acid. Customs will reject.
โ Correct Practice:
"Methylphosphonic Acid, 99% Purity, CAS 630-38-2, for Use as Fluidization Aid in Industrial Processes"
๐ฏ VII. Conclusion: Professional Declaration, Save Money, Save Time!
๐ฏ Remember the Mantra:
๐น "Pure MPA = 2931.44 = 0% Tax!"
๐น "Mixture = 3824 = 30% Tax!"
๐น "Functional Name is Illegal for Chemicals; Always Use Chemical Name!"
๐ 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.
๐ฃ Immediate Action:
๐ Contact your customs broker + Provide CAS Number (630-38-2) + Declare Chemical Name, not just "Aid".
๐ Let your MPA, pass through customs smoothly, legally, and tax-efficiently!
โจ Professional Customs Clearance Starts with Precise Classification!
๐ผ Every cent of duty is worth calculating precisely!
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) โ Broad category of goods (e.g., Chapter 84: Machinery and Mechanical Appliances)
- Heading (4 digits) โ More specific grouping within the chapter
- Subheading (6 digits) โ Internationally standardized breakdown, used by all WCO member countries
- National subdivisions (8-10 digits) โ 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 โ The standard duty rate applied to WTO members
- General rate โ Applied to countries without trade agreements
- Trade remedy duties โ 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.