High Purity Methylphosphonic Acid for Synthesis
High purity methylphosphonic acid (99.9%) is a separate chemically defined organo-inorganic compound containing a phosphorus atom directly linked to carbon. It is classified under tariff item 2931.44.00 as a non-halogenated organo-phosphorous derivative, specifically methylphosphonic acid. This product is intended for laboratory and pharmaceutical synthesis, meeting the criteria of Chapter 29 Note 1(a).
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the product is accompanied by a certificate of analysis confirming purity and chemical identity to support classification under 2931.44.00
• Verify if the product requires an import permit under the Chemical Weapons Convention regulations, as methylphosphonic acid is a Schedule 2 chemical
• Declare the correct CAS number (993-13-0) on customs documentation to avoid delays
Related Products under Tariff item 2931.44.00
Methylphosphonic Acid (99% Purity)
Methylphosphonic acid (99% purity) is a separate chemically defined organo-inorganic compound with the formula CH3P(O)(OH)2, containing phosphorus directly linked to carbon. It falls under tariff item 2931.44.00 as a non-halogenated organo-phosphorous derivative. The product is used in various chemical syntheses and meets Chapter 29 Note 1(a) requirements.
Methylphosphonic Acid Aqueous Solution (50%)
A 50% aqueous solution of methylphosphonic acid is classifiable under tariff item 2931.44.00 per Chapter 29 Note 1(d), which allows products of this heading dissolved in water. The solution is used in metal surface treatment and as a catalyst intermediate. The water does not render the product particularly suitable for a specific use, maintaining classification under this item.
Stabilized Methylphosphonic Acid Flakes
Stabilized methylphosphonic acid flakes contain minimal stabilizers added for safe transport, which is permitted under Chapter 29 Note 1(f). The product is used in polymer flame retardant production and falls under tariff item 2931.44.00 as a non-halogenated organo-phosphorous derivative. The stabilizer does not alter the product's general use.
Technical Grade Methylphosphonic Acid
Technical grade methylphosphonic acid is a white crystalline powder used in industrial chemical processes. It is a separate chemically defined organo-inorganic compound and falls under tariff item 2931.44.00 as a non-halogenated organo-phosphorous derivative. The technical grade may contain impurities, which are allowed under Chapter 29 Note 1(a).