NPP Stabilized with Antioxidant
N-Phenethyl-4-piperidone (NPP) with added BHT stabilizer to prevent oxidation during storage and transport. The stabilizer is permitted under Chapter 29 Note 1(f) as necessary for preservation, and the product remains a separate chemically defined compound, classifiable under tariff item 2933.37.00.
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:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the stabilizer renders the product suitable for a specific use
Products with additives that make them particularly suitable for a specific use may be classified under other nitrogen heterocyclic compounds.
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
• Document the stabilizer's purpose and quantity to justify classification under 2933.37.00
• Ensure the stabilizer does not exceed levels that would affect the product's character
• Keep records of the stabilizer's necessity for transport or storage
Related Products under Tariff item 2933.37.00
N-Phenethyl-4-piperidone Ethanol Solution (10%)
A 10% solution of N-Phenethyl-4-piperidone (NPP) in ethanol, where the ethanol serves as a necessary transport solvent. Under Chapter 29 Note 1(e), solutions in other solvents are classified with the compound if the solvent is required for safety or transport and does not make the product suitable for a specific use. Thus, it falls under tariff item 2933.37.00.
N-Phenethyl-4-piperidone (NPP) Pure Chemical
N-Phenethyl-4-piperidone (NPP) is a heterocyclic organic compound featuring an unfused piperidone ring (a hydrogenated pyridine derivative) with a phenethyl substituent at the nitrogen atom. It is a separate chemically defined compound, which qualifies it for classification under Chapter 29, specifically tariff item 2933.37.00.
N-Phenethyl-4-piperidone with Anti-Dusting Agent
N-Phenethyl-4-piperidone (NPP) powder treated with a silica anti-dusting agent (less than 0.5%) for safe handling and identification. The addition of the anti-dusting agent is permitted under Chapter 29 Note 1(g) as it does not render the product particularly suitable for a specific use, so it retains classification as a separate chemically defined compound under tariff item 2933.37.00.
NPP Custom Synthesis Intermediate
Custom-produced N-Phenethyl-4-piperidone (NPP) for specific pharmaceutical campaigns, verified by HPLC to meet specifications. It is a separate chemically defined compound with an unfused piperidone ring, qualifying under tariff item 2933.37.00 regardless of its custom production nature.
NPP Laboratory Research Grade (>99%)
High-purity N-Phenethyl-4-piperidone (NPP) (>99%) packaged for laboratory research use. Classification under tariff item 2933.37.00 is based on the chemical identity of the compound, not its end use. It is a separate chemically defined heterocyclic compound with a piperidone ring.