NPP Stabilized with Antioxidant from China
N-Phenethyl-4-piperidone (NPP) with added BHT stabilizer to prevent oxidation during storage and transport, as permitted under Chapter 29 note 2(f). Retains chemical identity as heterocyclic nitrogen compound of 2933.37.00.00. Used in synthesis of opioid receptor compounds and research chemicals.
Duty Rate — China → United States
19%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Include stabilizer composition (<1% by weight) in SDS; must prove addition solely for preservation per note 2(f)
• Maintain cold chain logistics (2-8°C) as specified; temperature logs prevent degradation claims
• Cross-check stabilizer doesn't create 'specific use' formulation disqualifying Chapter 29 classification