1-Phenyl-3-pyrazolidinone (Phenidone) from Mexico
Phenidone is a pyrazolidinone derivative serving as a superadditive developing agent in black-and-white photographic film development. Its unfused pyrazolone ring structure places it under HTS 2933.19.30 as a photographic chemical. It accelerates silver halide reduction when combined with metol or hydroquinone.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Submit technical data sheets showing compatibility with standard photographic developers to confirm classification
• Verify purity levels (>98%) typical for photographic grade; impure grades risk reclassification as general organic chemicals