6-Nitrobenzimidazole from Canada
Used as a desensitizer and antifoggant in photographic emulsions, particularly for X-ray films requiring high contrast. This nitro-aromatic heterocycle controls silver halide sensitivity. Its specific photographic function qualifies it for HTS 2933.99.24.00.
Duty Rate — Canada → United States
100%
Rate breakdown
9903.04.6093.5%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Nitroaromatic requires explosive precursor screening; provide X-ray film end-use verification; ensure proper sequencing in Chapter 29 classification hierarchy