Spermine Tetrahydrochloride from Mexico
Spermine tetrahydrochloride, a tetraamine salt, classified under HTS 2921.29.00.55 as acyclic polyamine derivative salt for biochemical research.
Duty Rate — Mexico → 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
• Verify Sigma-Aldrich/USP reference standards matching imported specification
• Document research institution end-user to avoid pharmaceutical classification
• Maintain cold chain documentation (2-8°C storage required)