Tartaric Acid Esters from Canada
Mono- or diesters of tartaric acid with C1-C6 alcohols, retaining free carboxyl and hydroxyl functions. HTS 2918.99.5000 as carboxylic acids with additional oxygen function. Used in chiral synthesis and food antioxidants.
Duty Rate — Canada → United States
14%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Chiral specification (L/D/±) mandatory for invoice; affects pharma intermediate valuation
• GRAS status requires FDA affirmation documentation for food use
• Mixtures of tartaric esters >2 isomers may classify under Chapter 29 note (b)