Tromethamine (Tris(hydroxymethyl)aminomethane) from Canada
Tromethamine, or Tris base, is an amino-triol used as a biological buffer and pharmaceutical excipient, falling under HTS 2922.19.96 for oxygen-function amino-alcohols. It is a separate chemically defined compound as specified in Chapter 29 notes.
Duty Rate — Canada → United States
6.5%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Provide USP/EP certificates for pharmaceutical grade to facilitate FDA customs clearance
• Declare as 'biological buffer' but emphasize pure compound status to maintain Chapter 29 classification
• Ensure stabilizer content <1% to avoid reclassification per chapter preservation notes