3-Mercaptopropionic Acid from Mexico
3-Mercaptopropionic acid (HSCH₂CH₂COOH) is a straight-chain organo-sulfur carboxylic acid with sulfur directly linked to carbon, falling under HTS 2930.90.4950. Excluded from sulfonated derivatives per Chapter 29 note 6; qualifies as chemically defined compound. Applications include surface modification and polymer cross-linking.
Duty Rate — Mexico → United States
4.2%
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 FTIR spectra confirming absence of sulfonic/sulfonyl groups excluded from heading 2930
• Declare if anti-dusting agent added per Chapter 29(g); must not render product use-specific
• Verify batch purity >95% to maintain 'separate chemically defined' status