3-Mercaptopropionic Acid
3-Mercaptopropionic acid serves as a cross-linking agent in polymer synthesis and corrosion inhibitor. It qualifies for HTS 2930.90.49 as an organo-sulfur carboxylic acid, meeting the direct sulfur-carbon linkage requirement of heading 2930.
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More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing sulfide (-S-) function rather than thiol (-SH)
Different organo-sulfur functional groups have specific subheadings within 2930.
If classified primarily by polycarboxylic acid function
Oxygen-function acids take precedence if multi-functional per note 3(A).
If diluted solution >25% concentration for safety transport
Chapter notes allow aqueous solutions under 29 only if normal for transport.
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Import Tips & Compliance
• Include TSCA certification for US environmental compliance; failure common cause of entry refusal
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• Document bulk vs packaged form—retail packs may shift to 3824.99
Related Products under HTS 2930.90.49
Thioglycolic Acid
Thioglycolic acid (mercaptoacetic acid) is a colorless liquid organic sulfur compound used in hair perming solutions, metal cleaning, and polymer production. It falls under HTS 2930.90.49 as an organo-sulfur acid with sulfur directly linked to carbon, classified as 'other' acids not specifically enumerated elsewhere in heading 2930.
Thiosalicylic Acid
Thiosalicylic acid (2-mercaptobenzoic acid) serves in pharmaceutical synthesis and rubber vulcanization. Classified in HTS 2930.90.49 as other organo-sulfur acids per direct S-C linkage requirement.
2-Mercaptopropionic Acid
2-Mercaptopropionic acid is an alpha-thiol carboxylic acid used in pharmaceutical intermediates and metal chelation applications. Classified under HTS 2930.90.49 as an other organo-sulfur acid with the characteristic S-C bond structure defined in heading 2930.
Mercaptosuccinic Acid
Mercaptosuccinic acid (thiomalic acid) functions as a chelating agent in metal recovery processes and biochemical research. HTS 2930.90.49 covers this as an other organo-sulfur acid per the chapter's definition of compounds with S directly bound to C.
2-Mercaptobenzoic Acid
2-Mercaptobenzoic acid is used in dye synthesis and as a reagent in analytical chemistry. It falls under HTS 2930.90.49 as an aromatic organo-sulfur acid, consistent with heading 2930's scope for non-sulfonated S-C compounds.