Mercaptopropionic Acid Thiolactic Acid
Thiolactic acid (2-mercaptopropanoic acid) is an alpha-mercapto carboxylic acid classified under HTS 2930.90.4950. Direct sulfur-carbon bonding with both thiol and carboxylic functions; used in cosmetic depilatories and metal finishing.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If shampoo/depilatory preparations
Cosmetic preparations classified by end-use in Chapter 33.
If classified as saturated acyclic carboxylic acid
Principal chain classification if sulfur considered substituent only.
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Import Tips & Compliance
• Chiral specification (DL-, D-, or L-form) required for documentation
• Odor control agent permitted per Chapter 29(g) safety provisions
• Skin sensitization warnings mandatory on SDS
Related Products under HTS 2930.90.49.50
Methanethiosulfonic Acid S-Methyl Ester
Methanethiosulfonic acid S-methyl ester is an organo-sulfur compound featuring a thioester functional group where sulfur is directly linked to carbon. Classified under HTS 2930.90.4950 as 'other' organo-sulfur acids, it falls within Chapter 29's scope for separate chemically defined organic compounds containing sulfur directly bonded to carbon. Primarily used as a reagent in organic synthesis and protein modification research.
Ethyl 2-Mercaptoacetate
Ethyl 2-mercaptoacetate (HSCH₂CO₂Et) is a mercaptoacetic acid ester classified as an organo-sulfur acid derivative under HTS 2930.90.4950. The thiol (-SH) group provides sulfur directly linked to carbon, fitting Chapter 29's definition of organo-sulfur compounds excluding sulfonated types. Used in polymer synthesis and as pharmaceutical intermediate.
2-Mercaptopropionic Acid
2-Mercaptopropionic acid (CH₃CH(SH)CH₂COOH) contains both carboxylic acid and thiol functions with sulfur directly bonded to carbon, classified under HTS 2930.90.4950 as other organo-sulfur acids. Meets Chapter 29 criteria for chemically defined compounds; the sulfur-carbon linkage distinguishes it from Chapter 28 inorganic acids. Used in chelating agents and metal extraction.
3-Mercaptopropionic Acid
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.
Thioglycolic Acid (Mercaptoacetic Acid)
Thioglycolic acid (HSCH₂COOH), also known as mercaptoacetic acid, is the prototypical organo-sulfur carboxylic acid classified under HTS 2930.90.4950. Features direct sulfur-carbon bonding meeting heading 2930 criteria; excluded from Chapter 32 coloring matters. Widely used in hair permanents, metal polishing, and chemical synthesis.
Cysteine Hydrochloride Monohydrate
L-Cysteine hydrochloride monohydrate is the hydrochloride salt of an organo-sulfur amino acid classified under HTS 2930.90.4950 per Chapter 29 note 4(C)(1). The organic acid-function compound determines classification; sulfur directly linked to carbon. Used as dough conditioner and nutritional supplement.