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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If when put up in retail hair waving preparations
Preparations for hairdressing classified in Chapter 33.
If considered inorganic sulfur acid derivative
Chapter 28 covers some sulfur-containing acids primarily inorganic in nature.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Include odorant/emetic documentation if added for safety per Chapter 29(g)
• Certify <0.1% heavy metals content for cosmetic/pharma grade imports
• Segregate 70% aqueous vs pure forms; different documentation requirements
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.
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.
Penicillamine
D-Penicillamine, a sulfhydryl-containing amino acid analog, classified under HTS 2930.90.4950 as organo-sulfur acid. Features thiol group with direct C-S bond; used primarily as chelating agent for Wilson's disease and rheumatoid arthritis treatment. Meets chemically defined compound requirements.