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Thiolactic acid

CAS Number
79-42-5
EC Number
201-206-5
Chemical Formula
C3H6O2S
Molecular Weight
106.15 g/mol

Description

Thiolactic acid (CAS 79-42-5 ), also known as alpha-mercaptopropionic acid, is a sulfur-containing organic acid used across pharmaceutical synthesis, personal care manufacturing, and industrial processing. Its thiol and carboxylic acid groups make it a reactive intermediate for building complex molecules and a functional agent in formulation chemistry. In pharmaceutical manufacturing, it serves as a key intermediate. It is used in the synthesis of active ingredients and chiral building blocks where precise stereochemistry is required. Personal care formulators use it in hair waving and straightening products for styling. Controlled reduction of disulfide bonds in keratin enables permanent styling effects. Leather processors apply it during hide treatment to modify protein structure and improve softness and dye uptake. In textile processing, it supports fiber preparation and finishing steps where controlled pH and reducing conditions are needed. Thiolactic acid is supplied as a liquid, typically at 80–85% aqueous solution. Higher purity grades are available for pharmaceutical applications. Technical-grade material is standard for industrial textile and leather uses. Pharmaceutical-grade supply is available for specific customers. This supply is for customers requiring documentation aligned with GMP manufacturing standards. The material ensures high performance across diverse industrial, cosmetic, and medicinal chemical applications. Contact us for supply of Thiolactic acid Request Quote

Other Names (Synonyms)

alpha-mercaptopropionic acid | alpha-mercaptopropanoic acid | 2-thiolpropionic acid | 2-Mercaptopropionic acid | 2-thiolactic acid | 2-mercaptopropanoic acid | PROPANOIC ACID, 2-MERCAPTO- | Propionic acid, 2-mercapto-

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point12 °C
Boiling Point91 °C @ Press: 9 Torr
Density1.193 g/cm³ @ Temp: 19.2 °C
Flash Point190 °F
AppearanceClear colorless to slightly yellow liquid
ColorClear colorless to slightly yellow
Odorat 0.01 % in propylene glycol. meaty sulfurous roasted
FormLiquid
Water SolubilityMISCIBLE
Vapor Pressure1.7 hPa (20 °C)
Refractive Indexn 20/D 1.481(lit.)
pH2 (H2O, 20℃)(undiluted)
Log P1.15 at 20℃

Safety & Handling

Danger
GHS05· CorrosiveGHS06· Toxic

Hazard Statements

H301Toxic if swallowed
H311Toxic in contact with skin
H314Causes severe skin burns and eye damage
H330Fatal if inhaled

Precautionary Statements

P260Do not breathe dust/fume/gas/mist/vapours/spray.
P262Do not get in eyes, on skin, or on clothing.
P264Wash … thoroughly after handling.
P270Do not eat, drink or smoke when using this product.
P271Use only outdoors or in a well-ventilated area.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P284In case of inadequate ventilation wear respiratory protection.
P316Get emergency medical help immediately.
P320Specific treatment is urgent (see … on this label).
P321Specific treatment (see … on this label).
P330Rinse mouth.
P363Wash contaminated clothing before reuse.
P405Store locked up.
P501Dispose of contents/container in accordance with local regulations.
P316Get emergency medical help immediately.
P352IF ON SKIN: Wash with plenty of water.
P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P364Take off immediately all contaminated clothing and wash it before reuse.
P233Store in a well-ventilated place. Keep container tightly closed.
P331Rinse mouth. Do NOT induce vomiting.
P354IF ON SKIN: Take off immediately all contaminated clothing. Rinse skin with water/shower.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code29309070
UN Number2936
ADR Class6.1
Packing GroupII
WGK (Germany)1