Thiolactic acid

CAS Number
79-42-5
EC Number
201-206-5
Chemical Formula
C3H6O2S
Molecular Weight
106.15 g/mol
FEMA Number
FEMA 3180

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.

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

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Physical Properties

Melting Point 12 °C
Boiling Point 91 °C @ Press: 9 Torr
Density 1.193 g/cm³ @ Temp: 19.2 °C
Flash Point 190 °F
Appearance Clear colorless to slightly yellow liquid
Color Clear colorless to slightly yellow
Odor at 0.01 % in propylene glycol. meaty sulfurous roasted
Form Liquid
Water Solubility MISCIBLE
Vapor Pressure 1.7 hPa (20 °C)
Refractive Index n 20/D 1.481(lit.)
pH 2 (H2O, 20℃)(undiluted)
Log P 1.15 at 20℃

Documentation

Safety & Handling Learn More

Danger
GHS05· Corrosive GHS06· Toxic

Hazard Statements

H301 Toxic if swallowed
H311 Toxic in contact with skin
H314 Causes severe skin burns and eye damage
H330 Fatal if inhaled

Precautionary Statements

P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P262 Do not get in eyes, on skin, or on clothing.
P264 Wash … thoroughly after handling.
P270 Do not eat, drink or smoke when using this product.

Trade & Regulatory

HS Code 29309070
UN Number 2936
ADR Class 6.1
Packing Group II
WGK (Germany) 1
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