Thiolactic acid
Synonyms
Propanoic acid, 2-mercapto-;
FEMA No. 3180;
Category
Anionic Surfactant
> Carboxylate
>> Chain Carboxylate
>>> Mercapto Alkyl Carboxylate
>>>> Mercapto Linear Alkyl Carboxylate
Chemical Numbering System
CAS: 79-42-5
EINECS: 201-206-5
Molecular Formula & Molecular Weight
Molecular Formula: C3H6O2S
Molecular Weight: 106.14
Structure
Properties
Appearance (1), liquid; low temperature: solid.
Solubility soluble in water.
Stability stable. Easily oxidized.
Risk Liquid form: flammable material; irritation, irritation to skin, eye, respiratory system. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
rat inhalation LCLo |
700ppm[1] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent anti-oxidizing, dispersing, depilatory abilities.
Synthesis
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Liquid |
|
|
Actives, %, ≥ |
95.0 |
Test Methods
(1), Actives
GB/T 13173 Surface active agents -- Detergents -- Testing methods
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Liquid |
|
|
Heavy metals (as Pb), mg/kg, ≤ |
20 |
|
As, mg/kg, ≤ |
3 |
Test Methods
(1), Heavy metals (as Pb)
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30799 The test method of food detergents -- Determination of heavy metals
(2), As
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30797 The test method of food detergents -- Determination of total arsenic
3, Further explanation
(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.
(b), Used in cosmetics, should be test for harmful substances or furtherly test for microorganisms, according to local regulations and standards.
Major Uses
1, Typical applications
Use as antioxidant.
2, Personal care products
Hair waving or straightening agent, reducing agent, antioxidant, depilatory, masking agent in personal care products.
Manufacturers
References
[1]: ChemIDplus. 79-42-5, 2-Mercaptopropanoic acid
Update: 20140309(1); 20180917(2);