Thiolactic acid(79-42-5)
Product Identification
Product Name
Thiolactic acid
Synonyms
2-Mercaptopropanoic acid
2-Mercaptopropionic acid
2-Sulfanylpropanoic acid
CAS
79-42-5
Formula
C3H6O2S
Molecular Weight
106.14
EINECS
201-206-5
RTECS
UF5250000
RTECS Class
Other
Merck
12,9476
Beilstein/Gmelin
506218
Beilstein Reference
4-03-00-00682
EC Class
harmful, corrosive
Physical and Chemical Properties
Appearance
An oily liquid with an unpleasant odor.
Solubility in water
Miscible
Melting Point
10 - 14
Boiling Point
205
Vapor Pressure
0.1 (25 C)
Density
1.193 g/cm3 (19 C)
pKa/pKb
3.74 (pKa)
Partition Coefficient
.44
Heat Of Vaporization
48.7 kJ/mol
Usage
Substance is used in depilatory and hair waving prepns.
Refractive Index
1.4827 (13 C)
First Aid Measures
Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately.
Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
Skin
Get medical aid. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.
Handling and Storage
Storage
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container. Corrosives area.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Avoid contact with heat, sparks and flame. Do not get on skin or in eyes. Do not ingest or inhale. Use only in a chemical fume hood.
Hazards Identification
Ingestion
Causes gastrointestinal tract burns. May cause perforation of the digestive tract.
Inhalation
May cause irritation of the respiratory tract with burning pain in the nose and throat, coughing, wheezing, shortness of breath and pulmonary edema. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema.
Skin
Causes skin burns.
Eyes
Causes eye burns. Lachrymator.
Hazards
When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards. May polymerize explosively when heated or involved in a fire. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form.
EC Risk Phrase
R 22 34
EC Safety Phrase
S 26 36/37/39 45
UN (DOT)
2936
Exposure Controls/Personal Protection
Personal Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves and clothing to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Fire Fighting Measures
Flash Point
87
Fire Fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Will burn if involved in a fire. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.
Fire Potential
May burn but does not ignite readily.
Stability and Reactivity
Disposal Code
6
Stability
Has not been fully evaluated.
Incompatibilities
Strong oxidizing agents, strong bases, strong reducing agents.
Decomposition
Carbon monoxide, carbon dioxide, sulfur oxides (SOx), including sulfur oxide and sulfur dioxide.
Combustion Products
Fire may produce irritating, corrosive and/or toxic gases.
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