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.

Accidental Release Measures

Small spills/leaks

Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container.

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.

Transport Information

UN Number

2936

Hazard Class

6.1

Packing Group

II

HS Code

2930 90 70