Product Identification

Product Name

3-Mercaptopropionic acid

Synonyms

3-Thiopropionic acid
beta-Mercaptopropanoic acid

CAS

107-96-0

Formula

C3H6O2S

Molecular Weight

106.14

EINECS

203-537-0

RTECS

UF5270000

RTECS Class

Other

Beilstein/Gmelin

773807

Beilstein Reference

4-03-00-00726

EC Class

toxic, corrosive

Physical and Chemical Properties

Appearance

Amorphous crystals or clear liquid, strong, acrid, sulfide-like odor, stench.

Solubility in water

Soluble

Melting Point

17 - 19

Boiling Point

217

Vapor Pressure

0.05 (25 C)

Density

1.2199 g/cm3 (20 C)

pKa/pKb

4.34 (pKa)

Partition Coefficient

.43

Heat Of Vaporization

50.0 kJ/mol

Heat Of Combustion

-2142 kJ/mol

Usage

Stabilizer, antioxidant, catalyst, chemical intermediate.

Refractive Index

1.491 (20 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. 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. Do not get in eyes, on skin, or on clothing. Avoid contact with heat, sparks and flame. Do not ingest or inhale. Use only in a chemical fume hood.

Hazards Identification

Ingestion

Harmful if swallowed. 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. Causes chemical burns to the respiratory tract.

Skin

Causes skin burns.

Eyes

Causes eye burns.

Hazards

Contact with metals may evolve flammable hydrogen gas.

EC Risk Phrase

R 25 34

EC Safety Phrase

S 26 36/37/39 45

UN (DOT)

2922

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.

Poison Class

2

Fire Fighting Measures

Flash Point

93

Autoignition

350

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.

Lower exp. limit

2.2

Fire Potential

Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.

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

Incompatibilities

Bases - oxidizing agents - reducing agents.

Stability

Has not been fully evaluated.

Decomposition

Carbon monoxide, oxides of sulfur, carbon dioxide.

Combustion Products

Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

2922

Hazard Class

8

Packing Group

I; II; III

HS Code

2930 90 70