Product Identification

Product Name

Mercaptoacetic acid sodium salt

Synonyms

Acetic acid, mercapto, monosodium salt
Erhavit D
Mercaptoacetic acid sodium salt
Sodium mercaptoacetate
Thioglycolate sodium
Thioglycollic acid, sodium salt

CAS

367-51-1

Formula

C2H3NaO2S

Molecular Weight

114.1

EINECS

206-696-4

RTECS

AI7700000

RTECS Class

Tumorigen; Drug; Primary Irritant

Merck

12,4480

Beilstein/Gmelin

4569109

EC Class

toxic, irritant, sensitizing

Physical and Chemical Properties

Appearance

Colorless crystals or white powder, slight characteristic odor, hygroscopic.

Solubility in water

1000 g/L (20 C)

Melting Point

220

Usage

Used in cold-waving of hair and as a dipilatory (merck).

First Aid Measures

Ingestion

Never give anything by mouth to an unconscious person. Get medical aid immediately. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.

Inhalation

Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.

Skin

Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.

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

Store in a tightly closed container. Material darkens on exposure to air. Store in a cool, dry area away from incompatible substances.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation.

Hazards Identification

Inhalation

Causes irritation of the mucous membrane and upper respiratory tract. May cause nausea, headache, and vomiting.

Skin

Causes skin irritation.

Eyes

Causes eye irritation. May cause chemical conjunctivitis.

Ingestion

May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May cause headache.

EC Risk Phrase

R 22 36/37/38

EC Safety Phrase

S 22 26 36/37/39

UN (DOT)

3335

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 minimize contact with skin.

Respirators

A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.

Exposure Effects

Effects may be delayed.

Poison Class

3

Fire Fighting Measures

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. To extinguish fire use water spray, dry chemical, carbon dioxide, or appropriate foam.

Fire Potential

This material is probably combustible.

Accidental Release Measures

Small spills/leaks

Wash area with soap and water. Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.

Stability and Reactivity

Stability

Stable under normal temperatures and pressures. Substance undergoes color change upon exposure to air. Moisture sensitive.

Incompatibilities

Strong oxidizing agents, strong acids, iron, moisture, air.

Decomposition

Carbon monoxide, oxides of sulfur, carbon dioxide.

Transport Information

UN Number

3335

HS Code

2930 90 70