Product Identification

Product Name

Ethylene mercaptan

Synonyms

2-Mercaptoethanethiol
Dithioethylene glycol
Dithioglycol
Ethane-1,2-dithiol
Ethylenedimercaptan
Ethylenedithiol

CAS

540-63-6

Formula

C2H6S2

Molecular Weight

94.2

EINECS

208-752-3

RTECS

KI3325000

RTECS Class

Other

Merck

13,3760

Beilstein/Gmelin

505946

Beilstein Reference

4-01-00-02450

EC Class

flammable, toxic

Physical and Chemical Properties

Appearance

Colorless liquid, unpleasant disagreeable odor.

Solubility in water

Soluble

Melting Point

-41

Boiling Point

146 - 149

Vapor Pressure

6.5 (25 C)

Density

1.374 g/cm3

pKa/pKb

9.37 (pKa)

Partition Coefficient

1.31

Heat Of Vaporization

37.9 kJ/mol

Usage

Used as a metal chelating agent.

Saturation Concentration

6317 ppm at 20 C (calc.)

Refractive Index

1.5545 (20 C)

First Aid Measures

Ingestion

Do NOT induce vomiting. Allow the victim to rinse his mouth and then to drink 2-4 cupfuls of water, and seek medical advice.

Inhalation

Remove from exposure to fresh air immediately.

Skin

Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.

Eyes

Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Handling and Storage

Storage

Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.

Handling

All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.

Hazards Identification

Ingestion

Nausea may occur with low concentration exposures.

Inhalation

Decreased respiratory rate was reported in 2 persons. Respiratory depression has occurred in animals following inhalation of high concentrations.

Skin

May irritate or burn. May cause toxic effects if absorbed through the skin.

Eyes

See Skin.

Hazards

Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.

EC Risk Phrase

R 10 23/24/25

EC Safety Phrase

S 23 36/37 45

UN (DOT)

3336

Exposure Controls/Personal Protection

Personal Protection

Wear appropriate safety goggles, protective clothing and gloves.

Respirators

Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions.

Poison Class

4

Fire Fighting Measures

Flash Point

44

Fire Fighting

Wear a self-contained breathing apparatus inpressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear.

Fire Potential

HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.

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 - alkali metals.

Stability

Stable under normal temperatures and pressures.

Decomposition

Carbon monoxide, oxides of sulfur, carbon dioxide, hydrogen sulfide.

Combustion Products

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

Transport Information

UN Number

3336

Hazard Class

3

Packing Group

I; II; III

HS Code

2930 90 70