1,2-Ethanedithiol

  • Ethylenedimercaptan
  • Dithioethylene glycol
  • s-Ethylene dimercaptan
  • Ethylenedithiol
  • 2-Mercaptoethanethiol
Formula
HSCH2CH2SH
Structure
Description
Colorless liquid, unpleasant disagreeable odor.
Uses
Used as a metal chelating agent.

Registry Numbers and Inventories.
CAS
540-63-6
EC (EINECS/ELINCS)
208-752-3
EC Class
flammable, toxic
R 10 23/24/25
S 23 36/37 45
RTECS
KI3325000
RTECS class
Other
UN (DOT)
3336
Merck
13,3760
Beilstein/Gmelin
505946
Beilstein Reference
4-01-00-02450
Swiss Giftliste 1
G-1152
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C2H6S2
Formula mass
94.20
Melting point, °C
-41
Boiling point, °C
146 - 149
Vapor pressure, mmHg
6.5 (25 C)
Saturation Concentration
6317 ppm at 20 C (calc.)
Density
1.374 g/cm3
Solubility in water
Soluble
Refractive index
1.5545 (20 C)
pKa/pKb
9.37 (pKa)
Partition coefficient, pKow
1.31
Heat of vaporization
37.9 kJ/mol

Hazards and Protection.
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.
B3 D1B
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.
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.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container.
Disposal code
6
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Bases - oxidizing agents - reducing agents - alkali metals.
Decomposition
Carbon monoxide, oxides of sulfur, carbon dioxide, hydrogen sulfide.

Fire.
Flash Point,°C
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.
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.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.

Health.
Poison_Class
4
Exposure effects
   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.

First aid
 
   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.

Transport.
UN number
3336
Response guide
Hazard class
3
Packing Group
I; II; III
 
HS Code
2930 90 70