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DIMETHYL DISULFIDEICSC: 1586
June 2015
CAS #: 624-92-0Methyl disulfide
Disulfide, dimethyl-
DMDS
UN #: 2381
EINECS #: 210-871-0

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Highly flammable. Gives off irritating or toxic fumes (or gases) in a fire.  Above 10°C explosive vapour/air mixtures may be formed.  NO open flames, NO sparks and NO smoking.  Above 10°C use a closed system, ventilation and explosion-proof electrical equipment.  Use water spray, powder, foam, carbon dioxide.  In case of fire: keep drums, etc., cool by spraying with water. 

 PREVENT GENERATION OF MISTS!  
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation Cough. Sore throat. Headache. Nausea. Dizziness. Drowsiness.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin EASILY ABSORBED! Redness. Further see Inhalation.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention . 
Eyes Redness. Pain.  Wear safety goggles.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion See Inhalation.  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Give nothing to drink. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Evacuate danger area! Consult an expert! Remove all ignition sources. Personal protection: filter respirator for organic gases and vapours adapted to the airborne concentration of the substance. Ventilation. Do NOT wash away into sewer. Do NOT let this chemical enter the environment. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb liquid in sand or inert absorbent. Carefully collect remainder in sealable containers. Store and dispose of according to local regulations. 

According to UN GHS Criteria

flam;flameskull;toxiccancer;health hazenviro;aqua
DANGER
Highly flammable liquid and vapour
Toxic if inhaled
Harmful if swallowed
Causes serious eye irritation
May cause respiratory irritation
May cause drowsiness or dizziness
May be harmful if swallowed and enters airways
Very toxic to aquatic life with long lasting effects 

Transportation
UN Classification
UN Hazard Class: 3; UN Subsidiary Risks: 6.1; UN Pack Group: II 

STORAGE
Fireproof. Well closed. Separated from oxidants. Store in an area without drain or sewer access. Provision to contain effluent from fire extinguishing. 
PACKAGING
 
DIMETHYL DISULFIDE ICSC: 1586
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
LIQUID WITH CHARACTERISTIC ODOUR. 

Physical dangers
The vapour mixes well with air, explosive mixtures are easily formed. 

Chemical dangers
Decomposes on burning. This produces toxic and corrosive fumes including sulfur oxides. Reacts violently with oxidants. This generates fire and explosion hazard. 

Formula: C2H6S2
Molecular mass: 94.2
Boiling point: 110°C
Melting point: -85°C
Relative density (water = 1): 1.06
Solubility in water, g/l at 20°C: 2.5 (poor)
Vapour pressure, kPa at 25°C: 3.8
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.08
Flash point: 10°C c.c.
Auto-ignition temperature: >300°C
Explosive limits, vol% in air: 1.1-16
Octanol/water partition coefficient as log Pow: 1.77
Relative vapour density (air = 1): 3.2
Viscosity: 0.58 mm²/s at 20°C 


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation, through the skin and by ingestion. 

Effects of short-term exposure
The substance is irritating to the eyes and respiratory tract. The substance is mildly irritating to the skin. If swallowed the substance may cause vomiting and could result in aspiration pneumonitis. The substance may cause effects on the central nervous system. 

Inhalation risk
No indication can be given about the rate at which a harmful concentration of this substance in the air is reached on evaporation at 20°C. 

Effects of long-term or repeated exposure
 


Occupational exposure limits
TLV: 0.5 ppm as TWA; (skin) 

ENVIRONMENT
It is strongly advised not to let the chemical enter into the environment. The substance is very toxic to aquatic organisms. The substance may cause long-term effects in the aquatic environment. 

NOTES
 

ADDITIONAL INFORMATION
  EC Classification
Symbol: F, Xn, N; R: 11-20/22-36/37-43-50/53; S: 16-26-33-36/37-60-61 

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    See Also:
       Toxicological Abbreviations
       DIMETHYL DISULFIDE (JECFA Evaluation)