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4-THIAPENTANALICSC: 0515
September 1997
CAS #: 3268-49-3beta-(Methylmercapto) propionaldehyde
beta-(Methylthio) propionaldehyde
Methional
UN #: 2785
EINECS #: 221-882-5

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Combustible.  Above 58°C explosive vapour/air mixtures may be formed.  NO open flames. NO contact with hot surfaces.  Above 58°C use a closed system and ventilation.  Use water spray, powder, alcohol-resistant foam, carbon dioxide.  In case of fire: keep drums, etc., cool by spraying with water. Combat fire from a sheltered position. 

 PREVENT GENERATION OF MISTS! STRICT HYGIENE!  
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation Cough. Sore throat.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin Redness.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention . 
Eyes Redness. Pain.  Wear safety goggles or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion   Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Personal protection: chemical protection suit including self-contained breathing apparatus. Ventilation. Collect leaking and spilled liquid in sealable containers as far as possible. 

According to UN GHS Criteria

 

Transportation
UN Classification
UN Hazard Class: 6.1; UN Pack Group: III 

STORAGE
Separated from strong oxidants, strong bases, strong acids and food and feedstuffs. 
PACKAGING
Do not transport with food and feedstuffs. 
4-THIAPENTANAL ICSC: 0515
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS LIQUID WITH PUNGENT ODOUR. 

Physical dangers
The vapour is heavier than air and may travel along the ground; distant ignition possible. 

Chemical dangers
Decomposes on burning. Decomposes on contact with hot surfaces. This produces toxic fumes. Reacts with strong oxidants, strong acids and strong bases. 

Formula: C4H8OS / CH3SCH2CH2CHO
Molecular mass: 104.3
Boiling point: 165°C
Melting point: -75°C
Relative density (water = 1): 1.03
Solubility in water, g/100ml at 37.8°C: 17.5
Vapour pressure, Pa at 20°C: 100
Relative vapour density (air = 1): 3.60
Flash point: 58-63°C
Auto-ignition temperature: 255°C
Explosive limits, vol% in air: 1.3-26.1
Octanol/water partition coefficient as log Pow: -0.16  


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation. 

Effects of short-term exposure
The substance is severely irritating to the eyes, skin and respiratory tract. 

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
Repeated or prolonged contact may cause skin sensitization. 


Occupational exposure limits
 

ENVIRONMENT
 

NOTES
 

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations