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4-THIAPENTANAL
ICSC: 0515
Peer-Review Status: 10.09.1997 Validated
beta-(Methylmercapto) propionaldehyde
beta-(Methylthio) propionaldehyde
Methional 
CAS #: 3268-49-3 RTECS #: UE2285000
UN #: 2785
EINECS #: 221-882-5
    Formula: C4H8OS / CH3SCH2CH2CHO
Molecular mass: 104.3

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Combustible.  NO open flames. NO contact with hot surfaces.  Use water spray, powder, alcohol-resistant foam, carbon dioxide. 
EXPLOSION Above 58°C explosive vapour/air mixtures may be formed.  Above 58°C use a closed system and ventilation.  In case of fire: keep drums, etc., cool by spraying with water. Combat fire from a sheltered position. 
 
EXPOSURE   PREVENT GENERATION OF MISTS! STRICT HYGIENE!   
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
PACKAGING & LABELLING
Personal protection: chemical protection suit including self-contained breathing apparatus. Ventilation. Collect leaking and spilled liquid in sealable containers as far as possible.  Do not transport with food and feedstuffs. 
EC Classification
 
UN Classification
UN Hazard Class: 6.1; UN Pack Group: III 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-61G65C.
NFPA Code: H; F1; R0. 
Separated from strong oxidants, strong bases, strong acids and food and feedstuffs. 

IMPORTANT DATA
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. 

Occupational exposure limits
TLV (NOT-ESTABLISHED):. 

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

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

Effects of long-term or repeated exposure
Repeated or prolonged contact may cause skin sensitization. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
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  
 

NOTES
 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations