beta-(Methylmercapto) propionaldehyde
beta-(Methylthio) propionaldehyde
Methional
C4H8OS / CH3SCH2CH2CHO
Molecular mass: 104.3
ICSC # 0515
CAS # 3268-49-3
RTECS # UE2285000
UN # 2785
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Combustible.
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NO open flames.
NO contact with hot surfaces.
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Powder, alcohol-resistant foam, water spray, carbon dioxide.
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Explosion
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Above 58°C explosive vapour/air mixtures may be formed.
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Above 58°C use a closed system, ventilation.
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In case of fire: keep drums, etc., cool by spraying with water.
Combat fire from a sheltered position.
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Exposure
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PREVENT GENERATION OF MISTS!
STRICT HYGIENE!
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•Inhalation
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Cough.
Sore throat.
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Ventilation, local exhaust, or breathing protection.
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Fresh air, rest.
Refer for medical attention.
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•Skin
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Redness.
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Protective gloves.
Protective clothing.
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Remove contaminated clothes.
Rinse skin with plenty of water or shower.
Refer for medical attention.
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•Eyes
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Redness.
Pain.
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Safety goggles,
or eye protection in combination with breathing protection.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Do not eat, drink, or smoke during work.
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Rinse mouth.
Do NOT induce vomiting.
Refer for medical attention.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Ventilation.
Collect leaking liquid in sealable containers.
(Extra personal protection: chemical protection suit including self-contained breathing apparatus).
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Separated from
strong oxidants,
strong bases,
strong acids,
food and feedstuffs.
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Do not transport with food and feedstuffs.
UN Hazard Class: 6.1
UN Packing Group: III
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Important Data
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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:
The substance decomposes
on burning
on contact with hot surfaces,
producing toxic fumes.
Reacts with strong oxidants, strong acids and strong bases.
Occupational Exposure Limits:
TLV not established.
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Routes of Exposure:
The substance can be absorbed into the body
by inhalation.
Inhalation Risk:
No indication can be given about the rate in which a harmful concentration in the air is reached on evaporation of this substance at 20°C.
Effects of Short-Term Exposure:
The substance
irritates severely
the eyes,
the skin and
the respiratory tract.
Effects of Long-Term or Repeated Exposure:
Repeated or prolonged contact may cause skin sensitization.
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Physical
Properties
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Boiling point: 165°C
Melting point: -75°C
Relative density (water = 1): 1.03
Solubility in water, g/100 ml at 37.8°C: 17.5
Vapour pressure, Pa at 20°C: 100
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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
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Environmental
Data
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N O T E S
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Transport Emergency Card: TEC (R)-61G65c
NFPA Code: H; F1; R0;
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ADDITIONAL INFORMATION
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ICSC: 0515
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4-THIAPENTANAL
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
the CEC or the IPCS is responsible for the use which might be made of this
information. This card contains the collective views of the IPCS Peer Review Committee and may
not reflect in all cases all the detailed requirements included in national legislation
on the subject. The user should verify compliance of the cards with the relevant legislation
in the country of use.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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