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4-THIAPENTANAL

ICSC: 0515

beta-(Methylmercapto) propionaldehyde
beta-(Methylthio) propionaldehyde
Methional
C4H8OS / CH3SCH2CH2CHO
Molecular mass: 104.3
ICSC # 0515 		CAS # 3268-49-3
RTECS # UE2285000
UN # 2785
September 10, 1997 Validated

TYPES OF HAZARD/ EXPOSURE

ACUTE HAZARDS/ SYMPTOMS

PREVENTION

FIRST AID/
FIRE FIGHTING

FIRE Combustible.
NO open flames. NO contact with hot surfaces.
Powder, alcohol-resistant foam, water spray, carbon dioxide.
EXPLOSION Above 58°C explosive vapour/air mixtures may be formed.
Above 58°C use a closed system, 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.
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.
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 take to a doctor.
•INGESTION
Do not eat, drink, or smoke during work.
Rinse mouth. Do NOT induce vomiting. Refer for medical attention.

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

Ventilation. Collect leaking liquid in sealable containers. (Extra personal protection: chemical protection suit including self-contained breathing apparatus).
Separated from strong oxidants, strong bases, strong acids, food and feedstuffs.
Do not transport with food and feedstuffs.
UN Hazard Class: 6.1
UN Packing Group: III
ICSC: 0515 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

4-THIAPENTANAL

ICSC: 0515

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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.


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.

PHYSICAL
PROPERTIES

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
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

ENVIRONMENTAL
DATA


N O T E S

Transport Emergency Card: TEC (R)-61G65c

NFPA Code: H; F1; R0;

ADDITIONAL INFORMATION



ICSC: 0515 4-THIAPENTANAL
(C) IPCS, CEC, 1994
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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