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CROTONALDEHYDE ICSC: 0241
Date of Peer Review: May 2003

Propylene aldehyde
2-Butenal
beta-Methylacrolein
Methyl propenal
CAS # 4170-30-3 C4H6O / CH3CH=CHCHO
RTECS # GP9499000 Molecular mass: 70.1
UN # 1143
EC # 605-009-00-9
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Highly flammable. Many reactions may cause fire or explosion.
NO open flames, NO sparks, and NO smoking. NO contact with oxidants and incompatible substances (see Chemical Dangers).
Powder, alcohol-resistant foam, water spray, carbon dioxide.
EXPLOSION Vapour/air mixtures are explosive.
Closed system, ventilation, explosion-proof electrical equipment and lighting. Do NOT use compressed air for filling, discharging, or handling.
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!
IN ALL CASES CONSULT A DOCTOR!
Inhalation Burning sensation. Cough. Laboured breathing. Shortness of breath. Sore throat. Symptoms may be delayed (see Notes).
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Refer for medical attention. Half-upright position. Artificial respiration may be needed.
Skin Redness. Burning sensation. Pain.
Protective gloves. Protective clothing.
Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.
Eyes Corrosive. Redness. Pain. Severe deep burns.
Face shield, 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 Abdominal pain. Burning sensation. Diarrhoea. Nausea. Vomiting.
Do not eat, drink, or smoke during work. Wash hands before eating.
Rinse mouth. Give plenty of water to drink. Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. Remove all ignition sources. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Do NOT absorb in saw-dust or other combustible absorbents. Do NOT let this chemical enter the environment. Chemical protection suit including self-contained breathing apparatus.
Airtight. Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs. Marine pollutant.
EU Classification
Symbol: F, T+, N
R: 11-24/25-26-37/38-41-48/22-50-68
S: (1/2-)-26-28-36/37/39-45-61
UN Classification
UN Hazard Class: 6.1
UN Subsidiary Risks: 3
UN Pack Group: I
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-61GTF1-I
NFPA Code: H4; F3; R2;
Fireproof. Separated from food and feedstuffs. See Chemical Dangers. Cool. Keep in the dark. Well closed. Store only if stabilized.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 1999

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CROTONALDEHYDE ICSC: 0241
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID, WITH PUNGENT ODOUR. TURNS PALE YELLOW ON EXPOSURE TO LIGHT AND AIR.

PHYSICAL DANGERS:
The vapour is heavier than air and may travel along the ground; distant ignition possible.

CHEMICAL DANGERS:
The substance can presumably form explosive peroxides. The substance may polymerize with fire or explosion hazard. The substance is a strong reducing agent and reacts violently with oxidants and many other substances causing fire and explosion hazard. Attacks plastic and many other substances.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 0.3 ppm; (Ceiling value); (skin); A3; (ACGIH 2003).
MAK: H; Carcinogen category: 3B; (DFG 2002).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its vapour, through the skin and by ingestion.

INHALATION RISK:
A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20C.

EFFECTS OF SHORT-TERM EXPOSURE:
Lachrymation. The vapour is severely irritating to the skin, the respiratory tract, is corrosive to the eyes. Inhalation of high concentrations may cause lung oedema (see Notes). Inhalation of high concentrations may cause death. Medical observation is indicated.

PHYSICAL PROPERTIES
Boiling point: 104C
Melting point: (trans) -76.5; (cis) -69C
Relative density (water = 1): 0.85
Solubility in water, g/100 ml: 15-18
Vapour pressure, kPa at 20C: 4.0
Relative vapour density (air = 1): 2.41
Relative density of the vapour/air-mixture at 20C (air = 1): 1.06
Flash point: 13C o.c.
Auto-ignition temperature: 232.2C
Explosive limits, vol% in air: 2.1-15.5
Octanol/water partition coefficient as log Pow: 0.63
ENVIRONMENTAL DATA
The substance is toxic to aquatic organisms.
NOTES
The occupational exposure limit value should not be exceeded during any part of the working exposure. Rinse contaminated clothes (fire hazard) with plenty of water. Check for peroxides prior to distillation; eliminate if found. Crotonaldehyde is stabilized with water. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation is therefore essential.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 1999