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PROPIONALDEHYDE ICSC: 0550
Date of Peer Review: November 2003

Propionic aldehyde
Methylacetaldehyde
Propanal
Propyl aldehyde
CAS # 123-38-6 C3H6O / CH3CH2CHO
RTECS # UE0350000 Molecular mass: 58.1
UN # 1275
EC # 605-018-00-8
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Highly flammable.
NO open flames, NO sparks, and NO smoking.
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.
EXPOSURE


Inhalation Cough. Sore throat.
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Refer for medical attention.
Skin Redness. Pain.
Protective gloves.
Remove contaminated clothes. Rinse skin with plenty of water or shower.
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 Burning sensation.
Do not eat, drink, or smoke during work.
Rinse mouth. Give plenty of water to drink. Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
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 wash away into sewer. (Extra personal protection: filter respirator for organic gases and vapours.)
EU Classification
Symbol: F, Xi
R: 11-36/37/38
S: (2-)-9-16-29
UN Classification
UN Hazard Class: 3
UN Pack Group: II
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-30S1275
NFPA Code: H2; F3; R2;
Fireproof. Separated from acids, bases and oxidants. Cool. Keep in the dark. 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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PROPIONALDEHYDE ICSC: 0550
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:
The substance can presumably form explosive peroxides. The substance may polymerize under the influence of acid(s), base(s), amines and oxidants with fire or explosion hazard. The substance decomposes on burning producing toxic gases and irritating fumes.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 20 ppm as TWA; (ACGIH 2003).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its vapour 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:
The vapour of the substance is irritating to the eyes and the respiratory tract. The substance is severely irritating to the eyes and the skin.

PHYSICAL PROPERTIES
Boiling point: 49C
Melting point: -81C
Relative density (water = 1): 0.8
Solubility in water, g/100 ml: 20
Vapour pressure, kPa at 20C: 31.3
Relative vapour density (air = 1): 2.0
Relative density of the vapour/air-mixture at 20C (air = 1): 1.3
Flash point: -30C c.c.
Auto-ignition temperature: 207C
Explosive limits, vol% in air: 2.6-17.0
Octanol/water partition coefficient as log Pow: 0.59
ENVIRONMENTAL DATA

NOTES
Check for peroxides prior to distillation; eliminate if found. An added stabilizer or inhibitor can influence the toxicological properties of this substance, consult an expert.
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