INTOX Home Page
PARALDEHYDE ICSC: 1042
Date of Peer Review: October 2002

p-Acetaldehyde
Paracetaldehyde
2,4,6-Trimethyl-1,3,5-trioxane
CAS # 123-63-7 C6H12O3
RTECS # YK0525000 Molecular mass: 132.2
UN # 1264
EC # 605-004-00-1
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Highly flammable.
NO open flames, NO sparks, and NO smoking.
Water spray, alcohol-resistant foam, dry powder, carbon dioxide.
EXPLOSION Above 24C explosive vapour/air mixtures may be formed.
Above 24C use a closed system, ventilation, and explosion-proof electrical equipment.
In case of fire: keep drums, etc., cool by spraying with water.
EXPOSURE


Inhalation Burning sensation. Cough. Shortness of breath. Further see Ingestion.
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Refer for medical attention.
Skin Redness. Pain.
Protective gloves.
Remove contaminated clothes. Rinse and then wash skin with water and soap.
Eyes Redness. Pain.
Safety spectacles, 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 in the throat and chest. Nausea. Vomiting. Diarrhoea. Drowsiness. Unconsciousness.
Do not eat, drink, or smoke during work.
Do NOT induce vomiting. 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 non plastic containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place. (Extra personal protection: filter respirator for organic gases and vapours.)
Do not transport with food and feedstuffs.
EU Classification
Symbol: F
R: 11
S: (2-)-9-16-29-33
UN Classification
UN Hazard Class: 3
UN Pack Group: III
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-30S1264
NFPA Code: H2; F3; R1;
Fireproof. Separated from food and feedstuffs, bases and oxidants.
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

SEE IMPORTANT INFORMATION ON BACK


PARALDEHYDE ICSC: 1042
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID, WITH CHARACTERISTIC ODOUR.

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

CHEMICAL DANGERS:
The substance decomposes on standing, under the influence of air and light. The substance decomposes on heating producing toxic fumes. Reacts with bases and oxidants. Attacks plastic.

OCCUPATIONAL EXPOSURE LIMITS:
TLV not established.
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its vapour and by ingestion.

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 20C.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is irritating to the eyes, the skin and the respiratory tract. The substance may cause effects on the central nervous system.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
The substance may have effects on the nervous system, resulting in addiction. The substance may have effects on the kidneys and liver, resulting in impaired functions.
PHYSICAL PROPERTIES
Boiling point: 124.5C
Melting point: 12.6C
Density: 0.99 g/cm^3
Solubility in water, g/100 ml at 13C: 12
Vapour pressure, kPa at 20C: 1
Relative vapour density (air = 1): 4.5
Flash point: 24C c.c.
Auto-ignition temperature: 235C
Explosive limits, vol% in air: 1.3-17.0
Octanol/water partition coefficient as log Pow: 0.67
ENVIRONMENTAL DATA

NOTES

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