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PARALDEHYDE
ICSC: 1042
Peer-Review Status: 10.08.2002 Validated
p-Acetaldehyde
Paracetaldehyde
2,4,6-Trimethyl-1,3,5-trioxane 
CAS #: 123-63-7 RTECS #: YK0525000
UN #: 1264
EC #: 605-004-00-1
EINECS #: 204-639-8
    Formula: C6H12O3
Molecular mass: 132.2

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Highly flammable.  NO open flames, NO sparks and NO smoking.  Use water spray, alcohol-resistant foam, dry powder, carbon dioxide. 
EXPLOSION Above 24°C explosive vapour/air mixtures may be formed.  Above 24°C 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.  Use 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.  Wear 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 refer for medical attention. 
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 one or two glasses of water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Remove all ignition sources. Personal protection: filter respirator for organic gases and vapours adapted to the airborne concentration of the substance. Collect leaking and spilled liquid in sealable non-plastic containers as far as possible. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations.  Do not transport with food and feedstuffs. 
EC Classification
Symbol: F; R: 11; S: (2)-9-16-29-33 
UN Classification
UN Hazard Class: 3; UN Pack Group: III 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-30S1264.
NFPA Code: H2; F3; R1. 
Fireproof. Separated from food and feedstuffs, bases and oxidants. 

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
Decomposes on heating. This produces toxic fumes. Decomposes under the influence of air and light. Reacts with bases and oxidants. Attacks plastics. 

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 at which a harmful concentration of this substance in the air is reached on evaporation at 20°C. 

Effects of short-term exposure
The substance is irritating to the eyes, skin and 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. This may result in addiction. The substance may have effects on the kidneys and liver. This may result in impaired functions. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: 124.5°C
Melting point: 12.6°C
Density: 0.99 g/cm³
Solubility in water, g/100ml at 13°C: 12
Vapour pressure, kPa at 20°C: 1
Relative vapour density (air = 1): 4.5
Flash point: 24°C c.c.
Auto-ignition temperature: 235°C
Explosive limits, vol% in air: 1.3-17.0
Octanol/water partition coefficient as log Pow: 0.67  
 

NOTES
 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations