p-Acetaldehyde
Paracetaldehyde
2,4,6-Trimethyl-1,3,5-trioxane
C6H12O3
Molecular mass: 132.2
ICSC # 1042
CAS # 123-63-7
RTECS # YK0525000
UN # 1264
EC # 605-004-00-1
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Highly flammable.
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NO open flames, NO sparks, and NO smoking.
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Water spray,
alcohol-resistant foam,
dry powder,
carbon dioxide.
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Explosion
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Above 24°C explosive vapour/air mixtures may be formed.
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Above 24°C use a closed system, ventilation, and explosion-proof electrical equipment.
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In case of fire: keep drums, etc., cool by spraying with water.
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Exposure
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•Inhalation
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Burning sensation.
Cough.
Shortness of breath.
Further
see Ingestion.
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Ventilation, local exhaust, or breathing protection.
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Fresh air, rest.
Refer for medical attention.
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•Skin
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Redness.
Pain.
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Protective gloves.
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Remove contaminated clothes.
Rinse and then wash skin with water and soap.
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•Eyes
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Redness.
Pain.
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Safety spectacles,
or eye protection in combination with breathing protection.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Burning sensation in the throat and chest.
Nausea.
Vomiting.
Diarrhoea.
Drowsiness.
Unconsciousness.
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Do not eat, drink, or smoke during work.
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Do NOT induce vomiting.
Give plenty of water to drink.
Refer for medical attention.
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Spillage Disposal
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Storage
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Packaging & Labelling
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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.)
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Fireproof.
Separated from
food and feedstuffs
,
bases
and
oxidants
.
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Do not transport with food and feedstuffs.
F symbol
R: 11
S: 2-9-16-29-33
UN Hazard Class: 3
UN Packing Group: III
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Important Data
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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.
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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 20°C.
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
.
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Physical
Properties
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Boiling point: 124.5°C
Melting point: 12.6°C
Density: 0.99
g/cm3
Solubility in water, g/100 ml at 13°C: 12
Vapour pressure, kPa at 20°C: 1
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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
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Environmental
Data
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N O T E S
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Transport Emergency Card: TEC (R)-30S1264
NFPA Code: H2; F3; R1;
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ADDITIONAL INFORMATION
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ICSC: 1042
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PARALDEHYDE
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(C) IPCS, CEC, 1994
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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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