ICSC 1042 - PARALDEHYDE

[List of Chemicals] [Risk Notes] [Risk Phrases] [Safety Phrases] [Danger Symbols]

PARALDEHYDE

ICSC: 1042
_{October 2002}

p-Acetaldehyde
Paracetaldehyde
2,4,6-Trimethyl-1,3,5-trioxane

CAS No: 123-63-7
RTECS No: YK0525000
UN No: 1264
EC No: 605-004-00-1

C₆H₁₂O₃
Molecular mass: 132.2

TYPES OF HAZARD / EXPOSURE	ACUTE HAZARDS / SYMPTOMS	PREVENTION	FIRE FIGHTING
FIRE	Highly flammable.	NO open flames, NO sparks, and NO smoking.	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.	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.)	F Symbol R: 11 S: (2-)9-16-29-33 UN Hazard Class: 3 UN Pack Group: III	Do not transport with food and feedstuffs.

EMERGENCY RESPONSE	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
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 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.

PHYSICAL PROPERTIES	ENVIRONMENTAL DATA
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 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

IPCS
International
Programme on
Chemical Safety

Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2002

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Updated by AS. Approved by EC. Last update: 21.03.2003