ICSC 0857 - CYCLOPENTADIENE

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CYCLOPENTADIENE	ICSC: 0857 (April 2024)
1,3-Cyclopentadiene Pentole Pyropentylene

CAS #: 542-92-7

UN #: 1993

	ACUTE HAZARDS	PREVENTION	FIRE FIGHTING
FIRE & EXPLOSION	Flammable. Above 25°C explosive vapour/air mixtures may be formed. Risk of fire and explosion on contact with incompatible substances. See Chemical Dangers.	NO open flames, NO sparks and NO smoking. Above 25°C use a closed system, ventilation and explosion-proof electrical equipment. NO contact with incompatible materials:	Use powder, foam, carbon dioxide. In case of fire: keep drums, etc., cool by spraying with water.

PREVENT GENERATION OF MISTS! STRICT HYGIENE!
	SYMPTOMS	PREVENTION	FIRST AID
Inhalation	Cough. Sore throat.	Use ventilation, local exhaust or breathing protection.	Fresh air, rest. Refer for medical attention.
Skin	Redness.	Protective gloves.	Remove contaminated clothes. Rinse and then wash skin with water and soap.
Eyes	Redness. Pain.	Wear safety goggles.	First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.
Ingestion	Nausea. Vomiting.	Do not eat, drink, or smoke during work.	Rinse mouth. Seek medical attention if you feel unwell.

SPILLAGE DISPOSAL	CLASSIFICATION & LABELLING
Evacuate danger area! Remove all ignition sources. Consult an expert! Personal protection: self-contained breathing apparatus. Collect leaking liquid in sealable containers. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations.	According to UN GHS Criteria Flammable liquid and vapour Toxic if swallowed or in contact with skin Causes serious eye irritation May cause respiratory irritation Transportation UN Classification UN Hazard Class: 3; UN Pack Group: III
STORAGE
Fireproof. Store only if stabilized. See Notes. Cooled. Separated from incompatible materials. See Chemical Dangers.
PACKAGING
Airtight. Unbreakable packaging.

CYCLOPENTADIENE

ICSC: 0857

PHYSICAL & CHEMICAL INFORMATION
Physical State; Appearance COLOURLESS LIQUID WITH CHARACTERISTIC ODOUR. Physical dangers The vapour is heavier than air. Chemical dangers The substance can readily form explosive peroxides on contact with air. The substance readily polymerizes to dimer. This generates fire or explosion hazard. The reaction is accelerated by peroxides or trichloroacetic acid. Reacts violently with potassium hydroxide. Reacts violently with strong oxidants and strong acids such as fuming nitric acid and sulfuric acid. Attacks many plastics and some forms of rubber.	Formula: C₅H₆ Molecular mass: 66.1 Boiling point: 41.5-42.0°C Melting point: -85°C Relative density (water = 1): 0.8 Solubility in water: insoluble Vapour pressure, kPa at 20°C: 45.1 (calculated) Relative vapour density (air = 1): 2.3 Flash point: -20°C Auto-ignition temperature: 640°C

PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS LIQUID WITH CHARACTERISTIC ODOUR.

Physical dangers
The vapour is heavier than air.

Chemical dangers
The substance can readily form explosive peroxides on contact with air. The substance readily polymerizes to dimer. This generates fire or explosion hazard. The reaction is accelerated by peroxides or trichloroacetic acid. Reacts violently with potassium hydroxide. Reacts violently with strong oxidants and strong acids such as fuming nitric acid and sulfuric acid. Attacks many plastics and some forms of rubber.

Formula: C₅H₆
Molecular mass: 66.1
Boiling point: 41.5-42.0°C
Melting point: -85°C
Relative density (water = 1): 0.8
Solubility in water: insoluble
Vapour pressure, kPa at 20°C: 45.1 (calculated)
Relative vapour density (air = 1): 2.3
Flash point: -20°C
Auto-ignition temperature: 640°C

EXPOSURE & HEALTH EFFECTS
Routes of exposure The substance can be absorbed into the body by inhalation. Effects of short-term exposure The substance is irritating to the eyes and respiratory tract. The substance is mildly irritating to the skin.	Inhalation risk A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C. Effects of long-term or repeated exposure

EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation.

Effects of short-term exposure
The substance is irritating to the eyes and respiratory tract. The substance is mildly irritating to the skin.

Inhalation risk
A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C.

Effects of long-term or repeated exposure

OCCUPATIONAL EXPOSURE LIMITS
TLV: 0,5 ppm as TWA

ENVIRONMENT

NOTES
Explosive limits are unknown in literature, although the substance is combustible and has a flash point < 55°C. An added stabilizer or inhibitor can influence the toxicological properties of this substance, consult an expert. The substance is normally stored in the more stable dimer form. The monomer can be stored at -80°C for only few days.

ADDITIONAL INFORMATION

EC Classification

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