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Ethylene oxide(EO)

C2H4O

CAS:75-21-8



ETHYLENE OXIDE ICSC: 0155

1,2-Epoxyethane 
Oxirane 
Dimethylene oxide 
(cylinder) 
CAS # 75-21-8 C2H4O
RTECS # KX2450000 Molecular mass: 44.1
UN # 1040
EC # 603-023-00-X
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Extremely flammable. 
NO open flames, NO sparks, and NO smoking. 
Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out; in other cases extinguish with powder, alcohol-resistant foam, water spray, carbon dioxide. 
EXPLOSION Gas/air mixtures are explosive. Risk of fire and explosion as a result of violent decomposition when heated. 
Closed system, ventilation, explosion-proof electrical equipment and lighting. Use non-sparking handtools. 
In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position. 
EXPOSURE
STRICT HYGIENE! AVOID ALL CONTACT! 
IN ALL CASES CONSULT A DOCTOR! 
Inhalation Cough. Drowsiness. Headache. Nausea. Sore throat. Vomiting. Weakness. 
Closed system and ventilation. 
Fresh air, rest. Refer for medical attention. 
Skin ON CONTACT WITH LIQUID: FROSTBITE. Dry skin. Redness. Pain. 
Protective gloves. Cold-insulating gloves. Protective clothing. 
Remove contaminated clothes. ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Rinse skin with plenty of water or shower. Refer for medical attention. 
Eyes Redness. Pain. Blurred vision. 
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
Do not eat, drink, or smoke during work. Wash hands before eating. 

SPILLAGE DISPOSAL PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. NEVER direct water jet on liquid. Remove gas with fine water spray. Do NOT wash away into sewer. Gas-tight chemical protection suit including self-contained breathing apparatus. 
EU Classification 
Symbol: F+T
R: 45-46-12-23-36/37/38
S: 53-45
Note: [E]
UN Classification 
UN Hazard Class: 2.3
UN Subsidiary Risks: 2.1

EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-20S1040 or 20GTF 
NFPA Code: H2; F4; R3 
Fireproof. Cool. 
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
ETHYLENE OXIDE ICSC: 0155
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE: 
COLOURLESS COMPRESSED LIQUEFIED GAS, WITH CHARACTERISTIC ODOUR.

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

CHEMICAL DANGERS: 
The substance may polymerize due to heating, under the influence of acid(s), base(s), metal chlorides and metal oxides with fire or explosion hazard. The substance decomposes in the absence of air on heating above 560癈, causing fire and explosion hazard. Reacts violently with many compounds.

OCCUPATIONAL EXPOSURE LIMITS: 
TLV: 1 ppm as TWA; A2 (suspected human carcinogen); (ACGIH 2004). 
MAK: skin absorption (H); Carcinogen category: 2; Germ cell mutagen group: 2; (DFG 2004).
ROUTES OF EXPOSURE: 
The substance can be absorbed into the body by inhalation and through the skin in water solution.

INHALATION RISK: 
A harmful concentration of this gas in the air will be reached very quickly on loss of containment.

EFFECTS OF SHORT-TERM EXPOSURE: 
The vapour is irritating to the eyes, the skin and the respiratory tract. Water solution may cause skin blisters. Rapid evaporation of the liquid may cause frostbite.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: 
Repeated or prolonged contact may cause skin sensitization. Repeated or prolonged inhalation exposure may cause asthma. The substance may have effects on the nervous system. This substance is carcinogenic to humans. May cause heritable genetic damage to human germ cells.
PHYSICAL PROPERTIES
Boiling point: 11℃
Melting point: -111℃
Relative density (water = 1): 0.9
Solubility in water: miscible
Vapour pressure, kPa at 20℃: 146
Relative vapour density (air = 1): 1.5
Flash point: Flammable Gas
Auto-ignition temperature: 429℃
Explosive limits, vol% in air: 3-100
Octanol/water partition coefficient as log Pow: -0.3
ENVIRONMENTAL DATA
The substance is harmful to aquatic organisms. 
NOTES
Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. Anyone who has shown symptoms of asthma due to this substance should avoid all further contact with this substance. The symptoms of asthma often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential. The odour warning when the exposure limit value is exceeded is insufficient. 
Card has been partly updated in April 2005. See sections Occupational Exposure Limits, Emergency Response. 
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
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