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DIKETENEICSC: 1280
But-3-en-3-olide
3-Buteno-beta-lactone
4-Methylene-2-oxetanone
Acetyl ketene
Vinylaceto-beta-lactone
November 2019
CAS #: 674-82-8
UN #: 2521
EC Number: 211-617-1

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Flammable.  Above 33°C explosive vapour/air mixtures may be formed. Risk of fire and explosion on contact with acids, bases or water.  NO open flames, NO sparks and NO smoking. NO contact with acids, bases or water.  Above 33°C use a closed system, ventilation and explosion-proof electrical equipment.  Use carbon dioxide, dry sand. NO hydrous agents. NO water.  In case of fire: keep drums, etc., cool by spraying with water. NO direct contact with water. 

 PREVENT GENERATION OF MISTS!  
  SYMPTOMS PREVENTION FIRST AID
Inhalation Cough. Sore throat.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin Redness. Pain.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention if skin irritation occurs. 
Eyes Redness. Pain.  Wear safety goggles 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 See Inhalation.  Do not eat, drink, or smoke during work.  Rinse mouth. Give one or two glasses of water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Remove all ignition sources. Evacuate danger area! Consult an expert! Personal protection: filter respirator for organic gases and vapours adapted to the airborne concentration of the substance. Collect leaking liquid in covered containers. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations. NEVER direct water jet on liquid. 

According to UN GHS Criteria

flam;flameexcl mark;warn
Flammable liquid and vapour
Harmful if swallowed or if inhaled 

Transportation
UN Classification
UN Hazard Class: 6.1; UN Subsidiary Risks: 3; UN Pack Group: I 

STORAGE
Separated from acids, bases and food and feedstuffs. Well closed. Fireproof. Cool. Dry. Store only if stabilized. 
PACKAGING
Do not transport with food and feedstuffs.
Transport only if stabilized. 
DIKETENE ICSC: 1280
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS LIQUID WITH PUNGENT ODOUR. 

Physical dangers
 

Chemical dangers
The substance violently polymerizes due to warming or under the influence of acids and bases. Reacts violently with water. This generates fire or explosion hazard. 

Formula: C4H4O2
Molecular mass: 84.1
Boiling point: 127°C
Melting point: -7°C
Density (at 20°C): 1.09 g/cm³
Solubility in water at 25°C: slowly hydrolyzes
Explosive limits, vol% in air: 2-11.7
Vapour pressure, kPa at 20°C: 1
Relative vapour density (air = 1): 2.9
Flash point: 33°C c.c.
Auto-ignition temperature: 275°C
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.02 


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation of its vapour and by ingestion. 

Effects of short-term exposure
The substance may be irritating to the respiratory tract, eyes and skin. See Notes. 

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 long-term or repeated exposure
 


OCCUPATIONAL EXPOSURE LIMITS
 

ENVIRONMENT
See Notes. 

NOTES
Data are insufficiently available on the effect of this substance on human health, therefore utmost care must be taken.
Insufficient data are available on the effect of this substance on human health and environment.
An added stabilizer or inhibitor can influence the toxicological properties of this substance, consult an expert. 

ADDITIONAL INFORMATION
  EC Classification
 

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