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METHYL VINYL KETONEICSC: 1495
3-Buten-2-one
Methylene acetone
November 2003
CAS #: 78-94-4
UN #: 1251
EC Number: 201-160-6

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Highly flammable.  Vapour/air mixtures are explosive.  NO open flames, NO sparks and NO smoking.  Closed system, ventilation, explosion-proof electrical equipment and lighting.  Use water spray, powder, alcohol-resistant foam, carbon dioxide.  In case of fire: keep drums, etc., cool by spraying with water. 

 STRICT HYGIENE!  
  SYMPTOMS PREVENTION FIRST AID
Inhalation Burning sensation. Cough. Sore throat. Shortness of breath. Laboured breathing. Headache. Dizziness. Tremor. Symptoms may be delayed. See Notes.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention. 
Skin MAY BE ABSORBED! Redness. Pain. Skin burns. Further see Inhalation.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention . 
Eyes Watering of the eyes. Redness. Pain. Severe deep burns.  Wear face shield 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 Burning sensation. Abdominal pain. Shock or collapse. Further see Inhalation.  Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. Do NOT induce vomiting. Give one or two glasses of water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Remove all ignition sources. Personal protection: chemical protection suit including self-contained breathing apparatus. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations. 

According to UN GHS Criteria

 

Transportation
UN Classification
UN Hazard Class: 6.1; UN Subsidiary Risks: 3 and 8; UN Pack Group: I 

STORAGE
Fireproof. Cool. Keep in the dark. Separated from strong reducing agents, strong oxidants and strong bases. Store only if stabilized. 
PACKAGING
 
METHYL VINYL KETONE ICSC: 1495
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS-TO-YELLOW LIQUID WITH PUNGENT ODOUR. 

Physical dangers
The vapour is heavier than air and may travel along the ground; distant ignition possible. Vapours are uninhibited and may polymerize, causing blockage of vents. 

Chemical dangers
The substance polymerizes under the influence of peroxides, heat, light and oxidants. Reacts with strong bases, strong reducing agents and strong oxidants. 

Formula: C4H6O
Molecular mass: 70.1
Boiling point: 81°C
Melting point: -7°C
Relative density (water = 1): 0.86
Solubility in water: good
Vapour pressure, kPa at 25°C: 11
Relative vapour density (air = 1): 2.4
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.1
Flash point: -7°C c.c.
Auto-ignition temperature: 491°C
Explosive limits, vol% in air: 2.1-15.6
Octanol/water partition coefficient as log Pow: 0.117 (estimated) 


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation, through the skin and by ingestion. 

Effects of short-term exposure
Lachrymation. The substance is corrosive to the eyes and skin. Corrosive on ingestion. The vapour is severely irritating to the eyes and respiratory tract. Inhalation may cause lung oedema. See Notes. The substance may cause effects on the central nervous system. 

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
Repeated or prolonged contact may cause skin sensitization. 


OCCUPATIONAL EXPOSURE LIMITS
TLV: 0.2 ppm as STEL; (skin); (SEN).
MAK skin absorption (H); MAK sensitization of skin (SH) 

ENVIRONMENT
 

NOTES
The occupational exposure limit value should not be exceeded during any part of the working exposure.
The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort.
Rest and medical observation is therefore essential.
An added stabilizer or inhibitor can influence the toxicological properties of this substance, consult an expert.
Do NOT take working clothes home. 

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations