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METHACRYLALDEHYDEICSC: 1259
2-methylacrolein
2-Methyl-2-propenal
Isobutenal
Methacrolein
May 2018
CAS #: 78-85-3
UN #: 2396
EC Number: 201-150-1

  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. Do NOT use compressed air for filling, discharging, or handling. Use non-sparking handtools.  Use water spray, powder, alcohol-resistant foam, carbon dioxide.  In case of fire: keep drums, etc., cool by spraying with water. 

 PREVENT GENERATION OF MISTS!  
  SYMPTOMS PREVENTION FIRST AID
Inhalation Cough. Sore throat. Burning sensation.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. 
Skin Redness. Pain.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention . 
Eyes Redness. Pain. Burns. Watering of the eyes.  Wear safety spectacles, 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   Do not eat, drink, or smoke during work.  Rinse mouth. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Consult an expert! Remove all ignition sources. Ventilation. Personal protection: complete protective clothing including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Do NOT wash away into sewer. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent. Wash away remainder with plenty of water. Then store and dispose of according to local regulations. 

According to UN GHS Criteria

flam;flameskull;toxicenviro;aqua
DANGER
Highly flammable liquid and vapour
Fatal if inhaled
Toxic if swallowed or in contact with skin
Causes skin irritation
Causes serious eye irritation
Very toxic to aquatic life 

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

STORAGE
Fireproof. Separated from strong oxidants, acids, bases and food and feedstuffs. Cooled. Keep in the dark. Well closed. Keep under inert gas. Store only if stabilized. Provision to contain effluent from fire extinguishing. 
PACKAGING
Unbreakable packaging.
Put breakable packaging into closed unbreakable container.
Do not transport with food and feedstuffs. 
METHACRYLALDEHYDE ICSC: 1259
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. 

Chemical dangers
The substance may polymerize due to warming or under the influence of light, acids and bases. This generates fire or explosion hazard. Reacts violently with alkalis, amines, strong acids and peroxides. The substance can form peroxides on exposure to air, initiating explosive polymerization. 

Formula: C4H6O / CH2=C(CH3)CHO
Molecular mass: 70.1
Boiling point: 68°C
Melting point: -81°C
Relative density (water = 1): 0.8
Solubility in water, g/100ml at 20°C: 6 (soluble)
Vapour pressure, kPa at 20°C: 16
Relative vapour density (air = 1): 2.42
Flash point: -15°C
Auto-ignition temperature: 295°C
Explosive limits, vol% in air: 2.6-?
Viscosity: 0.59 mm²/s at 20°C 


EXPOSURE & HEALTH EFFECTS

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

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

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
Health effects of the substance have been investigated but none have been found 


OCCUPATIONAL EXPOSURE LIMITS
 

ENVIRONMENT
The substance is very toxic to aquatic organisms. It is strongly advised not to let the chemical enter into the environment. 

NOTES
An added stabilizer or inhibitor can influence the toxicological properties of this substance, consult an expert.
Check for peroxides prior to distillation; eliminate if found. 

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations