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78-85-3

Name Methacrolein
CAS 78-85-3
EINECS(EC#) 201-150-1
Molecular Formula C4H6O
MDL Number MFCD00006974
Molecular Weight 70.09
MOL File 78-85-3.mol

Chemical Properties

Appearance colourless to light yellow liquid
Melting point  -81 °C
Boiling point  69 °C
density  0.85 g/mL at 25 °C(lit.)
vapor density  2.4 (vs air)
vapor pressure  121 mm Hg ( 20 °C)
refractive index  n20/D 1.416(lit.)
Fp  5 °F
storage temp.  2-8°C
solubility  Benzene (Slightly), Chloroform (Soluble), Methanol (Soluble)
form  Liquid
color  Pale yellow
Odor at 0.01 % in dipropylene glycol. wild hyacinth foliage
Stability: Stable. Incompatible with strong bases, strong oxidising agents, strong reducing agents. Light and air-sensitive. Hazardous polymerisation may occur.
Odor Threshold 0.0085ppm
Odor Type floral
Water Solubility  6 g/100 mL (20 ºC)
Sensitive  Light Sensitive
BRN  1209258
Exposure limits ACGIH: TWA 1 mg/m3
OSHA: TWA 2 mg/m3
NIOSH: IDLH 50 mg/m3; Ceiling 2 mg/m3
InChIKey STNJBCKSHOAVAJ-UHFFFAOYSA-N
LogP 0.9 at 23℃
CAS DataBase Reference 78-85-3(CAS DataBase Reference)
NIST Chemistry Reference 2-Propenal, 2-methyl-(78-85-3)
EPA Substance Registry System 78-85-3(EPA Substance)

Safety Data

Hazard Codes  F,T
Risk Statements 
R11:Highly Flammable.
R24/25:Toxic in contact with skin and if swallowed .
R34:Causes burns.
R26:Very Toxic by inhalation.
Safety Statements 
S16:Keep away from sources of ignition-No smoking .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
RIDADR  UN 2396 3/PG 2
WGK Germany  3
RTECS  OZ2625000
8-23
TSCA  Yes
HazardClass  3
PackingGroup  II
HS Code  29121900
Safety Profile
Poison by ingestion and sktn contact. Moderately toxic by inhalation. Severe eye and skin irritant. Mutation data reported. Dangerously flammable liquid when exposed to heat, flame, or oxidizers. Can react vigorously with oxidizing materials. To fight fire, use CO2, alcohol foam, foam, dry chemical. When heated to decomposition it emits acrid smoke and irritating fumes. See also ALDEHYDES.
Hazardous Substances Data 78-85-3(Hazardous Substances Data)

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