General
Synonyms: 2-methylpropionaldehyde, isobutanal, isobutyral, isobutaldehyde, isobutyl aldehyde, isobutyric aldehyde, isobutyryl aldehyde, methyl propanal, 2-methylpropanal, methyl-1-propanal, 2-methyl-1-propanal, methylpropional, valine aldehyde
Molecular formula: C4H8O
CAS No: 78-84-2
EINECS No: 201-149-6
Physical data
Appearance: colourless liquid with an extremely unpleasant smell
Melting point: -65 C
Boiling point: 63 C
Vapour density: 2.5 g/l
Vapour pressure: 66 mm Hg at 5 C
Density (g cm-3): 0.79
Flash point: -19 C (closed cup)
Explosion limits: 1.6 - 11%
Autoignition temperature: 190 C
Stability
Stable. Refrigerate. Highly flammable. Incompatible with strong oxidizing agents, strong bases, strong acids, strong reducing agents.
Toxicology
May be harmful if swallowed, inhaled or absorbed through the skin. Stench!
Toxicity data
ORL-RAT LD50 > 3000 mg kg-1
SKN-RBT LD50 > 5000 mg kg-1
IHL-RAT LC50 > 23900 mg m-3
IHL-MUS LC50 39500 mg m-3/2h
Risk phrases
R11.
Transport information
UN No 2045. Hazard class 3. Packing group II.
Personal protection
Safety glasses, good ventilation, gloves. Remove sources of ignition from the working area.
Safety phrases
S16.
