Behavior in Fire: Vapors are heavier than air and may travel considerable distance to a source of ignition and flash back. Fires are difficult to control due to ease of reignition.
A colorless liquid, Butyraldehyde can react with oxidizing materials. In contact with strong acids or bases Butyraldehyde will undergo an exothermic condensation reaction. The dry aldehyde may undergo some polymerization reaction. Reacts vigorously with chlorosulfonic acid, nitric acid, sulfuric acid (oleum). [Sax, 9th ed., 1996, p. 607].
Butanal (N-butyraldehyde) is an organic compound which is the aldehyde derivative of butane. It appeases as a clear liquid.
Butyraldehye is used mainly as an intermediate in the production of synthetic resins, rubber vulcanization accelerators, solvents, and plasticizers. It is also an intermediate for the manufacture of pharmaceuticals, crop protection products, pesticides, antioxidants, tanning auxiliaries, and perfumes. Butyraldehyde has a characteristic pungent odor and it is used as a food additive.
Chiefly in the manufacture of rubber accelerators, synthetic resins, solvents, plasticizers.
A clear liquid with a pungent odor. Flash point 20°F. Boiling point 75.7°F (Hawley's). Less dense than water and insoluble in water. Vapors heavier than air.
 George A. Burdock, Encyclopedia of Food and Color Additives, Volume 1, 2000
 Sunggye Lee, Methane and Its Derivatives, 1997
Inhalation will cause irritation and possibly nausea, vomiting, headache, and loss of consciousness. Contact with eyes causes burns. Skin contact may be irritating.
colourless liquid with a very unpleasant smell
Air & Water Reactions
Highly flammable. Insoluble in water.
ChEBI: A member of the class of butanals that consists of propane bearing a formyl substituent at the 1-position. The parent of the class of butanals.