Melting point :−76 °C(lit.)
Boiling point :104 °C(lit.)
Density :0.853 g/mL at 20 °C(lit.)
vapor density :2.41 (vs air)
vapor pressure :32 mm Hg ( 20 °C)
refractive index :n20/D 1.437
Flash point :48 °F
storage temp. :2-8°C
solubility :Miscible with alcohol, benzene, gasoline, kerosene, solvent naphtha, and toluene (Hawley, 1981)
form :Colorless liquid
color :Colourless
Odor Threshold :0.023ppm
Water Solubility :Soluble in water. (150g/L) at 20°C.
Sensitive :Air Sensitive
Merck :13,2624
BRN :1209254
Henry's Law Constant :1.92 x 10^-5 atm?m³/mol (Buttery et al., 1971)
Exposure limits :NIOSH REL: TWA 2 ppm (6 mg/m³), IDLH 50 ppm; OSHA PEL: TWA 2 ppm; ACGIH TLV: ceiling 0.3 ppm (adopted).
Stability :Air sensitive. Highly flammable. Readily forms explosive mixtures with air. May polymerize in the presence of acids, alkalies or amines. Uncontrolled polymerisation may lead to a rapid temperature rise. Incompatible with acids, bases, amines, strong oxidizing agents, butadiene, ketones, oxygen. May contain a stabilizer.
LogP :0.6 at 25℃
CAS DataBase Reference :4170-30-3(CAS DataBase Reference)
IARC :3 (Vol. 63) 1995
EPA Substance Registry System :Crotonaldehyde (4170-30-3)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H225 Highly Flammable liquid and vapour Flammable liquids Category 2 Danger P210,P233, P240, P241, P242, P243,P280, P303+ P361+P353, P370+P378,P403+P235, P501 H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H318 Causes serious eye damage Serious eye damage/eye irritation Category 1 Danger P280, P305+P351+P338, P310 H330 Fatal if inhaled Acute toxicity,inhalation Category 1, 2 Danger P260, P271, P284, P304+P340, P310,P320, P403+P233, P405, P501 H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning H341 Suspected of causing genetic defects Germ cell mutagenicity Category 2 Warning P201,P202, P281, P308+P313, P405,P501 H373 May cause damage to organs through prolonged or repeated exposure Specific target organ toxicity, repeated exposure Category 2 Warning P260, P314, P501 H400 Very toxic to aquatic life Hazardous to the aquatic environment, acute hazard Category 1 Warning P273, P391, P501
Precautionary statements:	P201 Obtain special instructions before use. P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P280 Wear protective gloves/protective clothing/eye protection/face protection.