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.)
Flash point :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
Odor Type :floral
Odor Threshold :0.0085ppm
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 Stability :Stable. Incompatible with strong bases, strong oxidising agents, strong reducing agents. Light and air-sensitive. Hazardous polymerisation may occur.
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 :Methacrolein (78-85-3)

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 H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501 H330 Fatal if inhaled Acute toxicity,inhalation Category 1, 2 Danger P260, P271, P284, P304+P340, P310,P320, P403+P233, P405, P501 H341 Suspected of causing genetic defects Germ cell mutagenicity Category 2 Warning P201,P202, P281, P308+P313, P405,P501 H410 Very toxic to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 1 Warning P273, P391, P501
Precautionary statements:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.