Melting point :-168 °C
Boiling point :20 °C(lit.)
Density :0.627 g/mL at 20 °C(lit.)
vapor pressure :14.97 psi ( 20 °C)
refractive index :n20/D 1.364
Flash point :-57 °C
storage temp. :−20°C
solubility :Soluble in alcohol, benzene, and ether (Weast, 1986)
pka :>14 (Schwarzenbach et al., 1993)
color :Colorless to Almost colorless
Water Solubility :130 mg/kg at 25 °C (shake flask-GC, McAuliffe, 1966)
BRN :505980
Henry's Law Constant :(atm?m³/mol): 0.535 at 25 °C (Hine and Mookerjee, 1975)
CAS DataBase Reference :563-45-1(CAS DataBase Reference)
NIST Chemistry Reference :1-Butene, 3-methyl-(563-45-1)
EPA Substance Registry System :3-Methyl-1-butene (563-45-1)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H224 Extremely flammable liquid and vapour Flammable liquids Category 1 Danger H304 May be fatal if swallowed and enters airways Aspiration hazard Category 1 Danger H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning H411 Toxic to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 2
Precautionary statements:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233 Keep container tightly closed. P273 Avoid release to the environment. P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. P331 Do NOT induce vomiting. P403+P233 Store in a well-ventilated place. Keep container tightly closed.