Melting point :-134 °C (lit.)
Boiling point :35-38 °C (lit.)
Density :0.662 g/mL at 25 °C (lit.)
vapor density :2.4 (vs air)
vapor pressure :25.7 psi ( 55 °C)
refractive index :n20/D 1.385(lit.)
RTECS :EM7580000
Flash point :−4 °F
storage temp. :2-8°C
solubility :Chloroform, Methanol (Slightly)
form :Liquid
color :Colorless
explosive limit :8.7%
Water Solubility :Miscible with alcohol, benzene, ligroin, ethylene oxide and ether. Immiscible with water.
Merck :14,607
BRN :1361353
Dielectric constant :2.1（20℃）
Stability :Volatile
LogP :2.67
CAS DataBase Reference :513-35-9(CAS DataBase Reference)
NIST Chemistry Reference :2-Butene, 2-methyl-(513-35-9)
EPA Substance Registry System :2-Methyl-2-butene (513-35-9)

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 H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501 H304 May be fatal if swallowed and enters airways Aspiration hazard Category 1 Danger H336 May cause drowsiness or dizziness Specific target organ toxicity,single exposure; Narcotic effects Category 3 Warning P261, P271, P304+P340, P312,P403+P233, P405, P501 H341 Suspected of causing genetic defects Germ cell mutagenicity Category 2 Warning P201,P202, P281, P308+P313, P405,P501 H411 Toxic to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 2
Precautionary statements:	P201 Obtain special instructions before use. P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P273 Avoid release to the environment. P308+P313 IF exposed or concerned: Get medical advice/attention. P403+P233 Store in a well-ventilated place. Keep container tightly closed.