Melting point :-160 °C
Boiling point :30 °C(lit.)
Density :0.62 g/mL at 25 °C(lit.)
vapor density :2.6 (vs air)
vapor pressure :11.17 psi ( 20 °C)
refractive index :n20/D 1.354(lit.)
Flash point :−51 °C
storage temp. :2-8°C
solubility :0.048g/l
form :Liquid
pka :>14 (Schwarzenbach et al., 1993)
color :Clear colorless
Odor :gasoline-like odor
explosive limit :1.3-7.6%(V)
Odor Threshold :1.3ppm
Water Solubility :Miscible with water, hydrocarbons, oils, alcohol and ether.
λmax :λ: 192 nm Amax: 1.00
λ: 210 nm Amax: 0.30
λ: 220 nm Amax: 0.07
λ: 240-400 nm Amax: 0.01 BRN :1730723
Henry's Law Constant :(atm?m³/mol): 1.24 at 25 °C (approximate - calculated from water solubility and vapor pressure)
Exposure limits :ACGIH TLV: TWA 600 ppm (adopted).
Dielectric constant :1.8（20℃）
Stability :Stable. Extremely flammable. Incompatible with strong oxidizing agents. Vapour-air mixtures explosive in certain proportions. Incompatible with rubber, various plastics. The vapour, being heavier than air, may roll over surfaces and collect in low points. Note low flash point.
LogP :3.4 at 20℃
CAS DataBase Reference :78-78-4(CAS DataBase Reference)
NIST Chemistry Reference :Butane, 2-methyl-(78-78-4)
EPA Substance Registry System :2-Methylbutane (78-78-4)

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 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 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.