Melting point :-165 °C
Boiling point :29.9-30.1 °C (lit.)
Density :0.641 g/mL at 25 °C (lit.)
vapor density :2.4 (vs air)
vapor pressure :10.27 psi ( 20 °C)
refractive index :n20/D 1.371(lit.)
Flash point :−20 °F
storage temp. :2-8°C
solubility :alcohol: miscible(lit.)
form :Liquid
pka :>14 (Schwarzenbach et al., 1993)
color :Clear colorless
Specific Gravity :0.64
Odor :Like gasoline.
Odor Threshold :0.1ppm
explosive limit :8.7%
Water Solubility :0.15 g/L (20 ºC)
Merck :14,7122
BRN :1731629
Henry's Law Constant :0.406 at 25 °C (Hine and Mookerjee, 1975)
Dielectric constant :2.1（20℃）
Stability :Stable. Incompatible with strong oxidizing agents. Highly flammable - readily forms explosive mixtures with air.
LogP :2.4-2.66 at 25℃
CAS DataBase Reference :109-67-1(CAS DataBase Reference)
NIST Chemistry Reference :1-Pentene(109-67-1)
EPA Substance Registry System :1-Pentene (109-67-1)

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 H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
Precautionary statements:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P302+P352 IF ON SKIN: wash with plenty of soap and water. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P403+P233 Store in a well-ventilated place. Keep container tightly closed.