Melting point :-180 °C (lit.)
Boiling point :37-38 °C (lit.)
Density :0.65 g/mL at 25 °C (lit.)
vapor pressure :8.17 psi ( 20 °C)
refractive index :n20/D 1.382(lit.)
Flash point :−1 °F
storage temp. :Flammables area
solubility :Soluble in alcohol, benzene, and ether (Weast, 1986)
pka :>14 (Schwarzenbach et al., 1993)
form :Liquid
Specific Gravity :0.650
color :Clear colorless
Water Solubility :203 mg/kg at 25 °C (shake flask-GC, McAuliffe, 1966)
BRN :1718794
Henry's Law Constant :0.225 at 25 °C (approximate - calculated from experimentally determined water solubility and vapor pressure values)
Stability :Stable. Highly flammable - note low flash point. Incompatible with oxidizing agents.
CAS DataBase Reference :627-20-3(CAS DataBase Reference)
EPA Substance Registry System :cis-2-Pentene (627-20-3)

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 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 H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233 Keep container tightly closed. P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. 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. P331 Do NOT induce vomiting.