Melting point :-148 °C
Boiling point :26 °C(lit.)
Density :0.659 g/mL at 25 °C(lit.)
vapor pressure :11.91 psi ( 20 °C)
refractive index :n20/D 1.389(lit.)
Flash point :40 °F
storage temp. :0-6°C
solubility :Soluble in acetone, alcohol, benzene, and ether (Weast, 1986)
form :Liquid
pka :>14 (Schwarzenbach et al., 1993)
color :Clear colorless
Water Solubility :558 mg/kg at 25 °C (shake flask-GC, McAuliffe, 1966)
BRN :1696934
Henry's Law Constant :0.120 at 25 °C (Hine and Mookerjee, 1975)
Stability :Stable. Highly flammable. Note low boiling point and low flash point. Incompatible with strong oxidizing agents.
CAS DataBase Reference :591-93-5(CAS DataBase Reference)
EPA Substance Registry System :1,4-Pentadiene (591-93-5)

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
Precautionary statements:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P403+P233 Store in a well-ventilated place. Keep container tightly closed.