Melting point :−87 °C(lit.)
Boiling point :42 °C(lit.)
Density :0.683 g/mL at 25 °C(lit.)
vapor density :2.4 (vs air)
vapor pressure :6.56 psi ( 20 °C)
refractive index :n20/D 1.433(lit.)
Flash point :<−30 °F
storage temp. :Refrigerator
Dielectric constant :2.3（25℃）
Stability :Stable. Incompatible with strong oxidizing agents. Very flammable - note low flash point and low boiling point.
CAS DataBase Reference :504-60-9(CAS DataBase Reference)
EPA Substance Registry System :1,3-Pentadiene (504-60-9)

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
Precautionary statements:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233 Keep container tightly closed. P240 Ground/bond container and receiving equipment. P241 Use explosion-proof electrical/ventilating/lighting/…/equipment. P242 Use only non-sparking tools. P243 Take precautionary measures against static discharge. P280 Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P370+P378 In case of fire: Use … for extinction. P403+P235 Store in a well-ventilated place. Keep cool. P501 Dispose of contents/container to..…