Melting point :−139 °C(lit.)
Boiling point :3.7 °C(lit.)
Density :0,62 g/cm³
vapor density :2 (vs air)
vapor pressure :1414 mm Hg ( 21 °C)
refractive index :1.3842
Flash point :−99 °F
explosive limit :9.7%
Merck :1520
BRN :1361341
Stability :Stable, but prone to polymerization in the presence of suitable catalysts. Extremely flammable. Readily forms explosive mixtures with air. Can lead to flash fires. Incompatible with strong oxidizing agents, halogens, halogen acids, magnesium perchlorate.
CAS DataBase Reference :590-18-1(CAS DataBase Reference)
EPA Substance Registry System :cis-2-Butene (590-18-1)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H220 Extremely flammable gas Flammable gases Category 1 Danger P210, P377, P381, P403 H280 Contains gas under pressure; may explode if heated Gases under pressure Compressed gas Liquefied gas Dissolved gas Warning P410+P403
Precautionary statements:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P410+P403 Protect from sunlight. Store in a well-ventilated place.