Melting point :−43.5 °C(lit.)
Boiling point :71-73 °C29 mm Hg(lit.)
Density :1.056 g/mL at 25 °C(lit.)
refractive index :n20/D 1.411(lit.)
Flash point :140 °F
solubility :Soluble[in water]
color :Colorless to Almost colorless
Water Solubility :132.7g/L(18 ºC)
Stability :Stable. Incompatible with strong bases, strong oxidizing agents. Flammable.
CAS DataBase Reference :3068-88-0(CAS DataBase Reference)
IARC :2B (Vol. 11, Sup 7, 71) 1999
EPA Substance Registry System :.beta.-Butyrolactone (3068-88-0)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H226 Flammable liquid and vapour Flammable liquids Category 3 Warning 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 H351 Suspected of causing cancer Carcinogenicity Category 2 Warning P201, P202, P281, P308+P313, P405,P501
Precautionary statements:	P201 Obtain special instructions before use. 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. P308+P313 IF exposed or concerned: Get medical advice/attention.