Melting point :-33 °C (lit.)
Boiling point :162 °C (lit.)
Density :1.146 g/mL at 25 °C (lit.)
vapor pressure :3 at 25 °C (NIOSH, 1997)
refractive index :n20/D 1.412(lit.)
Flash point :158 °F
storage temp. :-20°C
solubility :Miscible with acetone, alcohol, chloroform, and ether (Windholz et al., 1983)
form :Liquid
color :Colorless liquid with a sweet but irritating odor
Odor :pungent odor
Water Solubility :37 g/100 mL
Specific Heat Capacity :Cp(liquid): 1.69 J/(g·K), at 25℃
Sensitive :Moisture Sensitive
Merck :14,7820
Henry's Law Constant :7.6 at 25 °C (approximate - calculated from water solubility and vapor pressure)
Stability :Moisture Sensitive, Very Hygroscopic
InChIKey :VEZXCJBBBCKRPI-UHFFFAOYSA-N
CAS DataBase Reference :57-57-8(CAS DataBase Reference)
NIST Chemistry Reference :«beta»-Propiolactone(57-57-8)
IARC :2B (Vol. 4, Sup 7, 71) 1999
EPA Substance Registry System :beta-Propiolactone (57-57-8)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes 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 H330 Fatal if inhaled Acute toxicity,inhalation Category 1, 2 Danger P260, P271, P284, P304+P340, P310,P320, P403+P233, P405, P501 H350 May cause cancer Carcinogenicity Category 1A, 1B Danger
Precautionary statements:	P202 Do not handle until all safety precautions have been read and understood. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. 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.