Melting point :-42 °C
Boiling point :167 °C(lit.)
Density :1.015 g/mL at 25 °C(lit.)
vapor density :4.5 (vs air)
vapor pressure :10 mm Hg ( 57.7 °C)
refractive index :n20/D 1.404(lit.)
Flash point :165 °F
storage temp. :Store below +30°C.
solubility :H2O: decomposes (when in contact with water)
form :clear liquid
color :Colorless to Almost colorless
Odor :like acetaldehyde
PH :2.5 (100g/l, H2O, 20℃)(calculated on the free acid)
explosive limit :1.3-9.5%(V)
Water Solubility :hydrolyses
Sensitive :Moisture Sensitive
Merck :14,7826
BRN :507066
Dielectric constant :18.0（16℃）
Stability :Stable. Combustible. Incompatible with strong oxidizing agents, water, moisture, most common metals, active halogen compounds, ammonia, amines.
LogP :0.33 at 20℃
CAS DataBase Reference :123-62-6(CAS DataBase Reference)
NIST Chemistry Reference :Propanoic acid, anhydride(123-62-6)
EPA Substance Registry System :Propionic anhydride (123-62-6)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501
Precautionary statements:	P280 Wear protective gloves/protective clothing/eye protection/face protection. P301+P330+P331 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P363 Wash contaminated clothing before reuse.