Melting point :-112 °C
Boiling point :34 °C(lit.)
Density :0.83 g/mL at 25 °C(lit.)
vapor density :2 (vs air)
vapor pressure :29.43 psi ( 55 °C)
refractive index :n20/D 1.366(lit.)
Flash point :−35 °F
storage temp. :2-8°C
solubility :425-450g/l
form :Liquid
color :Clear
Odor :Ethereal; characteristic; sweet, alcoholyc; like natural gas.
explosive limit :1.9-36%(V)
Water Solubility :40 g/100 mL (20 ºC)
FreezingPoint :-112.13℃
Merck :14,7856
BRN :79763
Henry's Law Constant :Not an environmentally important parameter because propylene oxide reacts rapidly with water
Exposure limits :TLV-TWA 50 mg/m³ (20 ppm) (ACGIH), 240 mg/m³ (100 ppm) (OSHA); IDLH 2000 ppm.
Stability :Stable. Incompatible with acids, bases, oxidizing agents, copper, copper alloys, brass, bronze, iron, metal chlorides, peroxides and a wide variety of other materials. Reacts with compounds containing labile hydrogen. Extremely flammable - note low boiling point, low flash point and very wide explosion limits. Moisture sensitive.
LogP :0.030
CAS DataBase Reference :75-56-9(CAS DataBase Reference)
IARC :2B (Vol. Sup 7, 60) 1994
NIST Chemistry Reference :Propylene oxide(75-56-9)
EPA Substance Registry System :Propylene oxide (75-56-9)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H224 Extremely flammable liquid and vapour Flammable liquids Category 1 Danger H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning H340 May cause genetic defects Germ cell mutagenicity Category 1A, 1B Danger H350 May cause cancer Carcinogenicity Category 1A, 1B Danger
Precautionary statements:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233 Keep container tightly closed. 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. P308+P313 IF exposed or concerned: Get medical advice/attention. P403+P233 Store in a well-ventilated place. Keep container tightly closed.