Melting point :-91 °C
Boiling point :168 °C (lit.)
Density :0.942 g/mL at 25 °C (lit.)
refractive index :n20/D 1.501(lit.)
Flash point :118 °F
storage temp. :Flammables area
solubility :107g/l
form :Liquid
pka :pK1:5.87(+1) (25°C)
color :Clear colorless to yellow
PH :10 (100g/l, H2O, 20℃)
Water Solubility :34 g/L
Merck :14,3849
BRN :106481
Dielectric constant :10.98
LogP :1.650
CAS DataBase Reference :536-75-4(CAS DataBase Reference)
NIST Chemistry Reference :4-(C2H5)-pyridine(536-75-4)
EPA Substance Registry System :4-Ethylpyridine (536-75-4)

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 H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:	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.