Melting point :-32 °C
Boiling point :27 °C(lit.)
Density :0.691 g/mL at 25 °C(lit.)
vapor pressure :11.47 psi ( 20 °C)
refractive index :n20/D 1.393(lit.)
Flash point :-25 °C
storage temp. :2-8°C
form :Liquid
Specific Gravity :0.691
color :Clear colorless to light yellow
Water Solubility :Not miscible in water.
BRN :1361340
CAS DataBase Reference :503-17-3(CAS DataBase Reference)
EPA Substance Registry System :2-Butyne (503-17-3)

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 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. P403+P233 Store in a well-ventilated place. Keep container tightly closed.