Melting point :-103 °C
Boiling point :131-132 °C(lit.)
Density :0.751 g/mL at 25 °C(lit.)
vapor pressure :35 mm Hg ( 37.7 °C)
refractive index :n20/D 1.425(lit.)
Flash point :85 °F
storage temp. :0-6°C
form :Liquid
color :Clear colorless to slightly yellow
Water Solubility :Sparingly soluble in water( 29.1 mg/L).
BRN :1732138
CAS DataBase Reference :1942-45-6(CAS DataBase Reference)
EPA Substance Registry System :4-Octyne (1942-45-6)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H226 Flammable liquid and vapour Flammable liquids Category 3 Warning H304 May be fatal if swallowed and enters airways Aspiration hazard Category 1 Danger 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. P233 Keep container tightly closed. P240 Ground/bond container and receiving equipment. P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P331 Do NOT induce vomiting.