Flash_Point:	-28.1±11.2 °C
FW:	68.117
Bolling_Point:	56.7±3.0 °C at 760 mmHg
Product_Name:	Pent-2-yne
CAS:	627-21-4
MF:	C5H8
Melting_Point:	−109 °C(lit.)
Density:	0.7±0.1 g/cm3

Bolling_Point:	56.7±3.0 °C at 760 mmHg
Molecular_Structure:	['1 . Molar refractive index 2321 ', '2 . Molar volume 943 ', '3 . Parachor （902K）2092 ', '4 . Surface tension 241 ', '5 . Dielectric constant （F/m）217 ', '6 . Polarizability 920']
LogP:	1.99
More_Info:	['1 . Appearance Colourless Liquid 。 ', '2 . Density（g/mL,25/4℃）071 ', '3 . Relative vapor density（g/mL,Atmosphere =1）Unknow ', '4 . Melting point（ºC）-109 ', '5 . Boiling point（ºC,Atmospheric pressure）55-56 ', '6 . Boiling point（ºC,52kPa）56~57 ', '7 . Refractive index(n20D) 14039 ', '8 . Flash point（ºC）-20 ', '9 . Specific rotation（º）Unknow ', '10 . Spontaneous ignition point or ignition temperature（ºC）Unknow ', '11 . Vapor pressure（kPa,25ºC）Unknow ', '12 . Saturated vapor pressure（kPa,60ºC）Unknow ', '13 . Combustion heat（KJ/mol）Unknow ', '14 . Critical temperature（ºC）Unknow ', '15 . Critical pressure（KPa）Unknow ', '16 . Oil-water（Octanol /Water ）Logarithmic Value of Distribution Coefficient Unknow ', '17 . Upper limit of explosion（%,V/V）12 ', '18 . Lower limit of explosion（%,V/V）88 ', '19 . Solubility 难Soluble in Water 。']
MF:	C5H8
Computational_Chemistry:	['1. XlogP :19 ', '2. Hydrogen Bond Donor Count :0 ', '3. Hydrogen Bond Acceptor Count :0 ', '4. Rotatable Bond Count :0 ', '5. Isotope Atom Count :N/A ', '6. TPSA 0 ', '7. Heavy Atom Count :5 ', '8. Topological Polar Surface Area :0 ', '9. Complexity :586 ', '10. Isotope Atom Count :0 ', '11. Defined Atom Stereocenter Count :0 ', '12. Undefined Atom Stereocenter Count :0 ', '13. Defined Bond Stereocenter Count :0 ', '14. Undefined Bond Stereocenter Count :0 ', '15. Covalently-Bonded Unit Count :1']
Melting_Point:	−109 °C(lit.)
Refractive_Index:	1.407
Flash_Point:	-28.1±11.2 °C
FW:	68.117
Exact_Mass:	68.062599
Vapor_Pressure:	237.4±0.0 mmHg at 25°C
Density:	0.7±0.1 g/cm3

Hazard_Codes:	F: Flammable;Xi: Irritant;
Hazard_Class:	3
Packing_Group:	II
WGK_Germany:	3
Risk_Statements(EU):	R11
Safety_Statements:	S16-S26-S36/37/39
RIDADR:	UN 3295 3/PG 2