CAS142-82-5
FormulaC7H16
SynonymAlkane C7, Dipropyl methane, n-Heptane, Heptyl hydride, Heptane, Heptane
Density0.68368 (20 c)
Dielectric Constant1.925
Auto/Self Ignition Temperaturetemp. 204 c
Surface Tension19.7 dynescm
Flash Point (Abel)-7 C
Refractive Index @ 20ยฐ C1.397
Colour+30 Saybolt
Bromine Index<5 mg Br/100g
Saturated Vapour Concentration @ 20C275 g/m^3
Upper Explosion Limit in Air7.0 % v/v
Electrical Conductivity @ 20C<1 pS/m
Aniline point61 C
Pour point<-50 C
Kauri-Butanol Number32
Viscosity @ 25ยฐC0.64 mm^2/s
Coefficient of Cubic Expansion @ 20C13 10^-4/C
Distillation - Initial Boiling Point95 C
Relative Evaporation Rate (nBuAc=1)3.9
Relative Evaporation Rate (Ether=1)3.0
Antoine Constant A #7.72070 kPa, C
Temperature Limits for Antoine Equation+30 to +90 C
Vapour Pressure @ 0C2.7 kPa
Vapour Pressure @ 20C6.8 kPa
Paraffins70 % m/m
Naphthenes30 % m/m
Benzene<3 mg/kg
n-Hexane<0.1 % m/m
Sulphur<0.5 mg/kg
Lower Explosion Limit in Air1.0 % v/v
Auto Ignition Temp215 C (ASTM E659)
Surface Tension @ 20C21 mN/m
Thermal Conductivity @ 20C0.12 W/m/C
Hildebrand Solubility Parameter7.5 (cal/cm^3)^1/2
Hydrogen Bonding Index0
Fractional Polarity0
Density @ 15 ยฐ C0.711 kg/L
Distillation - Dry Point99 C
Antoine Constant B #2545,47 kPa, C
Antoine Constant C #349.430 kPa, C
Aromatics<5 mg/kg
Molecular weight99 g/mol
Odorgasoline-like odor
Insolubilityin water
Vapor Pressure45.7 mm hg
Melting Point-91 c
Refractive Index1.38764 (20 c)
Colorvolatile colorless liquid
Flash Point(cc) -3.89 c
Solubilityalcohol, ether, chloroform
Boiling Point98.428 c