The static relative permittivity (dielectric constant) of 1,1,1,2,3,3-hexafluoropropane (HFC-236ea) and 1,1,1,3, 3-pentafluoropropane (HFC-245fa) in the liquid ph ase has been measured by a concentric cylinder-type high pressure capacitor with an LCR-meter at temperatures from 293 to 343 K and pressures up to 50 MPa. The uncertainty of the measurements is estimated to be within 1%. The relative permittivity of liquid HFC-236ea and HFC-245fa increases with increasing pressure and decreases with increasing temperature. The data obtained along an isotherm were correlated with pressure using the Owen-Brinkley equation within the experimental uncertainty. Density dependence of the relative permittivity was also investigated. Based on the experimental data the apparent dipole moment of liquid HFC-236ea and HFC-245fa were determined with the Kirkwood theory.