Next wee need to specify the dielectric material since the capacitance depends on the relative permitivity, ε_r, of the dielectric material. The table below allows us to select the dielectric material. Note that currently only the selected table row is displayed. To see all table rows and select a different material, click the button. We also need the dielectric strength value, U_d, in order to determine the maximum amount of energy that can be stored by the capacitor.
Note that the table dielectric properties are for room temperature and the relative permittivity values are for frequencies less than 1 kHz. When a range of values are specified in the data sources, the lowest value in the range is chosen for both relative permittivity and dielectric strength.
Data sources: https://en.wikipedia.org/wiki/Relative_permittivity and https://en.wikipedia.org/wiki/Dielectric_strength