Electrostatics: relative permittivity

Hi,

I am solving an electrostatics model which includes conducting and insulating material. What is the relative permittivity value of conducting material used? All the in built materials use the value as '1' for epsilon; where it should be infinity in theory. Also, I am getting the correct answer using it as '1', but that would be incorrect as I am ignoring the shielding in conductors in this case.

Do the relative permittivity have its usual meaning in COMSOL?

Thanks,
K