$$\require{cancel}$$
The electromagnetic properties of dielectric materials are quantified primarily by relative permittivity $$\epsilon_r$$ (Section 2.3), which ranges from very close to 1 upward to roughly 50, and is less than 6 or so for most commonly-encountered materials having low moisture content. The permeability of dielectric materials is approximately equal to the free-space value (i.e., $$\mu\approx\mu_0$$); therefore, these materials are said to be “non-magnetic.”