Dielectric Constant

Material           Dielectric Constant

Teflon                    2.1
Polyethylene              2.35
Polystyrene               2.53
Quartz                    3.78
Boron Nitride             4.4
Epoxy / Glassfibre       ~4.7
Polyimide                 4.8
Glass                     5-10
Mica                      5.7-6.7
Beryllia (BeO)            6.6
Alumina (AlO)             9.9
Silicon                  12
Germanium                16