Relative Dielectric Constants

Material Er
Air 1.0
PTFE/glass 2800 2.2
Rogers RO 2.9
CE/goreply 3.0
BT/goreply 3.3
GETEK 3.5
CE/glass 3.7
Silicon dioxide 3.9
BT/glass 4.0
Polymide/glass 4.1
FR-4/glass 4.1
Glass cloth 6.0
Alumina 9.0
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