Tg (TMA)

Dielectric Constant 1MHz

Low Dissipation Factor c/mus

FR4

Standard

135

4.7

.016

High Tg

170

4.3

.020

FR408

180

3.7

.010

BT

E-Glass

170-190

4.3

.0075

D-Glass

170-190

3.5

.0015

Polyimide

Modified

200

4.3

.011

Pure

280

4.0

.0080

PPO Polyphenylene Oxide

3.5

.0015

PTFE

2.6

.0005

Cynate Ester

250

3.4

Rogers 4003/4350

3.38/3.48

.0022/.0040

GETEK

180

3.8-4.2

.010-.015

Nelco 4000-8000

140-250

3.5-4.4

.0060-.27

Nelco 4000-13

210

3.6-3.8

.014