| Dielectric constant (εr) | Dielectric loss tanδ | Density/ (g/cm3) | Coefficient of thermal expansion (CTE)/(ppm/˚C) |
PTFE | 2.1 | 0.0003 | 2.2 | 109 |
SiO2 | 3.83 | 0.0025 | 2.3 | 0.5 |
E-glass fiber | 6.11 | 0.006 | 2.53 | 4.8 |