FR-2
FR-2 is an abbreviation for Flame Resistant 2. It is a paper material impregnated with a phenolic resin, used in the manufacture of printed circuit boards. FR-2 is widely used to build low-end consumer electronic equipment.
| Property | Value |
| Dielectric Constant (Permittivity) | 4.5 @1 MHz |
| Dissipation Factor | 0.024-0.26 @1 MHz |
| Dielectric Strength | 740 V/mil |