Single-sided
Solid materials
Standard | ||
Material type | FR4 (Tg 135 °C); FR2; CEM1, CEM3 | P91 (polyamide), IMS HA42 |
Thickness without the basic copper | FR4
FR4 FR2 CEM1 CEM3 | FR IMS HA42 |
Basic copper | 18µm; 35µm; | 70µm; 105µm, 140µm, 175µm |
Thickness tolerance inc. basic copper | MIL-S-13949H tolerance,
last edition, grade II IPC 4101A grade B | |
Material characteristics | Permittivity er at 1MHz
Dielectric loss tand at 1MHz Resistance to current leakage CTI Electrical strength (min.) Fire-retardant class | 4.6 - 4.9
0.019–0.027 250 degree 45kV/mm UL 94V-0 |