FR4 sheet | ||||||
Properties | Unit | Grade | ||||
FR-4,Grade A | ||||||
Flexural strength perpendicular to laminations (A: under normal conditions E-1/150: 150±5 °C . Thickness:≥1.6mm) | ≥ | Mpa | 340 | |||
Compression strength perpendicular to laminations | ≥ | Mpa | 350 | |||
Impact Strength parallel to laminations (Charpy,Thickness:≥5mm) | ≥ | kJ/m2 | 33 | |||
Insulation Resistance after immersion in water (D-24/23) | ≥ | Ω | 5.0×108 | |||
Dielectric strength perpendicular to laminations (in 90±2°C transformer oil, 1 mm in thickness) | ≥ | MV/m | 11.8 | |||
Breakdown voltage parallel to laminations (in 90±2°C transformer oil) | ≥ | KV | 35 | |||
Permittivity (50MHz) | ≤ | — | 5.5 | |||
Dissipation factor (50Hz) | ≤ | — | 0.035 | |||
Water absorption (D-24/23, 3mm in thickness) | ≤ | mg | 20 | |||
Density | g/cm3 | 2.0 | ||||
Flammability | Class | V-0,V-1 | ||||
Color | — | Natural |