Materials / PCB Laminate
PCB Laminate FR-4 (Isola 370HR) strength, stiffness, density and thermal properties, with their source.
A panel in PCB Laminate FR-4, woven, clear-coated finish.
Process Composite Mechanical Yield strength not given (tensile used) Ultimate tensile strength 246–385 MPa source typical, in-plane: cross direction .. length direction (ASTM D3039) Flexural strength 531–621 MPa source typical: cross direction .. length direction (IPC-TM-650 2.4.4B) Elongation at break not sourced Young's modulus (stiffness) 21.9–25.8 GPa source typical, in-plane: cross direction .. length direction (ASTM D790-15e2) Density 1,920 kg/m³ source typical, 50% resin content; another FR-4 producer: Park Nelco N4000-6 (high-Tg multifunctional epoxy), not Isola 370HR Strength to weight 164 kN·m/kg Stiffness to weight 12.4 MN·m/kg Poisson's ratio 0.171–0.177 source typical, in-plane: cross direction .. length direction Shear modulus 10.2 GPa Bulk modulus 12.2 GPa Speed of sound 3,525 m/s Thermal Thermal conductivity 0.4 W/m·K source typical (ASTM E1952); direction not stated by the sheet Thermal expansion 13–14 µm/m·K source typical, in-plane X/Y-axis, below Tg (IPC-TM-650 2.4.24C) 100 mm part over a 50 °C swing 67.5 µm growth Specific heat 1,200–1,400 J/kg·K source typical (ASTM E1461); another FR-4 producer: Park Nelco N4000-6 (high-Tg multifunctional epoxy), not Isola 370HR Heats up and cools (diffusivity) 0.16 mm²/s Thermal shock resistance 324 W/m Glass transition 180 °C source typical, DSC (IPC-TM-650 2.4.25C) Max service temperature 130 °C source UL Relative Thermal Index (UL 796) Values for Isola 370HR FR-4 laminate (Polyclad PCL-FR-370HR, 180 C Tg multifunctional epoxy, E-glass fabric), copper removed; Isola data sheet Revision C, last updated April 15, 2021. Woven-glass laminate: the sheet gives in-plane values per weave direction (length / cross) and the Z-axis CTE separately; the solver is isotropic per material.
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