PCB Board FR-4, 2 copper planes vs. Plastic PPS GF40

Compare PCB Board FR-4, 2 copper planes vs. Plastic PPS GF40 strength, stiffness, weight and thermal properties.

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PCB Board FR-4, 2 copper planesComposite

Plastic PPS GF40Bulk polymer (molded or machined)

Mechanical
Try it on a partA sample part to run stress or thermal on, free in your browser	Open in LessCAD	Open in LessCAD
Yield strength	not given (tensile used)	not given (tensile used)
Ultimate tensile strength	246–385MPasourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction (ASTM D3039)	195MPasourcetensile strength, 5 mm/min
Flexural strength	not sourced	285MPasourceflexural strength at break
Elongation at break	not sourced	1.9%sourcestrain at break, 5 mm/min
Young's modulus (stiffness)	21.9–25.8GPasourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction (ASTM D790-15e2); the copper planes are left out	14.7GPasourcetypical, 1 mm/min
Density	not sourced	1,650kg/m³sourcetypical
Strength to weight	not sourced	118kN·m/kg
Stiffness to weight	not sourced	8.91MN·m/kg
Poisson's ratio	0.171–0.177sourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction	0.35sourceglass-reinforced Fortron PPS (class value, not grade-specific)
Shear modulus	10.2GPa1.87x stiffer in shear	5.44GPa
Bulk modulus	12.2GPa	16.3GPa
Speed of sound	not sourced	2,985m/s
Thermal
Thermal conductivity	not sourced	0.2W/m·Ksource40% glass-reinforced Fortron, 25 °C (not grade-specific)
Thermal expansion	13–14µm/m·Ksourcethe bare laminate's (fr4-370hr), in-plane X/Y-axis, below Tg (IPC-TM-650 2.4.24C)	12µm/m·Ksourceparallel (flow), mean -50 to 90 °C
100 mm part over a 50 °C swing	67.5µm growth	60µm growth12% less
Specific heat	not sourced	not sourced
Heats up and cools (diffusivity)	not sourced	not sourced
Thermal shock resistance	not sourced	144W/m
Melting point	not sourced	280°CsourceDSC, 10 °C/min
Glass transition	not sourced	90°CsourceDSC, 10 °C/min
Max service temperature	not sourced	270°CsourceHDT 1.8 MPa
Values for	A whole circuit board read as one orthotropic plate: the JEDEC high-K thermal test board (JESD51-7, "2s2p"), 0.062 in (1.575 mm) thick with two internal solid copper planes 0.0014 in (1 oz) thick, as Texas Instruments SZZA017A Table 1 gives it. Copper C110 and the Isola 370HR laminate from this library; the layers conduct in parallel along the board and in series through it (boardStackup.ts). Its two 0.0028 in trace layers cover little of the board and are left out; vias are ignored. Mechanical values are the bare laminate's.	Celanese Fortron 1140L4 (PPS, 40% glass fibre), injection moulding; FORTRON PPS Short-Term Properties Guide (PPS-012, 2016); thermal conductivity and Poisson for 40% glass-reinforced Fortron from the Fortron PPS Design Manual (PPS-050, 2013).

Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.

Questions

Is PCB Board FR-4, 2 copper planes stronger than Plastic PPS GF40?

PCB Board FR-4, 2 copper planes is stronger: its tensile strength is 315 MPa against 195 MPa for Plastic PPS GF40 (1.62x).

Which is stiffer, PCB Board FR-4, 2 copper planes or Plastic PPS GF40?

PCB Board FR-4, 2 copper planes is stiffer: Young's modulus 23.9 GPa against 14.7 GPa for Plastic PPS GF40, so the same part in PCB Board FR-4, 2 copper planes deflects less under the same load.

Which expands less with temperature?

Plastic PPS GF40 expands less: 12 µm/m·K against 13.5 µm/m·K for PCB Board FR-4, 2 copper planes.

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Stiffness against density

Strength against density