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PCB Board FR-4, 2 copper planes vs. Titanium

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

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PCB Board FR-4, 2 copper planesComposite
TitaniumWrought
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Mechanical
Yield strengthnot given (tensile used)885MPasourcetypical, plate (>0.187 in), annealed, 0.2% offset
Ultimate tensile strength246–385MPasourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction (ASTM D3039)940MPasourcetypical, plate, annealed
Elongation at breaknot sourced16%sourcetypical, in 2 in., plate annealed
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 out107–122GPasourcetypical range, 20 °C
Densitynot sourced4,430kg/m³sourcenominal
Strength to weightnot sourced200kN·m/kg
Stiffness to weightnot sourced25.8MN·m/kg
Poisson's ratio0.171–0.177sourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction0.342sourcemean of TIMET measurements
Shear modulus10.2GPa42.7GPa4.2x stiffer in shear
Bulk modulus12.2GPa121GPa
Speed of soundnot sourced5,084m/s
Thermal
Thermal conductivitynot sourced6.6W/m·Ksourcetypical, 20 °C, mill annealed
Thermal expansion13–14µm/m·Ksourcethe bare laminate's (fr4-370hr), in-plane X/Y-axis, below Tg (IPC-TM-650 2.4.24C)9µm/m·Ksourcetypical, mean 0-100 °C
100 mm part over a 50 °C swing67.5µm growth45µm growth1.5x less
Specific heatnot sourced580J/kg·Ksourcetypical, 20 °C
Heats up and cools (diffusivity)not sourced2.57mm²/s
Thermal shock resistancenot sourced3,730W/m
Melting pointnot sourced1,630–1,650°Csourcemelting range
Max service temperaturenot sourced400°Csourceupper recommended use temperature
Values forA 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.TIMETAL 6-4 (Ti-6Al-4V Grade 5) annealed plate typical (TIMET properties manual) + TIMET datasheet TMC-0150 physical properties

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 Titanium?

Titanium is stronger: its yield strength is 885 MPa against tensile strength 315 MPa for PCB Board FR-4, 2 copper planes (2.81x).

Which is stiffer, PCB Board FR-4, 2 copper planes or Titanium?

Titanium is stiffer: Young's modulus 115 GPa against 23.9 GPa for PCB Board FR-4, 2 copper planes, so the same part in Titanium deflects less under the same load.

Which expands less with temperature?

Titanium expands less: 9 µm/m·K against 13.5 µm/m·K for PCB Board FR-4, 2 copper planes.

Among 73 materials

1k10k0.1110100Density (kg/m³)Young's modulus (GPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonAluminumSteelIronSteel AISI 1018Stainless Steel 304Stainless Steel 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless Steel 303Stainless Steel 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic UHMWPEPlastic HDPEPlastic PolypropylenePlastic PMMAFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelPCB Laminate FR-4SiliconCeramic Alumina 96%Ceramic Aluminum NitrideAluminum A380Aluminum 6063-T6Aluminum 1100-OAluminum ADC12Magnesium AZ91DSolder SAC305Plastic PBT GF30Plastic PPS GF40Plastic LCP GF30Titanium
Stiffness against density
1k10k101001kDensity (kg/m³)Yield strength (MPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonRubberAluminumSteelIronSteel AISI 1018Stainless Steel 304Stainless Steel 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless Steel 303Stainless Steel 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic PTFEPlastic UHMWPEPlastic HDPEPlastic PolypropylenePlastic PMMAFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLA Resin Elastic 50ASLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelBrickPCB Laminate FR-4SiliconCeramic Alumina 96%Aluminum A380Aluminum 6063-T6Aluminum 1100-OAluminum ADC12Magnesium AZ91DSolder SAC305Plastic PBT GF30Plastic PPS GF40Plastic LCP GF30Titanium
Strength against density

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